CHANGELOG.md

Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

Unreleased (14.1.5)

Fixed

• The JSON renderer of the core plugin now understands a cluster to be indicated by the common rules, including the “cluster” prefix being case insensitive and the cluster=true attribute as an alternative. #2187
• The description of what defines a cluster subgraph in the gc man page has been updated. #2187
• When rendering multiple files at once (e.g. dot -Tsvg -O file1.dot file2.dot), page numbering state from previous jobs no longer leaks into the current job. This was a regression in Graphviz 2.40.0. #2827
• Logic to determine whether a rendered page is non-first has been corrected.

14.1.4 – 2026-03-20

Changed

• Enable ascii plugin to be built using autotools. #2828

Fixed

• Processing concentrate=true graphs no longer crashes Graphviz. Processing of concentrate=true graphs still often errors out. #2825

14.1.3 – 2026-03-02

Changed

• Using long node names in combination with the fdp layout algorithm no longer results in truncated generated names.
• Vertical centering of text within HTML-like table cells has been improved.
• The existing ability to provide a numeric parameter to -v to specify verbosity level are newly documented in dot --help.

Fixed

• gvmap no longer dereferences a null pointer when reading position-less graphs.
• gvmap no longer crashes when adding coordinate data.
• mm2gv no longer accepts input matrices with non-real element type. Previously these would be accepted but processed incorrectly leading to out-of-bounds memory reads and writes.
• The Tcldot_Init, Tcldot_builtin_Init, and Tcldot_SafeInit symbols in tcldot.dll are externally visible on Windows. #2809
• The Tclpathplan_Init and Tclpathplan_SafeInit symbols in tclpathplan.dll are externally visible on Windows. #2809
• The Autotools build system more consistently uses $PYTHON3 instead of python3 when invoking Python. This ensures developers are more easily able to control the Python installation in use from the top level.
• The Autotools build system explicitly links against libglu libraries when linking against libglut.
• Corrected time formatting in verbose info/debug messages (enabled by -v). Previously, minutes was missing, showing HH:SS instead of HH:MM:SS.
• Further parts of the network simplex algorithm have been rewritten in a non-recursive style. This allows processing larger graphs that previously caused stack overflows. #2782
• Canonicalizing an empty string or a string entirely made up of characters needing escaping no longer triggers an out-of-bounds memory write. This was a regression in Graphviz 13.0.1. #2743
• An off-by-one error in the network simplex algorithm has been corrected. This could have led to suboptimal layout in some edge cases. This was a regression in Graphviz 13.0.0.

14.1.2 – 2026-01-24

Changed

• Support for HP-UX has been removed.

Fixed

• On MinGW, Smyrna consistently uses / as a path separator.
• In the CMake build system, building a statically linked dot with the Quartz plugin enabled has been repaired.
• The configuration files exported by the CMake build system have an additional install interface of include, adding to the existing include/graphviz. The effect of this is that code using these files to access Graphviz headers can now prefix their include paths, e.g. #include <graphviz/gvc.h> instead of #include <gvc.h>. #2798
• The colorscheme attribute when applied to edge labels works once again. This was a regression in Graphviz 11.0.0. #2801
• The dpi and resolution graph attributes are now constrained to a minimum value of 0.0. This was already stated in the documentation but not enforced by the code.
• Compilation from source no longer fails on Solaris with symbol conflicts due to lock_t usage. #2802
• When compiling Graphviz from source, _FILE_OFFSET_BITS is set consistently in all compilation jobs. #2803

14.1.1 – 2025-12-13

Changed

• When seeding random number generators with time(NULL), the result of getpid() is no longer also mixed in. Previously this was the case on non-Windows platforms, impeding reproducibility and portability.

Fixed

• In the CMake build system, when WITH_SMYRNA is AUTO or unset, Smyrna enabling depends on the presence of Pangocairo.
• In the CMake build system, versions of dot with plugins built in are only linked against enabled plugins. #2795

14.1.0 – 2025-12-06

Added

• Added option neato -n3 for fit ends of edges to nodes' borders when edge trajectory is set. #2736
• Orthogonal edges now support rounded corners via the radius edge attribute. When splines=ortho is set and an edge has radius > 0, corners are rendered as smooth arcs instead of sharp angles. The radius value controls the size of the corner arc. Default is 0 (square corners).

Fixed

• Some Undefined Behavior in sparse matrix calculations has been removed.
• In the Autotools build system, when the PHP interpreter (php) is available but php-config is not, building the PHP bindings is no longer enabled. This was a regression in Graphviz 2.42.0. #2788

14.0.5 – 2025-11-28

Fixed

• When filtering attribute lists, Smyrna no longer accesses out of bounds memory or misses results.
• osage should now handle clusters that become empty when nodes are incorrectly assigned to sibling clusters. #2721

14.0.4 – 2025-11-15

Changed

• Internal timing operations now use clock() on all platforms (previously this was only used on Windows). This should result in more accurate timing in verbose informational messages.
• Building Graphviz with expat < 2.2.8 is no longer supported on MinGW.

Fixed

• diffimg now notices failures when calling Ghostscript to convert PS images to PNG and exits instead of continuing.
• dtstat no longer reads/writes out of bounds memory on platforms where sizeof(int) < sizeof(size_t). This was a regression in Graphviz 7.0.1.
• Some incorrect variable types in the libcdt man page have been corrected.
• gvgen no longer triggers Undefined Behavior when asked to generate a binary tree with depth ≥ 32 (e.g. gvgen -t32).
• gvgen no longer triggers Undefined Behavior when asked to generate a hypercube with depth ≥ 32 (e.g. gvgen -h32).
• A null pointer dereference in edge pair analysis within the circo algorithm has been fixed.

14.0.2 – 2025-10-19

Changed

• Quartz plugin code paths to support older macOS and iOS versions have been restored. Their removal was a regression in Graphviz 13.0.0.
• In the CMake build system, whether Quartz-dependent components are built or not can now be controlled by the -DWITH_QUARTZ={AUTO|ON|OFF} option.
• dot_builtins, when compiled with the CMake build system, now supports the Quartz plugin if it is enabled at build time.

Fixed

• Memory corruption when using the Java bindings to render to a string has been corrected. This was a regression in Graphviz 2.49.0.
• A minor typo in the gvpr(3) man page has been fixed.
• Calling gvpr(…, NULL) no longer causes null pointer dereferences.

14.0.1 – 2025-10-05

Changed

• The pre-built macOS package for Autotools is now a .pkg file instead of a tarball of binaries. #2726, !4348
• In the CMake build system, whether Ghostscript-dependent components are built or not can now be controlled by the -DWITH_GHOSTSCRIPT={AUTO|ON|OFF} option. #2735

Fixed

• Points generated as curves by the dot layout algorithm are once again placed correctly. This was a regression in Graphviz 14.0.0. #2734

14.0.0 – 2025-09-21

Changed

• In the CMake build system, whether GTK-dependent components are built or not can now be controlled by the -DWITH_GTK={AUTO|ON|OFF} option. #2714
• The CMake build system now includes man pages for the circo, dot2gxl, fdp, gv2gml, gv2gxl, gvmap.sh, gxl2dot, neato, sfdp, and twopi aliases. #1753, #2530
• In the CMake build system, whether Poppler-dependent components are built or not can now be controlled by the -DWITH_POPPLER={AUTO|ON|OFF} option. #2714
• The gvpr -a option is no longer limited to 100 arguments. It is limited now only by available memory.
• In the CMake build system, whether librsvg-dependent components are built or not can now be controlled by the -DWITH_RSVG={AUTO|ON|OFF} option. #2714
• In the CMake build system, whether libwebp-dependent components are built or not can now be controlled by the -DWITH_WEBP={AUTO|ON|OFF} option. #2714
• Breaking: The CDT_VERSION macro has been updated to reflect the last time an API-breaking change was made. This should have happened in Graphviz 9.0.0 and then multiple other releases since then. #2722
• In the CMake build system, whether X11-dependent components are built or not can now be controlled by the -DWITH_X={AUTO|ON|OFF} option. #2714
• The graphviz_version.h header includes macros GRAPHVIZ_VERSION_MAJOR, GRAPHVIZ_VERSION_MINOR, GRAPHVIZ_VERSION_PATCH for compile-time discrimination based on the Graphviz version. #2716
• The CMake build system no longer allows overriding the Graphviz version with -DVERSION=….
• Breaking: The agcanonStr function has been removed.

Fixed

• The CMake build system no longer installs an sfdp alias when SFDP is disabled (-Dwith_sfdp=OFF).
• The plugin version in pre-built Fedora and Rocky Linux packages has been corrected 6 → 8. This change should have happened in Graphviz 13.0.0.
• Empty HTML-like labels (<>) are once again processed successfully. This was a regression in Graphviz 13.0.0. #2727
• Some typos in the cgraph man page have been fixed.

13.1.2 – 2025-08-09

Changed

• DFLT_GVPRPATH, a $PATH-like variable that gvpr uses to locate user-referenced files, is now computed at runtime instead of build time. This removes a barrier to relocating a Graphviz installation from one directory to another.
• In the CMake build system, whether GDK-dependent components are built or not can now be controlled by the -DWITH_GDK={AUTO|ON|OFF} option. #2714

Fixed

• Gvedit and Smyrna on MinGW can now correctly locate their supporting runtime data directories.
• The gvpr options -v for printing verbose messages is documented. This has been supported since Graphviz 2.30 but undocumented.
• When using the CMake build system, DFLT_GVPRPATH is no longer incorrectly missing a ".:" prefix.
• On macOS, processing graphs involving URLs with the Quartz plugin is once again possible. Previously this would crash. This was a regression in Graphviz 13.0.1. #2712
• In gvpr, updating a map or deleting items from the map no longer triggers a use-after-free. #2707

13.1.1 – 2025-07-20

Changed

• When built with PangoCairo, the Kitty plugin is now available in Graphviz static builds. Previously it was only available in shared library (on-demand plugin loading) builds.
• The distributed Fedora and Rocky Linux packages now include the Kitty plugin. #2704
• On Windows, the GDI+ plugin is now available in Graphviz static builds. Previously it was only available in shared library (on-demand plugin loading) builds.
• Processing a graph with GVPR no longer makes explicit the default "\N" label for nodes. This undoes a change from Graphviz 13.0.1. #2705
• nop no longer preserves empty string labels. This undoes a change from Graphviz 13.0.1. #2436, #2705
• The order of programmatic calls to gvContext/gvContextPlugin and agmemread once again affects default node labels. This undoes a change from Graphviz 13.0.1. #2434, #2705

Fixed

• Spline routing can now deal with horizontal and vertical lines. This removes some instances of the “Something is probably seriously wrong” warning. #241
• Using layerselect beyond layer 1 no longer causes crashes. #1648
• Correct parsing of a PDF file’s /MediaBox section no longer depends on the internal BUFSIZ constant.
• Round tripping a graph through a file no longer causes it to acquire a default node label \N. #2705

13.1.0 – 2025-07-01

Added

• A new command line option, -Afoo=bar, serves as a shorthand way of writing -Gfoo=bar -Nfoo=bar -Efoo=bar. #2278

Fixed

• Inter-cluster edges are no longer spuriously duplicated. #162, #258, #2615
• When using the CMake build system, configuration no longer fails with syntax errors when PangoCairo is unavailable. This was a regression in Graphviz 13.0.0. #2697

13.0.1 – 2025-06-15

Changed

• When using the CMake build system, the minimum required version of CMake has been upgraded 3.14.1 → 3.21.
• Building Graphviz from source now requires a C compiler with ISO C17 support.
• Processing a graph with GVPR now makes explicit the default "\N" label for nodes.

Fixed

• Graphs with large weights no longer trigger double frees. #1494, #2331
• nop preserves empty string labels. #2436
• The order of programmatic calls to gvContext/gvContextPlugin and agmemread no longer affects default node labels. #2434
• Adjacency matrices are sparse and expanded on demand, removing out-of-bounds accesses when computing these for some graphs. #1472

13.0.0 – 2025-06-08

Added

• Support for building the SWIG-generated Ruby language bindings has been integrated into the CMake build system. This is controllable by the -DENABLE_RUBY={AUTO|ON|OFF} option.
• A new plugin for outputting ASCII art has been implemented, -Tascii. This relies on AA-lib and is only supported in the CMake build system. #2421
• In gvpr, a new function rename() has been added for nodes. See man gvpr for more information.

Changed

• If Quartz is enabled on macOS, the autotools build will include support for it as a built-in plugin for static builds, for dependency free i.e. PDF support.
• Improved agwrite so it is much faster (linear not quadratic) when there are many small subgraphs. #2593
• Breaking: rank_t.cache_nc is now a int64_t.
• Breaking: The agreadline function has been removed. #2558
• Breaking: gvRenderData takes its length parameter as a size_t *. The GVJ_t fields output_data_allocated and output_data_position have type size_t.
• The GRAPHVIZ_CLI variable in the CMake build system now additionally controls whether the utilities diffimg and prune are built.
• Breaking: The cgraph macros agnew and agnnew have been removed.
• Breaking: The cgraph functions agalloc, agrealloc, and agfree have been removed.
• Breaking: The cdt queue types, DT_QUEUE, Dtqueue, _Dtqueue have been removed.
• Breaking: The cdt aliases struct _dthold_s, struct _dtdata_s, struct _dtmethod_s, struct _dtstat_s have been removed.
• Breaking: The cdt type _Dttree has been removed.
• Breaking: The cdt aliases struct _dtlink_s, struct _dtdisc_s, and struct _dt_s have been renamed to struct dtlink_s_, struct dtdisc_s_, and struct dt_s_ respectively.
• Breaking: The cdt macro DT_PRIME has been removed.
• Breaking: The cdt field Dt_t.data is now a Dtdata_t instead of Dtdata_t *.
• Breaking: GVJ_t.imagedata is now an unsigned char *.
• The sandboxer implemented in Graphviz 12.2.1, dot_sandbox, supports macOS.
• The baseline version of Autoconf required to build Graphviz from source has been upgraded 2.61 → 2.69.
• Building Graphviz from source now requires a C compiler with ISO C11 support.
• GVPR programs are now able to print char and unsigned variables. #2587
• CMake projects using Graphviz as a subproject (add_subdirectory) can now link against and use cgraph, pathplan, and xdot.
• CMake projects using Graphviz as an installed third-party dependency can now discover its libraries with find_package(graphviz) and then use them as e.g. target_link_libraries(myapp PRIVATE graphviz::cgraph). #2598
• Verbose checkpath warnings about ports not lying in their expected boxes have been removed.
• In verbose mode (-v) the dot layout algorithm now notes when it is entering each layout phase. #2540
• Breaking: The EXPANDBP macro has been removed.
• Breaking: The EXPANDBB macro has been removed.
• Breaking: Agclos_t.strdict is now an opaque pointer.
• Breaking: agstrfree takes an extra parameter indicating whether the string being freed is an HTML-like string.
• Breaking: The agcanon function has been removed.
• Breaking: The Agiddisc_t.alloc member has been removed.
• Breaking: The cflag parameter to agidsubg has been removed.
• The CMake build system now installs libgvpr.
• The CMake build system now sets DFLT_GVPRPATH when compiling libgvpr.
• The CMake build system now installs the included library of gvpr programs.
• Breaking: The all parameter to exclose has been removed.
• MinGW on 32-bit x86 (“mingw32”) is no longer supported as a platform. Installers and release archives for this platform are no longer provided. #2649
• gvgen supports a new option, -u<seed>, for specifying the initial state of the random number generator (RNG). The way in which the RNG is seeded has slightly changed.
• Breaking: libcgraph’s SO name has been updated 6 → 7.
• The core plugin’s SVG output (-Tsvg, -Tsvg_inline) now sets xml:space="preserve" on text elements for more accurate display.
• Breaking: To duplicate strings, you now should distinguish between regular text strings and HTML-like strings. Regular text strings are handled through agstrdup_text and HTML-like strings are handled through agstrdup_html. The The agstrdup function has been retained for backwards compatibility, but should be avoided where possible due to its ambiguity with respect to the caller’s intent. Similarly for string binding, agstrbind has gained two variants agstrbind_text and agstrbind_html. These should be used in preference to agstrbind whenever possible. Similarly for attribute creation/lookup, agattr has gained two variants agattr_text and agattr_html. These should be used in preference to agattr whenever possible. Similarly for safe attribute creation/lookup, agsafeset has gained two variants agsafeset_text and agsafeset_html. These should be used in preference to agsafeset whenever possible. Similarly, agxset has gained two variants agxset_text and agxset_html. These should be used in preference to agxset whenever possible. Similarly, agset has gained two variants agset_text and agset_html. These should be used in preference to agset whenever possible. #2089, #2641
• Breaking: The EDGEOF macro has been removed.
• The Autotools build system enables large file support on 32-bit platforms.
• Breaking: The Graphviz plugin version has been updated 6 → 8. A side effect of this is the config6 file becoming config8.
• The core plugin’s SVG output (-Tsvg, -Tsvg_inline) uses a viewBox that matches the image’s dimensions. This reverts behavior introduced in Graphviz 2.38.0 to the behavior Graphviz 2.36.0 and prior had. The difference is most apparent when using a non-default dpi setting. #2669
• The Tcl bindings have been updated for compatibility with Tcl 9. #2668
• The SVG output format (-Tsvg, -Tsvg_inline) no longer duplicates font families.
• Breaking: The function aginternalmapclearlocalnames has been removed. #2664
• In gvpr programs, the # and in operators now work on ARGV. #2582
• Breaking: xdot_color_stop.frac is now a double.
• The GD plugin’s PNG output (-Tpng:cairo:gd) now sets DPI in the written PNG. #1617
• The GDI+ plugin’s output (-T*:cairo:gdiplus) now sets DPI in the written output. #1617
• The Quartz plugin’s PNG output (-Tpng:cairo:quartz) now sets DPI in the written PNG. #1617
• Breaking: The agconcat function now takes an extra filename parameter. If you are updating calling code, passing NULL for this parameter is a reasonable migration strategy.
• Breaking: The agsetfile function has been removed.
• The GDK plugin’s output (-T*:cairo:gdk) now sets DPI in written JPEGs and PNGs. #1617
• Breaking: The Agsym_t struct has gained a new member, owner.

Fixed

• Numeric overflows when computing the total crossings in a graph with a large number of crossings have been avoided. #2621
• A free of an invalid pointer has been fixed in the GD plugin. This was a regression in Graphviz 12.1.1.
• A double-free when using rotated images was fixed in the GD plugin. This was a regression in Graphviz 2.26.0.
• Guile 2.2 discovery has been restored in the Autotools build system. This was a regression in Graphviz 12.2.0. #2624
• Legacy information about memory disciplines has been removed from the cgraph man page.
• Some information in the gvc.3 man page that contradicted the gvc.h public header has been corrected.
• Smyrna is once again compilable on macOS. This was a regression in Graphviz 10.0.1. #2631
• non-HTML (regular) strings and HTML-like strings are no longer considered equivalent internally. This allows you to have a non-HTML string and an HTML-like string with the same textual content. #2089
• Smyrna no longer crashes when selecting Edit→Attributes with no open graph. #2635
• A bug in point map handling, where comparison of integer points were accessed as doubles, has been corrected. The user facing consequences of this is unknown, but could potentially lead to crashes, at least on 32-bit platforms. Point maps are used by the neato layout engine. This was a regression in Graphviz 12.0.0.
• The executables in the Windows 64-bit Debug release artifacts were statically linked, not dynamically linked like the 64-bit Release and all the 32-bit executables. This has now been corrected. This was a regression in Graphviz 12.0.0. #2630
• The viewBox attribute of an included SVG image no longer overrides the height and width attributes, even when it precedes them. This was a regression in Graphviz 2.30. #2636
• The interpretation of viewBox attributes in included SVG images has been corrected. #2636
• Parsing of JPEG images used as node shapes has been corrected. This fixes a problem where no or incorrectly sized images appeared in the output. Please note that a bug in the GD plugin, which causes Graphviz to crash in Windows Debug builds, now unfortunately seems to always occur when using the GD plugin and JPEG images as node shapes. See https://graphviz.org/docs/outputs/#image-formats for details. #2619
• twopi no longer crashes when processing graphs with splines="ortho". #2643
• Network simplex functions have been refactored to avoid recursion. Now graphs with deep node chains that previously caused stack overflows can be processed. #2646
• Calling the GVPR function lock with a second argument > 2³¹ - 1 is no longer misinterpreted as a negative number.
• Out-of-bounds accesses during gvgen random tree generation have been fixed. #2640
• gvmap no longer reads out-of-bounds memory when processing the -c_opacity=… command line option. This was a regression in Graphviz 2.49.0.
• Using rankdir=LR in combination with ltail no longer causes crashes in edge cases. #1949
• Using splines=curved no longer causes crashes when cut points unexpectedly do not intersect bounding boxes. #1453
• In the CMake build system, the configuration step during installation (dot -c) now anticipates that $LD_LIBRARY_PATH and $DYLD_LIBRARY_PATH may be non-empty. #2676
• Failures during installing nodes into ranks now results in a graceful exit rather than referencing invalid memory. #1581
• When using the Tcl bindings, deleting a graph no longer triggers a use-after-free. This was a regression in Graphviz 2.30. #2618
• The layout command in the Tcl bindings works once again. This was a regression in Graphviz 2.42.0. #2618
• In the CMake build system, configuring with -DENABLE_PYTHON=ON -DENABLE_SWIG=ON no longer spuriously fails. #2675
• An assertion failure when processing graphs with empty ranks has been fixed. #1514
• Using GVPR to set a default attribute on a subgraph whose root graph has no default for that attribute no longer incorrectly sets the default on the root graph. #2639
• Mingle no longer crashes when doing Y coordinate search. This was a regression in Graphviz 2.47.0. #2599
• Smyrna no longer frees invalid pointers when processing xdot input. This was a regression in Graphviz 2.50.0. #2687
• Smyrna no longer crashes when processing xdot gradient colors or font characters. This was a regression in Graphviz 2.34.0.

12.2.1 – 2024-12-07

Added

• Support for building the SWIG-generated R language bindings has been integrated into the CMake build system. This is controllable by the -DENABLE_R={AUTO|ON|OFF} option.
• A sandboxing wrapper, dot_sandbox, is now included with Graphviz. Users should prefer their platform’s native security solutions, but if nothing better is available this wrapper offers safe processing of untrusted inputs in some scenarios.

Changed

• JPEG images without an APP0 leading segment are supported for use in src fields and friends. Previously Graphviz was overly strict with the types of JPEGs it would recognize. #2619
• The CMake build system now discovers and uses pango_fc_font_lock_face if possible, for the Pango plugin to provide more information about used fonts.

Fixed

• The GVPR library program depath no longer acts on previously deleted nodes, causing unpredictable results. #1702
• Void-typed function parameters (int foo(void bar)) and variables void baz; in GVPR are gracefully rejected. #2585
• Input that induce a set node height but no set node width no longer crash with the failure “Assertion failed: (r->boundary[i] <= r->boundary[NUMDIMS + i]), function RTreeInsert”. It is typically not obvious to users when their input falls into this situation, hence why the assertion message is quoted here. This was a regression in Graphviz 12.0.0. #2613
• Strings containing double quote characters preceded by escape sequences (e.g. \n") are once again correctly escaped in dot or canonical output. This was a regression in Graphviz 9.0.0. #2614
• dot_builtins no longer lists duplicate format options in its error messages. #2604
• A precision error that resulted in truncated edge lines has been corrected. This was a regression in Graphviz 12.0.0. #2620
• The xlib plugin (-Tx11) resets its initialization state during finalization. This fixes a rare scenario where multiple input graphs are supplied and initialization for one of the not-first graphs fails. In this scenario, finalization would be unaware of this failure and act on invalid state.

12.2.0 – 2024-11-04

Removed

• Visual Studio build files have been removed. CMake is now the only supported build system on Windows.

Added

• Support for building the SWIG-generated PHP language bindings has been integrated into the CMake build system. This is controllable by the -DENABLE_PHP={AUTO|ON|OFF} option.
• Support for building the SWIG-generated Python language bindings has been integrated into the CMake build system. This is controllable by the -DENABLE_PYTHON={AUTO|ON|OFF} option.

Changed

• An algorithm closer to that described in RFC 1942 and/or the CSS 2.1 specification is now used for sizing table cells within HTML-like labels. This is less scalable than the network simplex algorithm it replaces, but in general produces more intuitive results. #2159
• Tooltips on table elements within HTML-like labels are now propagated to SVGs produced by the core plugin (-Tsvg) even when the elements do not have href attributes. #1425
• In the Autotools build system, pkg-config is the only supported way for discovering Guile. Previous use of guile-config* has been removed. #2606
• The Autotools release artifacts for macOS (Darwin_*_graphviz-*.tar.gz) now use relative paths in links to dependent libraries and plugins. This should make the tree relocatable instead of having to live at /Users/gitlab/builds. #2501
• gml2gv no longer maps GML label attributes to Graphviz name attributes. These are now mapped to Graphviz label attributes. #2586

Fixed

• In the Autotools build system, the core plugin links against libm, fixing some unresolvable symbols. This was a regression in Graphviz 4.0.0. Though it would primarily have affected non-Graphviz applications attempting to load this plugin on Linux.
• The osage layout engine now understands a cluster to be indicated by the common rules, including the “cluster” prefix being case insensitive and the cluster=true attribute as an alternative. #2187
• acyclic once again produces its output on stdout. This was a regression in Graphviz 10.0.1. #2600
• When using the Tclpathplan module, created vgpanes can once again be named and addressed. This was a regression in Graphviz 12.1.2.
• Omitting a polygon identifier when running triangulation using the Tclpathplan module (e.g. vgpane0 triangulate instead of vgpane0 triangulate 42) no longer goes unnoticed and reads invalid memory. This bug seems to have existed since the first revision of Graphviz.
• When using the Tclpathplan module, defining a malformed <3-point polygon and then attempting to triangulate this polygon no longer reads invalid memory. This case is now rejected with an error during triangulation. Like the previous entry, this bug seems to have existed since the first revision of Graphviz.
• When using the Tclpathplan module, binding a pane’s triangulation callback to a string ending in a trailing % (e.g. vgpane0 bind triangle %) no longer causes later out-of-bounds reads during triangulation. Like the previous entries, this bug seems to have existed since the first revision of Graphviz. #2596
• Mouse right-clicks in Smyrna are no longer sticky. In some contexts, right-clicking the mouse would register a mouse down event but no mouse up event, leading Smyrna to believe the user was dragging with the right button held down.
• Arrowhead missing from tail-end of edge #2437
• The Ruby bindings package (libgv-ruby) is once again installable on Ubuntu. This became uninstallable when Ruby 1.8 was no longer available on Ubuntu, as it had a hard coded dependency of Ruby 1.8. This has now been relaxed to depend on any Ruby version ≥ 1.8. #2607
• Generated GIFs and JPEGs display the graphed image instead of a single solid color. This was a regression in Graphviz 12.1.1. #2609
• The CMake build system includes some supporting pieces of the SWIG-generated language bindings that were previously missing. It also links further dependencies that were previously missing.
• In the CMake build system, linking of the Guile language bindings uses the full path to libguile, fixing issues on macOS.
• The provided release packages for Debian-based operating systems (only Ubuntu currently) have corrected package dependencies. #2466
• Discussion of gvpr -c "" in the gvpr man page has been removed. This invocation did not do what was claimed. #2584

12.1.2 – 2024-09-28

Changed

• In the Autotools build system, the rsvg plugin is no longer built when pangocairo is missing. Previously, when librsvg was found but pangocairo was not, this plugin would be enabled and built but offer no functionality.
• The RSVG plugin now requires librsvg ≥ 2.42.7.
• The RSVG plugin uses newer librsvg APIs where available. #2206

Fixed

• In the Autotools build system, fallback discovery of libANN when pkg-config support is unavailable has been corrected to properly enable use of libANN. This primarily affects mingle users on Debian-based operating systems or macOS.
• The RSVG plugin no longer dereferences a null pointer when failing to create new RSVG handles.
• The Pango plugin no longer assumes a little endian environment when loading PS images.
• Deleting a “vgpane” when using the Tclpathplan module no longer frees an invalid pointer. This bug appears to have existed since the first revision of Graphviz. That is, deleting a “vgpane” has always crashed the TCL interpreter or silently corrupted the heap prior to this release.

12.1.1 – 2024-09-09

Added

• Support for building the SWIG-generated Guile language bindings has been integrated into the CMake build system. This is controllable by the -DENABLE_GUILE={AUTO|ON|OFF} option.
• Support for building the SWIG-generated Java language bindings has been integrated into the CMake build system. This is controllable by the -DENABLE_JAVA={AUTO|ON|OFF} option.
• Support for building the SWIG-generated Lua language bindings has been integrated into the CMake build system. This is controllable by the -DENABLE_LUA={AUTO|ON|OFF} option.
• Support for building the SWIG-generated Perl language bindings has been integrated into the CMake build system. This is controllable by the -DENABLE_PERL={AUTO|ON|OFF} option.

Changed

• Comparison against a plugin’s knowncolors array is now case-insensitive, rather than requiring all entries of the array to be lower-cased. The requirement that the knowncolors array is lexically ordered remains.
• The Smyrna “Color Theme”, “Edge Attr. For Color”, and “Node Alpha” settings have been removed. The values of these settings had no effect.
• Graphviz libraries set close-on-exec on job output files being written and user shape files being read. This should only affect applications using Graphviz libraries that rely on a fork-and-exec-ed child subprocess being able to access these open files. Applications with this requirement can regain the old behavior by unsetting the close-on-exec flag immediately after creating these objects. Graphviz libraries themselves are not affected by whether or not this flag is set.
• The Autotools build system no longer detects or uses the -perl option to SWIG to build Perl language bindings. Only -perl5 is used.

Fixed

• A reference to the non-existent colxlate function in an error message has been corrected to colorxlate.
• gvgen no longer crashes sometimes when running random graph generation. This was a regression in Graphviz 12.0.0. #2588
• Dashed and dotted pen styles in VRML images loaded by the GD plugin have been corrected.
• mm2gv no longer crashes when reading various types of malformed Matrix Market files.
• The edgepaint --color_scheme command-line option is once again functional. This was a regression in Graphviz 2.49.0. #2591
• An incorrect deallocation call during OpenGL texture construction failure has been corrected. This could previously have caused crashes or heap corruption. This was a regression in Graphviz 2.26.0.
• The CMake build on Windows no longer fails if TCL is detected. This was technically a regression in 12.0.0 since building the Graphviz TCL bindings was integrated into the CMake build system in that release. #2581
• When its output file cannot be opened, edgepaint no longer dereferences a null pointer when printing its error message.

12.1.0 – 2024-08-12

Added

• Enable the GNU Triangulated Surface Library (GTS) in Windows builds. #2557
• dot_builtins now also includes the vt plugin (-Tvt output format).
• The vt plugin gained new output formats, -Tvt-4up, -Tvt-6up, and -Tvt-8up, for drawing monochrome 4-, 6-, and 8-pixel-per-character visualizations, respectively.
• The CMake build system now includes the WebP plugin also on Windows.
• A Windows x64 mingle binary is now built with CMake.
• Support for building the SWIG-generated D language bindings has been integrated into the CMake build system. This is controllable by the -DENABLE_D={AUTO|ON|OFF} option.
• Support for building the SWIG-generated Go language bindings has been integrated into the CMake build system. This is controllable by the -DENABLE_GO={AUTO|ON|OFF} option. The target integer size can be set with -DINTGOSIZE=… if it is not auto-detected correctly.
• Support for building the SWIG-generated JavaScript language bindings has been integrated into the CMake build system. This is controllable by the -DENABLE_JAVASCRIPT={AUTO|ON|OFF} option.

Changed

• The GTK plugin, for which build system support was removed in Graphviz 10.0.1, has been removed from the portable source tarball. #1848
• To build from source, the required C++ standard has been upgraded from C++11 to C++17. #2536
• Breaking: the CMake variables enable_ltdl, with_expat, with_gvedit, with_smyrna, with_zlib, enable_tcl, enable_swig and enable_sharp have been renamed to ENABLE_LTDL, WITH_EXPAT, WITH_GVEDIT, WITH_SMYRNA, WITH_ZLIB, ENABLE_TCL, ENABLE_SWIG and ENABLE_SHARP, respectively.
• To build from source, the required Python version has been upgraded from 3.6 to 3.8. #2549
• Build system discovery of GDK now looks for GDK 3.0 instead of GDK 2.0. #1848
• Visual Studio build files are no longer distributed in the portable source tarball. Builds on Windows must now use a repository clone.

Fixed

• ccomps, gc, the fdp layout engine, the neato layout engine, and the patchwork algorithm now understand a cluster to be indicated by the common rules, including the “cluster” prefix being case insensitive and the cluster=true attribute as an alternative. #2187
• overlap values whose prefixes are themselves valid values (e.g. overlap=scalexy where overlap=scale is also a valid setting) are once again usable. Previously such values would silently select the shortest valid prefix. This was a regression in Graphviz 2.24.0. #2563
• Setting overlap=ortho_xy no longer also runs the constraint pass of overlap=porthoxy. Setting overlap=ortho no longer also runs the constraint passes of overlap=ortho_xy and ortho=porthoxy. This bug has existed ever since these overlap modes were introduced in Graphviz 2.4. However its effect was masked by the bug discussed in the prior CHANGELOG entry that made it not possible to select overlap=ortho_xy or overlap=porthoxy.
• splines = true merging multiedges together when using the neato engine. #2241 (fixed on Windows by enabling GTS)
• The GVC output writing APIs handle writes of compressed data > UINT_MAX more correctly.
• GVPR casts of strings to floats now produce the expected values. This was a regression in Graphviz 2.30.
• CMake builds do not support format png:gd #1786
• The diffimg utility is not built in CMake builds #1788 (fixed also for Windows x64 builds)
• The Windows x86 mingle binary built with CMake no longer fails to start because of missing ANN.dll.
• The node and edge tags printed by the TK output format (-Ttk) are once again usable for later referencing those same nodes and edges in TCL scripting. This was likely broken in the transition from 32-bit to 64-bit hardware. #2568
• Ubuntu 24.04 binaries incorrectly are ASan enabled and produce memory leak errors. #2574
• gvpr’s ability to handle empty string parameters to printf (e.g. printf("hello%s world", "")) has been restored. This was a regression in Graphviz 9.0.0. #2577
• pkgIndex.tcl for the TCL bindings is constructed based on target system properties instead of host system properties. Previously, cross-compilation would result in potentially incorrect library loading directives in this file.
• The Autotools build system no longer checks for the presence of php.h, which previously caused spurious failures when trying to build the PHP bindings with PHP 8.3. #2589
• A gvmap crash due to out-of-bounds memory writes has been fixed. This was a regression in Graphviz 8.0.1.

12.0.0 – 2024-07-04

Added

• Support for building the Graphviz TCL bindings has been integrated into the CMake build system. This is controllable by the -Denable_tcl={AUTO|ON|OFF} option.
• Support for building the SWIG-generated TCL language bindings has been integrated into the CMake build system. This is controllable by the -Denable_swig={AUTO|ON|OFF} option.
• Support for building the SWIG-generated C# language bindings has been integrated into the CMake build system. This is controllable by the -Denable_sharp={AUTO|ON|OFF} option.

Changed

• The Catch2-based test suite in the CMake build system has been ported from Catch2 v2 to Catch2 v3. Support for Catch2 v2 has been removed. #2465
• The Windows release artifacts are now built on Windows 2022 and Visual Studio 2022 17 and toolset v143.
• The macOS release artifacts are now built on macOS 13 (Ventura).
• The CMake build system no longer links dot_builtins against libsocket.
• The CMake build system now only compiles dot_builtins if building shared libraries (-DBUILD_SHARED_LIBS=ON).
• Breaking: the polygon_t.style member is now a struct.
• Breaking: the LEN and MAXDOUBLE constants have been removed.
• Accuracy in processing compass points has been improved.
• Breaking: the CMYK_BYTE member of the color_type_t enum and the corresponding gvolor_t.u.cmyk field have been removed. The color format this mapped to was neither documented nor implemented correctly.
• The Windows releases available for download on graphviz.org now only include CMake-produced packages, not MS Build-produced packages. The MS Build packages are available in the Gitlab package registry if needed.
• The CMake build system more pervasively sets rpaths of compiled binaries, libraries, and plugins, which should result in them more reliably finding their supporting components. without $LD_LIBRARY_PATH/$DYLD_LIBRARY_PATH tricks.
• Breaking: the Agraph_t.n_id field is now an opaque pointer.
• Breaking: the libpack functions putGraphs, putRects, and shiftGraphs now operate on floating-point points (pointf) instead of integer points (point).
• Breaking: the BF2B macro has been removed.
• Breaking: the undocumented -Tmp output format has been removed.
• Breaking: the arith.h header defines neither _GNU_SOURCE nor sincos any more. None of the build systems attempt to discover sincos any more.
• The FIG output format (-Tfig) supports up to 512 custom colors. The previous limit was 256, after which it would crash (see note in the “Fixed” section).
• Breaking: The TCL binding’s tcldot_layout function no longer tries to fallback to the dot layout engine if the requested engine is unavailable but instead fails with an error message.
• The TCL binding’s graph render command no longer ignores layout errors.
• The TCL binding’s graph write command now does layout unconditionally, regardless of what output renderer is selected.
• The CMake build system builds cgraph++ and gvc++ as either shared or static libraries, respecting the BUILD_SHARED_LIBS setting.
• Discovery of the fcntl.h header has been removed from all build systems. This header is now unconditionally assumed to exist.
• Breaking: obj_state_t.gradient_frac is now a double.
• Breaking: path.nbox is now a size_t.
• The change described as “Some routesplines miscalculations that led to lost edges and fatal errors have been avoided” in 11.0.0 has been reverted. The fix for this caused other problems.
• Breaking: the d and disc parameters have been removed from Dtcompar_f.
• CentOS packages are no longer provided.
• In the CMake build system, the minimum required CMake version has been increased to 3.14.1.
• Breaking: the disc parameter has been removed from Dtfree_f.
• Gvedit no longer depends on the getopt library.

Fixed

• The CMake build system now uses absolute paths to PangoCairo libraries during linking, resolving build problems on macOS.
• The CMake build system’s path for third-party headers for the DevIL plugin has been corrected.
• Edges not rendering properly when using ports and the crow arrowhead/tail with Windows Release builds. #2490
• A duplicate prototype of aghtmlstr has been removed.
• agrelabel_node (or equivalently, agrename when operating on a node) no longer corrupts the node-by-id set, causing a crash. This bug was preventing gxl2gv from processing inputs that used node name attributes. #2300
• Accuracy improvements have fixed an assertion failure on macOS. #2538
• The FIG output format (-Tfig) no longer crashes when handling more than 256 colors.
• The scale operation implemented by the TCL binding’s tclpathplan scales relative to the center of the points being scaled instead of reading uninitialized memory.
• The xlib plugin sets “close-on-exec” on the file descriptors it creates, preventing them leaking into either web browsers it starts or other processes created by the hosting application.
• A sign confusion issue in neatogen’s weighting calculations was fixed. This was a regression in Graphviz 11.0.0.
• The CMake build system no longer attaches dllimport/dllexport annotations when compiling static libraries on Windows and MinGW.
• An issue with linking gvpack when building static libraries in the CMake build system was fixed.
• An sfdp use-after-free issue was fixed. #2556
• Using concentrate=true once again works. This was a regression in Graphviz 11.0.0. #2559
• overlap="scale" no longer causes nodes to be placed on top of one another. This was a regression in Graphviz 7.0.5. #2564
• libpack code now understands a cluster to be indicated by the common rules, including the “cluster” prefix being case insensitive and the cluster=true attribute as an alternative. #2187, #2555

11.0.0 – 2024-04-28

Added

• gv2gml gained a -y option to output the yWorks.com variant of GML instead of the default.
• A new command line option, --filepath=… has been added to perform the function previously served by the $GV_FILE_PATH environment variable, use of which was removed in Graphviz 6.0.1. Unlike the old $GV_FILE_PATH mechanism, --filepath=… takes effect regardless of the setting of the $SERVER_NAME environment variable. #2396

Changed

• gvpack, in addition to recognizing a “cluster” name prefix as a mark of a cluster, now recognizes this case insensitively as well as recognizing the cluster attribute. This is more consistent with how the Graphviz libraries work.
• Breaking: pkg-config (.pc) files shipped with Graphviz now include ${prefix}/include in the include path in addition to ${prefix}/include/graphviz. Previously this missing path meant building Graphviz demo examples against an installation of Graphviz in a non-system path would not work. #2474
• The core PostScript output format (-Tps) warns if using an out-of-specification font name. To avoid this, use a more sophisticated output format like Cairo (-Tps:cairo) that does font name lookup and translation. #218
• Breaking: The libpack functions putRects, packRects, putGraphs, packGraphs, packSubgraphs, pack_graph, shiftGraphs, ccomps, cccomps, and pccomps now take the number of items they are operating on (ng) as a size_t.
• Breaking: The bsearch_cmpf and qsort_cmpf typedefs have been removed.
• dot -c -v, when constructing the config6 file, includes comments explaining any attempted actions that failed during plugin loading. #2456
• Breaking: The Ndim global is now a unsigned short.
• fdpgen no longer truncates graph names when inferring new names for connected component subgraphs.
• Breaking: The nodequeue type has been removed.
• Breaking: The field Agraphinfo_t.n_nodes has been removed. The function agnnodes is a more robust way of retrieving the number of nodes.
• The -q command line option will now suppress “no hard-coded metrics…” and other font lookup warnings. #2379
• Breaking: The CMP and SGN macros have been removed.
• The CMake build system no longer early-binds all enabled plugins into dot/dot.exe. This early binding was a change introduced in 10.0.1, but was not noted in this changelog. Traditionally, of the three Graphviz build systems (Autotools, CMake, MS Build), only changes to the Autotools build system were noted in this changelog under the assumption that packaging ecosystems making use of the other two build systems would need finer grained details and would be monitoring the Git commit history instead. This seems to not be the case, so in future side-effecting changes to any of the three build systems will be included here. #2527, #2528
• The precision of sep- and esep-based calculations has been improved.
• Breaking: Defines AGRAPH, AGNODE, AGOUTEDGE, AGINEDGE, and AGEDGE are replaced with enum.
• Breaking: The obj_state_t.url_bsplinemap_poly_n field is now a size_t and the obj_state_t.url_bsplinemap_n field is now a size_t *.
• Breaking: The Ppoly_t.pn (Ppolyline_t.pn) field is now a size_t.
• Breaking: The Proutespline function takes its n_barriers parameter as a size_t.
• Breaking: The gvattr_t type and the GVJ_t.selected_obj_attributes and GVJ_t.selected_obj_type_name fields have been removed.
• Breaking: The gv_argvlist_t type and functions that operate on it have been removed.
• Control characters in some error messages are escaped, preventing certain types of text injection that could cause user confusion.
• Breaking: GVJ_t.numkeys is a size_t.

Fixed

• Indexing within gvNextInputGraph no longer incorrectly retains the index from prior use of the GVC context. When using Graphviz libraries programmatically, this could previously cause crashes or misbehavior. #2484
• Color schemes, typically controlled through the colorscheme attribute are now pushed and popped as they are applied and released. Previously processing multiple graphs wherein the first uses color schemes but later ones do not could result in color schemes being incorrectly retained and reapplied or use-after-free memory accesses.
• The GDI+ plugin, when asked to render a graphic metafile, no longer references uninitialized memory. This bug was introduced in Graphviz 2.24.0.
• A free of an invalid pointer in edgepaint was fixed. #2513
• gvmap no longer references uninitialized variables when trying to process triangles and encountering only 2 points.
• Using the point shape in combination with peripheries=0 no longer causes out of bounds memory writes. This was a regression in Graphviz 7.0.0. #2497
• Unsafe use of a dangling pointer in ccomps has been removed. This was a regression in Graphviz 7.1.0.
• gvcolor no longer crashes when processing color names longer than 127 characters.
• Interleaving calls to colorxlate and gvrender_resolve_color no longer confuse internal caching mechanisms. Callers should now get the correct color back.
• The nop2 layout engine provided by the neato layout plugin is now equivalent to neato -n2 as intended instead of mistakenly being equivalent to nop/nop1/neato -n1.
• An off-by-one error in rank installation was corrected. Previously, an unusual rank=same constraint could cause a crash when installing ranks. #1308
• gxl2gv no longer crashes or misbehaves when symlinked to a non-ASCII file name. This is a rare scenario that normal users should not encounter.
• mm2gv no longer crashes or misbehaves when reading malformed Matrix Market files with non-ASCII bytes in the header.
• A stack buffer overflow in mm2gv when processing malformed Matrix Market files has been fixed.
• The newrank attribute is treated as a boolean instead of any value (including "false") being coerced into "true". #2521
• Crashes and misbehavior no longer occur when the sides attribute contains non-ASCII characters.
• Graphviz binaries like dot.exe and neato.exe no longer crash or misbehave when symlinked to a non-ASCII file name on Windows. This is a rare scenario that normal users should not encounter.
• GVPR programs that use tolower or toupper on strings containing non-ASCII characters no longer crash. These functions do not lowercase/uppercase non-ASCII characters, so users probably still do not want to use non-ASCII strings in a GVPR program.
• Some routesplines miscalculations that led to lost edges and fatal errors have been avoided. #2368
• An inaccuracy involving an edge case when constructing lines within libpack has been corrected.
• A bug in the internal heap implementation used in the network simplex algorithm has been corrected. This would previously cause certain runs to infer incorrect ordering or subtrees. This was a regression in Graphviz 2.40.0. #2391, #2529
• Compass points may be more accurately placed on the node boundary in some cases.
• A very small random adjustment in the calculation of the space available for edge routing around ellipse shaped nodes in fdp and neato layouts, has been removed.
• Incorrect edge splines for ellipse shaped nodes with ports using fdp or neato. #2168
• Incorrect edge splines for ellipse and polygon shaped nodes with ports and large penwidths using fdp or neato, causing the same symptoms as #2168.
• Incorrect edge splines for polygon shaped nodes with ports more than one periphery using fdp or neato, causing the same symptoms as #2168.
• Adjust the space available for edge routing based on penwidth when using fdp or neato and splines=ortho.
• Setting "mindist" graph attribute for circo layout causes GraphViz library to crash with "access violation in cgraph.dll" on gvLayout (checked for Windows only). #2356

10.0.1 – 2024-02-11

Added

• Releases now include packages for Rocky Linux 8 and 9.
• A new output format, -Tsvg_inline, has been added to generate a header-less SVG suitable for inlining into HTML. #2285
• The functionality of the acyclic, tred and unflatten command line tools are now exposed via the graphviz_acyclic, graphviz_tred and graphviz_unflatten API functions in libcgraph. #2194
• graphviz_node_induce is available as a new API function in cgraph.h.
• tred gained a -o command line option to redirect its output to a file.

Changed

• The Criterion unit tests have been removed and migrated to Pytest. This is primarily relevant to downstream packagers of Graphviz. #2443
• Breaking: Dtdisc_t.memoryf and its associated macros has been removed.
• Breaking: The Dt_t.type field has been removed.
• Breaking: The dtfound, DT_FOUND, dtleast, and dtmost macros have been removed.
• The nrtmain.c test program has been removed from the portable tarball.
• The TCL Graphviz packages for inter-release versions/snapshots report themselves as <next release>b<internal number> instead of <next release>~dev.<internal number>. This fixes a problem wherein TCL would see ~dev as being invalid characters to appear in a version. #2370
• Support for discovering Lua via lua-config* has been removed from the Autotools build system.
• Lua discovery in the Autotools build system should now respect the location of your Lua installation and not unconditionally attempt installation into /usr. #2152
• The GTK plugin is no longer built or distributed. This plugin relies on GTK 2 and X11. If you use this plugin, please contact the maintainers to let them know it is worthwhile re-enabling this and forward porting it to GTK 3/4 and Wayland. #1848
• In the Autotools build system, LIBPOSTFIX= can now be used to suppress 64 being appended to the library installation path.
• The -m command line option, whose functionality was disabled in Graphviz 3.0.0, has been removed.
• Man page typography has been slightly improved.
• macOS release artifacts no longer include vimdot. This may be restored in future. #2423
• macOS release artifacts no longer include smyrna. This may be restored in future. #2422
• The PDF output format, -Tpdf, respects the environment variable $SOURCE_DATE_EPOCH for overriding CreationDate when built against Cairo ≥ 1.16.0. #2473
• The legacy C# viewer app is no longer distributed in the portable source tarball.
• Graphviz headers no longer define the FALSE and TRUE constants.
• The Autotools build system no longer supports Darwin 9 (Mac OSX Leopard).
• Breaking: Agraph_t.link has been split into Agraph_t.id_link and Agraph_t.seq_link. Agraph_t.g_dict has been split into Agraph_t.g_id and Agraph_t.g_seq.
• Breaking: gvpropts.n_outgraphs is now a size_t.
• The OCaml bindings have been removed. If you use these bindings, please contact the maintainers to notify them of the existence of users.
• Breaking: polygon_t.sides and polygon_t.peripheries are now size_ts.
• Breaking: liblab_gamut is no longer included in a Graphviz installation. This library had no accompanying header, so using it was not easy. If you are using this library, please contact the maintainers to notify them of the existence of users. #2489
• Breaking: bezier.size and splines.size are now size_ts.
• Breaking: the gv.i and gv.cpp SWIG inputs are no longer included in a Graphviz installation. #2491
• Breaking: the gvrender_engine_t.beziercurve, gvrender_engine_t.library_shape, gvrender_engine_t.polygon, and gvrender_engine_t.polyline callbacks now take the number of points, n, as a size_t.
• Breaking: the AVG macro has been removed.
• Breaking: the inside_t.s union member gained members lastn, radius, last_poly, last, outp, scalex, scaley, box_URx, and box_URy. Zero initialize these when you construct instances of this type. #2498

Fixed

• The paper size for Doxygen docs generation in the Autotools build system has been corrected to a4.
• References to eventf and hashf data structures in the libcdt man page have been removed. These data structures were removed in Graphviz 9.0.0.
• References to DTOFFSET in the libcdt man page have been removed. This macro was removed in Graphviz 2.40.0.
• A number of further updates to the libcdt man page have been made to reflect other changes that happened in Graphviz 9.0.0.
• Use of the non-portable PATH_MAX constant has been removed. This was a regression in Graphviz 7.0.1. In addition to fixing the regression, code has been adjusted to remove assumptions on the maximum path length and treat it as unbounded. #2452
• Compilation on NetBSD has been repaired. This was a regression in Graphviz 9.0.0.
• Compilation on SunOS has been repaired. This appears to have been broken since the xlib plugin was added some time prior to Graphviz 2.38.0.
• gvpr programs that attempt to close out of range file descriptors no longer cause out of bounds memory accesses.
• When large edge weights are used that cause an integer overflow when summing them up, Graphviz now gracefully exits with an error message instead of crashing. #2450
• Support for the %n specifier in scanf in gvpr has been restored. This was a regression in Graphviz 9.0.0. #2454
• In the Autotools build system, make dist now processes cmd/gvedit correctly when Qt is not installed. Generating Qt “mocables” is postponed from configure time to build time. #2463
• The Autotools build system correctly detects Ruby headers, even when pkg-config support is unavailable. #2464
• Escaped characters in xdot fields no longer lead to the containing text being truncated. #2460
• When building against a libgd that is configured with !gif && (jpeg || png), the GD plugin is once again compilable. This was a regression in Graphviz 2.46.0.
• edgepaint spline intersection code would previously incorrectly use the second spline in one instance where it should have used the first. #1464
• In the Autotools build, libexpat discovery on macOS has been improved. #2477
• A bug that caused compound edges to sometimes be drawn in the wrong direction has been corrected. This was a regression in Graphviz 8.0.3. #2478
• When operating on multiple graphs, unflatten no longer retains chain node and size internal state across graphs.
• Repeated runs of a graph with subgraphs now produce a stable subgraph ordering. #2242
• The dot and gml2gv tools are now built with case-insensitive parsing by the CMake and MSBuild systems, as they always were by autotools, and in accordance with the graphviz specification. #2481
• Putting nodes in a subgraph no longer causes their layout order to be reversed. #1585
• Edges are no longer lost when using subgraphs and record shapes in combination. #1624
• A malformed config6 file that leads to plugin search failing no longer causes out-of-bounds memory reads. This now causes an error message and graceful failure. #2441
• Discovery of php in the Autotools build system has been improved.
• Text in the PIC output format is no longer forced to font size 1. This was a regression in Graphviz 8.0.2. Even with this fix, the PIC output format is limited in its utility. #2487
• When encountering a syntactically invalid HTML-like label, Graphviz.app no longer aborts. The abort was an intentional change in Graphviz 8.0.1 to avoid invalid memory reads in dot, but had the undesirable side effect of the graphical Graphviz.app exiting with no obvious cause. #2488
• Use of an uninitialized variable in poly_inside has been corrected. #2498
• Input containing UTF-8 data that is destined to appear as-is in the output (e.g. UTF-8 characters in a label when using the -Tdot output format) is once again processed correctly. On platforms with a signed char this could previously crash. This was a regression in Graphviz 2.49.0. #2502

9.0.0 - 2023-09-11

Added

• On non-Windows platforms, new -Tkitty and -Tkittyz output formats are available that render to the Kitty terminal emulator’s graphvics protocol.
• HTML/CSS-style 3 letter hex colors are supported. Each R/G/B letter is duplicated to form a 6 letter hex color. E.g. #09c is equivalent to #0099cc. #2377

Changed

• Breaking: The definition of adjmatrix_t is no longer exposed in public headers.
• Breaking: The upper limit for minimum edge length (Agedgeinfo_t.minlen) has been expanded from USHRT_MAX to INT_MAX. #2413
• Breaking: The libcdt macros DTTREEMATCH, DTTREESEARCH, dtvnext, dtvcount, dtvhere, and dtcharhash have been removed.
• Breaking: The libcgraph macros AGHEADPOINTER, AGRIGHTPOINTER, AGLEFTPOINTER, FIRSTNREF, NEXTNREF, PREVNREF, LASTNREF, NODEOF, FIRSTOUTREF, LASTOUTREF, FIRSTINREF, NEXTEREF, and PREVEREF have been removed.
• Breaking: The libcgraph types Agnoderef_t and Agedgeref_t have been removed.
• Breaking: The libcgraph function agflatten has been removed.
• Breaking: The Agdesc_s.flatlock field has been removed.
• Breaking: The str parameter from gvPluginList has been removed.
• Breaking: The definition of the elist_append and alloc_elist macros have been changed to use newer allocation functions. Users were/are not expected to call these macros.
• The functions ageqedge, agtail, aghead, agopp, agmkout, and agmkin have been reintroduced. These were previously removed in Graphviz 3.0.0. #2433
• Breaking: The first parameter dt to the makef and freef callbacks defined in cdt.h has been removed.
• Gvedit now identifies itself with organization name “Graphviz” and application name “gvedit” when reading and writing Qt-based settings. It would previously use organization name “Trolltech” and application name “MDI Example”. If you have existing settings under the old identification, Gvedit will attempt to migrate them to the new identification the first time it reads then writes settings. #2383
• Breaking: gvprintf is now tagged with __attribute__((format(printf, …))) when compiling with Clang or GCC. This enables the compiler to spot more misuses of this function. #2373
• Breaking: The hashf and eventf members of Dtdisc_t have been removed. Correspondingly, the hshf and evf parameters to the DTDISC macro have been removed. Also the _DTHSH macro has been removed.
• Breaking: The Dtdata_t.minp field has been removed.
• The print functionality of the macOS Graphviz app scales the graph to fit the output page size.
• Breaking: The libcdt containers Dtbag, Dthash, Dtlist, Dtorder, Dtdeque, and Dtstack have been removed.
• Breaking: The libcdt dtappend and dtattach macros have been removed.
• Support for Lua 5.0 has been removed. Building the Graphviz Lua bindings now requires Lua ≥ 5.1.
• Breaking: The Dt_t* parameter to the callback for dtwalk has been removed.
• Breaking: The POINTS_PER_PC macro has been removed.
• Breaking: The INITIAL_XDOT_CAPACITY macro has been removed.
• Breaking: The type parameter to dtdisc has been removed.
• Breaking: The h parameter to dtstrhash has been removed.
• In addition to Guile 2.0 and Guile 2.2, Guile 3.0 is now supported by the Graphviz Guile bindings.
• Breaking: The concept of “memory allocator discipline” has been removed, along with the type Agmemdisc_t and fields Agdisc_t.mem and Agdstate_t.mem.
• Breaking: The agcallbacks function and Agclos_t.callbacks_enabled have been removed.
• Breaking: pack_info.doSplines is now a C99 bool. Correspondingly, the doSplines parameter to shiftGraphs is now a C99 bool.

Fixed

• Processing large graphs that induce ranks containing more than 46340 (floor(√INT_MAX)) nodes no longer results in an integer overflow during crossing matrix allocation. Ranks of up to floor(√SIZE_MAX) nodes are now supported.
• Double arrow head types like invdot and onormalonormal once again display correctly. This was a regression in Graphviz 8.0.1. #2406
• The lvee and rvee edge arrow shapes are slighty incorrect for penwidths > 1. #2399
• Small gap between lcurve or rcurve arrow shaft and node. #2426
• Failure of arrowhead and arrowtail to respect penwidth #372
  Fixed also for the normal and inv edge arrow shapes when using the l or r arrow shape modifiers.
  Slightly improved for the normal and inv edge arrow shapes when not using any arrow shape modifier.
  Fixed also for the crow and vee edge arrow shapes and record based nodes.
• Various incorrect calls to gvprintf have been corrected. On some platforms like x86-64, these problems were benign thanks to coincidences in the Application Binary Interface (ABI). On other platforms, these problems may have caused stack corruption and crashes. #2373
• The font dictionary is now initialized even if a configuration file is not found. Previously this situation could lead to a crash when using Graphviz programmatically. This problem was present as least as far back as Graphviz 2.38.0. #1520
• Breaking: The vt100 output format has been renamed to vt. This fixes a problem where it was not discoverable on macOS. #2429
• Escape sequences like \" are recognized in strings and double escaping (producing \\") is avoided. #2397
• The Autotools build system no longer uses headers and libraries from the --prefix path given on the command line. This previously caused cross-compilation to incorrectly pick up host headers and libraries. #2442

8.1.0 – 2023-07-06

Added

• On non-Windows platforms, new -Tvt100 and -Tvt100-24bit output formats are available that do rudimentary rendering to a terminal that supports ANSI escape sequences.
• Some notes about the interaction with wide-oriented streams were added to the cgraph man page.

Changed

• When memory allocation failures cause Graphviz to exit, information about the failing allocation is included in the error message.

Fixed

• Failure of arrowhead and arrowtail to respect penwidth #372
  Fixed also for the curve and icurve edge arrow shapes.
• Iteration calculations based on nslimit and/or nslimit1 attributes are clamped to [0, INT_MAX]. That is, calculations that result in a negative number of iterations are rounded up to 0 and those that result in a number of iterations that exceeds INT_MAX are rounded down to INT_MAX. Iteration numbers outside this range do not have useful behavior, but could be caused unintentionally by users.
• Setting xdotversion attributes that parse as greater than 17 (xdotversion is parsed as a series of digits, ignoring all non-digits) no longer causes an out of bounds read when rendering to xdot. #2390
• Icon size in the macOS Graphviz.app has been fixed so icons are no longer invisible.
• Compiling the portable source tarball on a machine with SWIG ≥ 4.1.0 no longer fails due to missing PHP files. #2388
• Syntax for a loop in gvmap.sh has been corrected. This was a regression in Graphviz 2.50.0. #2404

8.0.5 – 2023-04-30

Changed

• Support for versions of Pango prior to 1.22.0 has been removed.
• On Windows, the Pango plugin now uses the newer pango_layout_get_baseline API.
• dot no longer installs a signal handler for SIGINT. This means typing Ctrl+C while dot is running will no longer attempt a partial render and exit with 0 status. Ctrl+C will have the standard behavior, typically aborting dot.

Fixed

• A minor inaccuracy for some cases of clipping an edge to a polygon node boundary has been fixed.
• A minor inaccuracy in node width and height for some cases of rendering polygon nodes has been fixed.
• A minor inaccuracy for some cases of calculating text height from fontsize in the GD plugin has been fixed.
• A minor vertical misalignment of text in the GD plugin has been fixed.
• Instead of using the actual font height as given by the font metrics, an approximation based on font size was used in the Pango plugin.
• A minor inaccuracy for some cases of calculating text width and height in the Pango plugin has been fixed.
• A minor vertical misalignment of text in the Pango plugin has been fixed.
• Ensure HAVE_PANGOCAIRO is set when using CMake and the library is available.
• A minor inaccuracy in node width and height for some cases of defining polygon-based nodes has been fixed.
• A minor inaccuracy for some cases of calculating margin for record-based nodes has been fixed.
• A minor inaccuracy in node width and height for some cases of defining record-based nodes has been fixed.
• On all known supported platforms except 32-bit MinGW, graphs involving small distance constraints no longer cause a crash during majorization. #1554

8.0.3 – 2023-04-16

Added

• A pre-processor script for resolving external image references (image="http…") is now available. This enables graphs to reference images from intranet or internet locations. #1664

Changed

• The accuracy of box overlapping checks during routing has been improved.

Fixed

• makeCompoundEdge: Assertion bez->sflag failed. #1879
• Graphviz.app’s export functionality has been restored. This was a regression in Graphviz 5.0.0. #2375

8.0.2 – 2023-04-10

Changed

• The Autotools build system can now detect a MacPorts-installed libANN. #1854
• Support for versions of Cairo prior to 1.10 has been removed.
• Graphs that generate rectangles with areas in the range [2³², 2⁶⁴ - 1] are now supported. Previously areas greater than 2³² - 1 would be rejected. #2371

Fixed

• Head and tail of digraph edges with dir = both were inverted if splines = ortho was used. The bug was only exposed on straight edges. Edges with at least one corner were unaffected. #144
• _Gdtclft_Init link errors when builting libtcldot_builtin using the Autotools build system have been resolved. #2365
• Incorrect string construction in the pov output formatter has been fixed.

8.0.1 – 2023-03-27

Added

• When specifying a color in HSV format, it is now possible to give an additional fourth component for the alpha channel (opacity). #510

Changed

• Graphviz will now exit when encountering a syntactically invalid HTML label instead of attempting to recover and continue. #1311
• Breaking: the url_map_n field in the obj_state_t struct is now a size_t.
• The limit of 5 unique samehead or sametail values per node has been removed. The maximum number of unique samehead or sametail values is now limited only by available memory. #452
• Breaking: The size field of the elist struct is now a size_t.
• Breaking: The size field of the nlist struct is now a size_t.
• Breaking: The n_nodes field of the Agraphinfo_t struct is now a size_t.
• Breaking: The nspans field of textlabel_t.u.txt is now a size_t.
• Breaking: The sflag and eflag fields of the bezier struct are now uint32_ts.
• Breaking: The nvertices field of the stroke_t struct is now a size_t.
• “no hard-coded metrics” warnings are now only printed once per font.
• The Autotools build system now discovers Python paths using sysconfig instead of distutils.sysconfig, making it compatible with Python 3.12. This alters the installation path of the Python Graphviz module to something more correct. #2332

Fixed

• The pic output renderer uses PIC or troff comments where appropriate, fixing a problem that resulted in comments being misinterpreted by groff and being visible in the final output. #2341
• gv2gxl and gxl2gv correctly detect their mode (gv→gxl or gxl→gv) on Windows when called via an absolute or relative path. #2344
• Using C pre-processor line directives (^\s*#(line )?\d+) claiming a line number greater than INT_MAX no longer causes an integer overflow. #1318
• fdp cluster→cluster edges were correct but now drawn incorrectly. This was a regression in Graphviz 7.0.0. #2345
• Failure of arrowhead and arrowtail to respect penwidth #372
  Fixed also for the cylinder node shape.
• Second periphery of a cylinder shaped node is not correct. #2297
• Graphs with more than 127 layers no longer cause out of bound writes. #2355
• htmltable.c assertions are no longer triggered by using HTML table cells too small to fit their content. #1622
• dot2gxl -d no longer crashes when receiving a closing node tag following a closing graph tag. #2094
• A buffer overflow in Smyrna when loading GVPR scripts has been corrected.
• A buffer overflow when loading a plugin with a long type string has been corrected.
• Graphs that involve more than 2000 stroke points during tapering calculations no longer cause out of bounds writes.
• Using arrowsize=0.0 no longer triggers an assertion failure or crash during miter calculations. This was a regression in Graphviz 7.0.0. #2342
• When using the beautify=true attribute, beautification no longer confuses leaves and dimensions. This previously could have led to skipping calculations or infinite loops.
• When using the beautify=true attribute, the first and last nodes around a circular layout are no longer placed on top of each other. #2283
• Applying concentrate=true to duplicate edges no longer results in errors due to non-normal edges being found. #2087
• splines=ortho and concentrate=true when used in combination no longer causes crashes during spline construction. #2361
• Externally referenced SVG files with their opening <svg tag on the same line as their XML declaration are no longer ignored. #2352

Removed

• The VML output renderer has been removed. This format has been superseded by SVG. #799
• Legacy man page references to dotty have been removed. dotty was removed in Graphviz 4.0.0.
• Breaking: The definition of the elist_fastapp macro has been removed.
• Versions of Librsvg prior to 2.36.0 are no longer supported.
• Versions of GDK prior to 2.0.0 are no longer supported.
• Versions of Glib prior to 2.36.0 are no longer supported.
• Breaking: The Agnodeinfo_t.inleaf field and its ND_inleaf accessor have been removed.
• Breaking: The Agnodeinfo_t.outleaf field and its ND_outleaf and GD_outleaf accessors have been removed.
• Breaking: The Agraphinfo_t.has_sourcerank field and its GD_has_sourcerank accessor has been removed.
• Breaking: The Agraphinfo_t.has_sinkrank field and its GD_has_sinkrank accessor has been removed.
• Support for the legacy Microsoft Visio VDX format has been removed.
• Breaking: The arrow_at_start and arrow_at_end parameters from the gvrender_engine_t.beziercurve callback have been removed.
• Breaking: The GVRENDER_DOES_ARROWS constant has been removed.
• The extra cmpnd.c code is no longer shipped in the Graphviz distribution tarball.
• Breaking: The STROKE_CLOSED, STROKE_FILLED, STROKE_PENDOWN, and STROKE_VERTICES_ALLOCATED constants have been removed.
• Breaking: The stoke_t.flags field has been removed.

7.1.0 – 2023-01-21

Added

• The command line option --help has been added as an alias for -?. #1618
• The command line option --version has been added as an alias for -V. #1618

Fixed

• The Autotools build system no longer errors when attempting libANN discovery during cross-compilation. This was a regression in Graphviz 7.0.6. #2335
• Graphs with more than 46341 (⌈√INT_MAX⌉) nodes no longer crash twopi. #1999
• Compatibility with /bin/sh has been restored in the Autotools build system. This was a regression in Graphviz 7.0.6. This restores the ability to compile on NetBSD which was fixed in 7.0.4 but regressed in 7.0.6. #2340
• ccomps no longer crashes when failing to open files.

7.0.6 – 2023-01-06

Changed

• The Autotools build system no longer looks for python binaries. The Python interpreter is unconditionally assumed to be python3. The configure option --enable-python is now an alias for --enable-python3.
• The Autotools and CMake build systems, when building gvedit, will now look for and use Qt6 in preference over Qt5. #2233
• Reserved stack size on Windows for the dot.exe binary has been increased from ~3.8MB to 32MB. #1710
• Reserved stack size on macOS for the dot binary when built with CMake has been increased from 8MB to 32MB. #1710
• The Autotools build system can now find libANN on Debian-based operating systems, enabling compilation of libmingle and mingle. #1835
• The webdot web server interface to Graphviz has been removed. For a modern replacement, see for example https://github.com/magjac/d3-graphviz. #1131

Fixed

• The modgraph.php example no longer includes gv.php, which is no longer generated by SWIG 4.1.0. #2322

7.0.5 – 2022-12-23

Fixed

• Using style attributes in excess of 128 bytes and/or 63 individual styles no longer results in out-of-bounds memory accesses. #2325

7.0.4 – 2022-12-03

Fixed

• The alt attributes are once again set in the cmap output. This was a regression in Graphviz 7.0.2, that intentionally removed these but did not account for the W3C specification making these attributes required when the href attribute is set. #265, #2319
• Building Graphviz from source using the Autotools build system in now possible on NetBSD. #2317
• The ortho library now allocates trapezoid structures on-demand, removing the “Trapezoid-table overflow” error that previously occurred when its upfront estimation was exceeded. #56, #1880

7.0.3 – 2022-11-26

Changed

• Support for the Intel C Compiler in the Autotools build system has been removed. #2298
• Fallback typedefs for ssize_t have been removed from the CMake build system.

Fixed

• The CMake build system no longer builds auxiliary tools beyond gvpack with demand loading disabled.
• gvpack built with the CMake build system can now find plugins correctly at run time. #1838

7.0.2 – 2022-11-18

Added

• The cluster, dot_builtins, dot2gxl, gv2gxl, gvedit, and prune utilities are now included in the CMake build system. #1753, #1836

Changed

• gvedit now uses a relative path from its own executable to discover its attributes file, ../share/graphviz/gvedit/attrs.txt. This should make it more relocatable and make its behavior more consistent across operating systems.
• alt tags are no longer set in the cmap output. #265

Fixed

• gxl2gv, when dealing with name attributes, may be less likely to crash. We say “may be less likely” because a bug remains that makes a crash still the most likely outcome. #2300
• Gradient URL references in SVG output once again align with their targets (linear or radial gradients) when id attributes are in use. This was arguably a regression in Graphviz 6.0.1. #2307
• The CMake build system’s interactions with a Zlib installed in a non-system location has been improved.
• Do not try to install gv.php if using SWIG-4.1.0. Graphviz 7.0.1 changes listed SWIG 4.1.0 as supported, but there was an oversight that is fixed in 7.0.2. Complete #2277, #2303
• Several compilation errors when building Smyrna on macOS have been fixed. This was a regression in Graphviz 7.0.1.
• A crash when using neato layout with large inferred per-node edge counts was fixed. #42

7.0.1 – 2022-11-09

Added

• SWIG 4.1.0 is now supported in the Autotools build system. #2277, #2303

Changed

• When built with zlib support, Graphviz will unconditionally use deflateBound. The only user-visible effect should be slightly decreased memory usage when using a zlib-compressed output format.
• The test suite only detects Graphviz companion programs adjacent to the first dot found in $PATH #2201

Fixed

• Failure of arrowhead and arrowtail to respect penwidth #372
  Fixed also for the diamond and tee edge arrow shapes.
• The CMake build system no longer uses the final install location as the staging area for example graphs and templates during cpack. This bug was introduced in Graphviz 4.0.0. #2232
• The CMake build system uses corrected paths to DevIL and FreeType headers and libraries when discovered.
• The CMake build system under MinGW no longer attempts to install third party Expat and Getopt libraries.

7.0.0 – 2022-10-22

Changed

• Breaking: An outline_width field has been added to the Agnodeinfo_t struct.
• Breaking: An outline_height field has been added to the Agnodeinfo_t struct.
• When using the CMake build system, the minimum requirement has been increased from CMake 3.9 to CMake 3.13.0.
• When compiling Graphviz with the Intel C Compiler, the Autotools build system no longer suppresses -ffast-math. Users relying on this are encouraged to investigate what in their build environment is appending a flag their C compiler does not support.
• The -ffast-math compiler flag is no longer enabled by the Autotools build system.
• Reserved stack size on Windows for the dot.exe binary has been increased from the default 1MB to ~3.8MB.

Fixed

• Issues with GCC 8, -O3 and -ffast-math #1412
• Problem building Graphviz-5.0.1: undefined symbols __*_finite #2296
• Failure of arrowhead and arrowtail to respect penwidth #372
  Fixed for all polygon-based node shapes (except for the cylinder node shape) and for the edge arrow shapes normal, inv, box and dot

Removed

• Support for the MOSEK commercial solver has been removed. The MOSEK build-time macro no longer does anything.

6.0.2 - 2022-10-11

Fixed

• Using aspect with a custom value in the packmode attribute is no longer misparsed.
• Smyrna bounding box computation has been corrected. There was a regression in 4.0.0 that resulted in a degenerate bounding box being computed for any input graph. See #2279 for details.
• Smyrna warnings about the on_attrRB0_clicked and on_attrSearchBtn_clicked handlers being not found have been fixed and the buttons to which they are wired should be functional again. This was a regression in 2.50.0 See #2279 for details.
• Smyrna warnings about the mAttributesSlot handler being not found have been fixed and the button to which it is wired should be functional again. This was a regression in 2.49.2 See #2279 for details.
• Graphviz no longer fails to load private Ghostscript symbols ("Could not load libgvplugin_gs.so.6) #2280
• trailing commas issue with fdp layout #2282
• Missing -S in sccmap man page usage summary.
• In sccmap, a -v option following a -S option now re-enables strongly connected component output that the man page implied.

6.0.1 – 2022-09-11

Changed

• Breaking: libxdot fields for the size and number of operations, the statistics counts, and polygon line points are now size_t values instead of int values
• Accuracy of the bounding boxes printed by the showboxes feature have been improved.

Fixed

• Id attribute is not used in linearGradient. #2258
• Graphviz 5.0.1 undocumented change of automatically generated output filename with -O flag (missing dot separator). This was a regression in 5.0.1. #2270
• Assert fail in aaglex for multiple calls to agmemread. This was a regression in 5.0.1. #2272

Removed

• The $GV_FILE_PATH sandboxing mechanism has been removed #2257

5.0.1 – 2022-08-20

Fixed

• -Tx11: Assertion xev.xbutton.button >= 1 && xev.xbutton.button <= 5 && "Xlib returned invalid button event" failed #2256
• missing Perl includes patch #2262
• smyrna: incorrect tokenization in frmobjectui.c:set_attr_object_type #2259
• [Dot] Record shape+UTF+" | "=Eats spaces. #925
• Memory leak in osage
• Segmentation fault when running test example neatopack.c #1800
• Memory leak in dot when using clusters
• Memory leak in patchwork when using clusters
• Subgraph layout and rendering
• Generated SVG files no longer use transparent paint or color as this keyword does not exist in SVG 1.1, and instead use none or a zero-opacity color.
• Unnecessary space in 'points' attribute for 'polyline' in SVG output
• graphml2gv no longer calls itself cvtgxl in error messages

Added

• GVContext::version() to lib/gvc++
• GVContext::buildDate() to lib/gvc++

5.0.0 – 2022-07-07

Changed

• use_sanitizers option has been removed from the CMake build system.

Fixed

• Breaking: The 4.0.0 change replacing the Agiodisc_t struct member putstr by printf has been reverted
• graphviz-4.0.0: build error: cmd/tools/gvcolor.c:159: undefined reference to fmax #2246
• Failed assertion in chkSgraph for twopi layout and ortho splines. #14
• Failed assertion in chkSgraph for dot layout and ortho splines. #1408
• Failed assertion in chkSgraph for circo layout and ortho splines. #1990
• Segmentation Fault with splines="ortho". #1658
• Transparent Label appear in SVG output #146
• Binary tcl modules should compile with -module #1285
• b15.gv crashes dot #827
• heap overflow in function startElementHandler in gxl2gv.c #2093
• Crash on assertion #121
• xdotversion attribute is no longer misparsed. This was a regression in Graphviz 2.47.2. #358

4.0.0 – 2022-05-29

Changed

• Breaking: The mark field of the Agnodeinfo_t struct is now a size_t instead of a char.
• Breaking: The unused shape_t struct has been removed from the public header types.h
• Breaking: The Agiodisc_t struct member putstr that was previously an fputs analog is replaced by printf that is required to behave similar to fprintf.
• the mingle, diffimg, gvmap, and edgepaint binaries are now included in the CMake build system
• the gvmap.sh and vimdot scripts are now installed by the CMake build system on operating systems other than Windows
• a brief note about the (previously undocumented) behavior of Graphviz when sent SIGUSR1 is now mentioned in the man page
• build system support for dotty, lefty, and lneato has been removed
• the CMake build system now includes the DevIL, GDK, GhostScript, GTK, LASi, Poppler, Quartz, Rsvg, Visio, WebP, and Xlib plugins
• awk is no longer a build-time dependency #2118

Fixed

• agcanon, agcanonStr, and agwrite now return error values on memory allocation failures instead of crashing or corrupting data
• gvpr programs can now pass dynamically allocated arguments to user-defined functions without corrupting their content. Some cases of this were a regression in Graphviz 2.46.0. Other cases have existed since the first release of gvpr. #2185
• spurious "no hard-coded metrics" warnings on labels with empty lines #2179
• fixed corruption of user shape characteristics during EPSF initialization
• output formats canon, dot, and xdot are not completely faithful to input #2184
• gvpr index function produces wrong results #2211. This was a regression in Graphviz 2.47.0.
• Error on more than 128 cluster subgraphs #2080
• dot2gxl no longer crashes on input <node id=""> #2092
• remove itos #2229
• sfdp no longer crashes on certain graphs with cycles. #2225
• gml2gv does not handle integer penwidth correctly #1871

Removed

• the glitz plugin has been removed. The plugin was never complete and distributions no longer ship glitz.

3.0.0 – 2022-02-26

Changed

• Breaking: Using Graphviz as a library on Windows now requires the GVDLL symbol to be set to ensure correct linking.
• Breaking: Graphviz headers no longer define the boolean type. A replacement is C99 bool in the C standard library’s stdbool.h.
• Breaking: The insidefn member of the shape_functions struct must now be a pointer to a function returning a C99 bool instead of a Graphviz-specific boolean.
• Breaking: The swapEnds and splineMerge members of the splineInfo struct must now be pointers to functions returning a C99 bools instead of Graphviz-specific booleans. Similarly the ignoreSwap and isOrtho members of this struct must now be C99 bools instead of a Graphviz-specific booleans.
• Breaking: The defined, constrained, clip, and dyna fields of the port struct are now C99 bools instead of Graphviz-specific booleans.
• Breaking: The set and html fields of the textlabel_t struct are now C99 bools instead of Graphviz-specific booleans.
• Breaking: The usershape field of the shape_desc struct is now a C99 bool instead of a Graphviz-specific boolean.
• Breaking: The candidate and valid fields of the rank_t struct are now C99 bools instead of Graphviz-specific booleans.
• Breaking: The filled, landscape, and centered fields of the layout_t struct are now C99 bools instead of Graphviz-specific booleans.
• Breaking: The has_images, has_flat_edges, has_sourcerank, has_sinkrank, expanded, and exact_ranksep fields of the Agraphinfo_t struct are now C99 bools instead of Graphviz-specific booleans.
• Breaking: The clustnode and has_port fields of the Agnodeinfo_t struct are now C99 bools instead of Graphviz-specific booleans.
• Breaking: The conc_opp_flag field of the Agedgeinfo_t struct is now a C99 bool instead of a Graphviz-specific boolean.
• Breaking: The must_inline and nocache fields of the usershape_t struct are now C99 bools instead of Graphviz-specific booleans.
• Breaking: The device_sets_dpi, external_context, fit_mode, needs_refresh, click, has_grown, and has_been_rendered fields of the GVJ_t struct are now C99 bools instead of Graphviz-specific booleans.
• Breaking: The loadimage member of the gvloadimage_engine_t struct must now accept a C99 bool parameter instead of a former Graphviz-specific boolean parameter.
• Breaking: The textlayout member of the gvtextlayout_engine_t struct must now return a C99 bool instead of a Graphviz-specific boolean.
• Breaking: The config and auto_outfile_names members of the GVC_common_s struct are now C99 bools instead of Graphviz-specific booleans.
• Breaking: The fixed member of the pack_info struct is now an array of C99 bools instead of an array of Graphviz-specific booleans. Similarly, pack_graph now takes a bool array instead of a boolean array.
• Breaking: pccomps now takes a C99 bool instead of a boolean output parameter.
• Breaking: gvusershape_file_access now returns a C99 bool instead of a Graphviz-specific boolean.
• Breaking: 1-bit fields of the obj_state_s struct are now unsigned instead of signed.
• Breaking: Graphviz headers no longer define the constant MAXSHORT. A drop-in replacement is SHRT_MAX in the C standard library’s limits.h.
• Breaking: Graphviz headers no longer define NIL macros. A drop-in replacement is NULL in the C standard library’s stddef.h.
• Breaking: Graphviz headers no longer define the NOT macro. A drop-in replacement is the C/C++ operator !.
• Breaking: Graphviz headers no longer (re-)define the C constants INT_MIN and INT_MAX. Replacements can be found in the C standard library’s limits.h.
• Breaking: Graphviz headers no longer define the constant _DUMMY_ELEM.
• Breaking: The -m memory test option to Graphviz command-line programs has been deprecated. Tools such as Leak Sanitizer are a more effective modern way of diagnosing memory safety issues.
• Breaking: Graphviz headers no longer define the constant MAXFLOAT. A replacement is FLT_MAX in the C standard library’s float.h.
• The Ming plugin that produced Shockwave files has been removed. This format was EOLed by Adobe in April 2019. #2160
• CentOS 7 packages now include libmingle and the mingle program.
• The tclpkg Makefile no longer suppresses -fstack-clash-protection nor other compiler options containing -x
• Lefty is no longer enabled in the portable source tarball.
• on Linux, the CMake build system uses the standard GNUInstallDirs to locate target installation paths

Fixed

• Breaking: GVPR now typedefs ssize_t as SSIZE_T on Windows instead of int #1804
• Breaking: vgpanecmd in the TCL tclpathplan library no longer accepts abbreviated commands (e.g. r for rotate) and commands must be given in full #1961
• fix detection of unavailable output format
• SVG layout doesn't always respect requested size #1855
• mismatched format string in mingle
• Building from scratch with Visual Studio fails #2175
• Plugins are not configured on MinGW #2176
• gvpr on MinGW does not support absolute paths #1780
• PNG format not available in CMake builds with MinGW
• tclpkg Makefile corrupts CFLAGS #2177
• lneato -? sometimes fails with STATUS_STACK_BUFFER_OVERRUN on Windows #1934
• expr misinterprets << and >> #2103
• stdout and stderr are not flushed at exit on MinGW #2178
• Gvedit on macOS now understands the -? help command line argument
• CMAKE_LIBRARY_PATH is not honored #1973
• assert failure with nslimit1=0 #1902
• gvpr usage output has been restored. This was a regression in Graphviz 2.46.0.
• C++ API not usable after install #2196

2.50.0 – 2021-12-04

Added

• hard-coded lookup tables for fallback font metrics for more fonts and font variants
• a new gvputs_nonascii API function has been implemented for GVC I/O with C escaping

Changed

• Check for existence of dl_iterate_phdr(3) and if it is available, prefer using it instead of iterating over /proc/self/maps for computing libdir.
• A limit on GVC config files of 100000 bytes has been removed.
• MD5 checksums of release artifacts are no longer provided. SHA256 checksums are still provided and these should be used instead.
• when cross-compiling, the dot -c is no longer run during installation
• $CMAKE_INCLUDE_PATH is no longer manually configured in the CMake build system

Fixed

• remove Bashism from gvmap.sh #2151
• Lefty artifacts are no longer installed when Lefty is disabled #2153
• Smyrna artifacts are no longer installed when Smyrna is disabled
• calling convention mismatches in delaunay.c’s GTS code
• impure assertion in jacobi
• undefined behavior in libgvc’s reading of little endian numbers
• boldness of agnxtsubg in cgraph man page
• parameter name in gvusershape_find prototype corrected to a const pointer, to match the implementation
• xdot JSON output is not valid JSON #1958
• fix uninitialized read of pid in _sfpopen on Windows
• claimed minimum CMake version supported has been corrected to 3.9

2.49.3 – 2021-10-22

Fixed

• gvpr "split", "tokens", and "index" functions produce incorrect results #2138. This was a regression that occurred between 2.47.1 and 2.47.2.

2.49.2 – 2021-10-16

Changed

• Lefty is disabled by default in the Autotools build system. To re-enable it, pass --enable-lefty to ./configure. In a future release, Lefty will be removed.
• remove PHP5 support in SWIG bindings

Fixed

• Msys experimental packages are included in release artifacts #2130
• CMake build system incorrectly aliases gv2gml to gml2gv #2131
• Gv2gml Doesn't escape quotes in attributes #1276
• GVPR incorrectly understands color schemes #1956

2.49.1 – 2021-09-22

Changed

• the CMake build system installs gzipped man pages if gzip is available #1883
• CMake projects using Graphviz as a subproject (add_subdirectory) can now link against and use gvc.

Fixed

• various problems in the generation of Javascript bindings
• 2.48.0: test suite is failing #2112
• Ensure correct file-level dependency for generated file in cmake generated projects #2119
• compile failures with a C++20-compatible toolchain #2122
• compile errors on macOS when using Bison 3.8 #2127
• Make Graphviz buildable as a cmake subproject/subdirectory #1477
• Header not found in Cmake project #2109

2.49.0 – 2021-08-28

Added

• a very basic C++ API for a subset of the functions in lib/cgraph and lib/gvc, allowing a graph to be rendered from DOT source to a specified format. The new API is available through two new libraries: lib/cgraph++ and lib/gvc++. It is experimental, meaning that it might have breaking changes also in upcoming patch or minor releases (towards #2001)
• CMake builds now support an with_expat option that allows the support for using HTML-like labels through the optional expat library to be explicitly enabled (default) or disabled
• CMake builds now support an with_zlib option that allows the support for raster image compression through the optional zlib library to be explicitly enabled (default) or disabled

Changed

• the CMake build system now enables -Wextra when building C++
• some Cgraph functions that take char* arguments that they do not modify have been updated to take const char* arguments #634
• incorrectly using the layout attribute on anything other than a graph now results in a warning about this being invalid #2078
• edgepaint accepts more standard -- prefixed command line arguments and rejects invalid options #1971
• improved detection of Lefty dependencies in the Autotools build system
• libexpr rejects printing the time (%t) if no format is provided
• -DDATE=… option in the CMake build system has been removed
• the Autotools build system no longer writes the DATE file and the portable source tarball no longer includes this

Fixed

• The attached dot file causes a segfault when processed #2095
• fix typos and update URLs in edgepaint usage text and man page
• Fix clang's undefined behavior warning in dotLayout
• gvpr doesn't build on macOS but MKDEFS_EXECUTABLE points to wrong directory #2101
• the generated gdefs.h header is no longer installed
• ccomps out-of-memory message no longer incorrectly refers to gc
• do not abort when calloc(0, x) or calloc(x, 0) in gcalloc return NULL
• failed Exshort_t type discrimination #1799
• dot manpage is in wrong directory on Windows #1936
• CMake builds fail when when the ltdl library is not available even if the enable_ltdl option is ON
• CMake builds fail when when the optional zlib library is not available
• fix graph rotation in quartz plugin

2.48.0 - 2021-07-17

Added

• a new C++ test infrastructure based on ctest and Catch2 towards #2002
• support for test coverage analysis with lcov and test coverage visualization in GitLab MRs

Changed

• updated Graphviz bug report URL in the Autotools build system
• Fix WIN32 path of gvc.def specified in libgvc_la_LDFLAGS
• the CMake build system now not only checks for Bison, but also ensures the found version is recent enough #1916

Fixed

• ortho's eqEndSeg incorrectly modifies its arguments #2047
• Autotools enables -Wtrampolines and -Wlogical-op for Clang #2066
• node_distinct_coloring failure due to out-of-memory now reported correctly instead of referring to a failure to open lab_gamut
• Fix a typo GD_LIBS to GDLIB_LIBS in tclpkg/tcldot/Makefile.am !2022
• Autotools build system sets libgd variables now instead of incorrectly setting GTK variables
• HTML strings used as labels are distinguishable in GXL output by kind="HTML-like string"
• a Bashism removed from the Autotools build system
• when Criterion is available, the command_line test binary is no longer built and installed by default, but rather during make check
• round-tripping a file through gv2gxl and then gxl2gv no longer causes HTML-like labels to become non-HTML like labels #517
• fix ODR violation by including the ortho object files in the gvc lib also for CMake and MSbuild #2096

2.47.3 - 2021-06-19

Changed

• marginally more accurate computations in Smyrna sphere projection
• Perl is no longer required to build Graphviz #2067
• nop more reliably returns success and failure exit statuses
• implicit 63 character limit on plugin names is removed in GVC
• the packaging work flow on CentOS 7 now selects the Python 3 bindings, instead of Python 2 bindings
• remove Python 2 bindings #1992
• improved thread-safety in Graphviz bindings Makefile

Fixed

• no longer pass libcommon to the linker twice in mm2gv when building with CMake
• Quartz plugin is now compiled with explicit --tag=CC to libtool #2065
• out of bounds read when attempting to load a plugin whose name is ≥63 characters
• out of bounds read when examining a registered plugin whose name is ≥63 characters
• do not fclose(NULL) in gvmap
• Assertion error when using dot in ortho.c in convertSPtoRoute in graphviz 2.47.2 #2082. This was a regression introduced in 2.47.2.

2.47.2 - 2021-05-26

Added

• CMake option use_sanitizers which enables building with address and undefined behavior sanitizer

Changed

• $PATH is no longer assumed to be "/bin:/usr/bin:/usr/local/bin" if unset
• test suite no longer assumes python3 exists #2049
• CMake build system locates Python 3 before calling it
• diff and grep are no longer required to build Graphviz on Windows

Fixed

• Uninitialized variable read in delaunay_tri
• potentially mismatched format string in tclpkg
• gvToolTred is now exported from gvc.dll on Windows mirroring the behavior on Unix platforms.

2.47.1 - 2021-04-17

Changed

• More detailed error messages when opening input file fails

Fixed

• Windows build thinks xdg-open can be used to open a web browser #1954
• lab_gamut_data misses a value #1974
• xdot man page does not document some functions #1957
• Superfluous empty @param in documentation #1977
• PIC renderer does not work and probably never has #131
• dot conversion to dia format #689
• memory leak of reference-counted HTML strings
• Align rank from bottom in dot graph #1339
• Fix for TBbalance attribute code #1980
• HTML parser error with single closing square bracket in table row #1893
• reference counted strings put the HTML bit in the middle of the reference count #1984
• &amp; escape disappearing #797
• miscalculation of minimum rank on large graphs
• AddressSanitizer: strcpy-param-overlap in gvconfig_libdir when running dot -c #1994
• fix reuse of va_list in pov rendering

2.47.0 - 2021-03-15

Changed

• The edges in JSON output are ordered now !1728
• remove regex usage #1919
• RxSpencer is no longer a dependency on Windows
• gvmap.sh is compatible with POSIX shells in addition to ksh
• sed is no longer a build dependency on Windows
• SHA256 checksum generation? #1955

Fixed

• Fix gvpr -? to actually print usage and exit non-zero
• gvpr is not built by CMake #1878
• typos in gpcanvas.c #1927
• memory leak in libmingle
• private inheritance in IncVPSC #1874
• broken sorting in nearest_neighbor_graph_ann.cpp #1938
• memory leak in ANN bridge
• gvpr on Windows does not support absolute paths #1780
• buffer overflow in unflatten
• agxbputc macro does not bracket its arguments #1814

2.46.1 - 2021-02-13

Added

• Support for building against Guile 2.2
• Portable source is now also offered as a .tar.xz

Changed

• CentOS/RHEL 6 is no longer supported
• Vestiges of Qt4 support have been removed
• C++11 support is now required of the C++ compiler used to build Graphviz
• C99 support is now required of the C compiler used to build Graphviz
• Question about userout() function in agerror.c #1924
• The minimum version of Python required to run the test suite is 3.6

Fixed

• memory leak in label construction
• gvedit compilation errors out, but works if manually compiled with qt5 #1862
• incorrect HTML BR attribute parsing code #1913
• broken overflow checks in RectArea #1906
• various memory leaks !1699
• Fix bad free in lefty !1709
• typo in pathcross #1926
• Out-of-bounds write caused by incorrect error handling of malloc in genUserdata #1928
• Offer .tar.xz files too #454
• Header file graphviz_version.h has no include guards #1929
• regression: newlines embedded in quoted labels / node names are not preserved in 2.46.0 #1931
• Properly fill graphviz_version.h !1706

2.46.0 - 2021-01-18

Added

• Cgraph's agxbuf API gained a new function agxbdisown(), for dissociating backing memory from the managed buffer
• Build system support for the Elbrus 2000 CPU, thanks to Michael Shigorin

Changed

• Cgraph's agheap() API has been removed
• Autotools build system support for eFence has been removed
• Building Graphviz with ICC defaults to -O2 instead of -O0
• Build system work arounds for GCC 3 have been removed
• Incomplete support for running the test suite under CMake has been removed
• Portable source tarballs now use the “ustar” POSIX format
• Minimum version of Flex required to build Graphviz is now 2.5.2
• Minimum version of Bison required to build Graphviz is now 3.0
• Minimum version of CMake required to build Graphviz using CMake is now 3.1

Fixed

• gvpr: line numbers in gvpr errors/warnings are incorrect #1594
• URL typo in patchwork man page
• Escaped backslashes are not correctly handled when producing xdot with dot #165
• heap-over-flow(off-by-null) in lib/common/shapes.c #1700
• Windows MSBuild executables have the wrong version #1745
• Cast Overflow at pango_textlayout #1314
• x11 back end segfaults if display is unavailable #1776
• typo in cmd/gvpr/lib/clustg #1781
• Segfault in dot #1783
• Incorrect 'Arrow type "s" unknown' error #1444
• segfault on reading 0x10 #1724
• Null-dereference READ (144736912) #1676
• "Warning! PATH too long installer unable to modify PATH!" using CMake Windows installer and PATH length > 1024 #1770
• gvedit -? gives "option - unrecognized - ignored" instead of showing usage #1813
• lefty is not built for Windows (fixed for MSBuild builds only) #1818
• a failure to detect OpenGL glGenTextures() errors has been corrected
• sfio does compile time benchmarknig #1422
• iffe "lib" check always succeeds when compiler optimises #1521
• syntax error near text who is not present #1411
• Explicitly links with libstdc++; should allow libc++ if appropriate #163
• A macOS file that was erroneously excluded from portable source tarballs has been restored
• Add option -? for usage to diffimg
• Add option -? for usage to dotty
• Add option -? for usage to lneato
• Add option -? for usage to vimdot
• Fix smyrna -? to actually print usage instead of error
• Fix edgepaint -? to actually print usage instead of error
• Remove '"' from usage text in non-Windows version of dotty
• Correct misspelled 'smyrna' in usage
• Fix edgepaint -o option
• Correct shebang of gvmap.sh to use ksh
• Fix gvmap.sh -? option to exit with zero exit status
• Graphviz doesn't build on MacOS with the latest libc++ #1785
• make fails if ps2pdf is not installed (using autotools) #1763
• multiple graphs to file output causes a segfault #1845
• lefty PTY functionality relies on file descriptor implementation details #1823
• buffer overflow in fdpgen
• Crashes by VRML output when current directory is not writable #793
• Segmentation fault when newrank=true #1221
• sfdp craches #236
• fdp segmentation fault with GK=0 #1290
• fdp crash #1865
• Graphviz always crash with this simple dot file #167
• Seg fault in dot #1771
• gml2gv doesn't handle some attributes correctly #1869
• Add missing circo, fdp, neato, osage, patchwork, sfdp & twopi tools to Windows builds (copies of dot)
• Add gv2gml tool to CMake (copy of gml2gv on Windows, symlink to gml2gv otherwise)
• Regression: fdp generates internal names in the output #1876
• Regression: fdp assertion error on cluster in edge #1877
• Regression in id / <title> in svg for twopi #1907

2.44.1 - 2020-06-29

Added

• applied RH patches (from graphviz-2.42.2-8.fc32.src.rpm)
  • graphviz-2.42.2-coverity-scan-fixes.patch
  • graphviz-2.42.2-dotty-menu-fix.patch
  • graphviz-2.42.2-ocaml-allow-const-cast.patch
• some allocation failures that could previously allow memory corruption now exit
• lab_gamut.3.pdf is no longer included in release archives

Changed

• Windows binaries available at https://www2.graphviz.org/Packages/ instead of https://ci.appveyor.com/project/ellson/graphviz-pl238
• Retarget Windows builds to Visual Studio 2019 and toolset v142

Fixed

• Released Ubuntu packages does not contain language bindings for Python3 #1737
• Neato's hier mode is broken since v2.44.0 #1726
• Segmentation fault (core dumped) #1436

2.44.0 - 2020-04-08

Added

• New SGD mode in neato (thanks Jonathan Zheng)
• Add pkg-config files !1322
• tred: add feature to output removed edges to stderr upon request !1326
• Fix issue #1671: Workaround: avoid creating a virtual edge loop. !1328
• Add riscv64 to host_cpu configure.ac !1329
• lib/cgraph: include empty malloc.h from subdir include !1332
• lib/gvpr: compile mkdefs with $(HOSTCC) rather than $(CC) !1333
• lib/vpsc: rename bcopy->b_copy !1334

Fixed

• MSB4018 The NativeCodeAnalysis task failed unexpectedly. #1481

2.42.4 - 2020-04-05

Added

• Include all test files in distro !1341
• host_cpu add mips64 platform !1325
• Correct description of 'port' syntax in manual !1324

Fixed

• svg output displays TITLE of %3 if graph had no name #1376
• XML errors in generated SVG when URL attribute contains ampersand (&) #1687
• Test files missing from source distributions #1647
• SVG error for "g.transform.scale " in graphviz version 2.43 #1605

2.42.3 and earlier

October 9, 2019
    - Release 2.42.3
	- Merge 1316, 1317, 1319, 1320
	- Patches #1591, #1596
	- Add Fedora 32 builds
	- CI/CD fixes
	- Documentation (Warning about HTML label usage)

September 17, 2019
    - Release 2.42.2 - ( Never fully released due to CI/CD hardware issues )
    - Fix deployment issues.  Builds can now be found under:
	             http://www2.graphviz.org/Packages/
July 17, 2019
    - Release 2.42.1
    - Fix deployment issues.  Builds can now be found under:
	             http://www2.graphviz.org/Packages/
July 4, 2019
    - Release 2.42.0
    - Fixes quite a few bugs
September 22, 2017
    - Move master repo to GitLab: https://gitlab.com/graphviz/graphviz
December 21, 2016
	- Remove usage of ast_common.h
December 20, 2016
    - Release 2.40.0
        - network-simplex fixes and optimization (Stephen North)
	- built-in tred tool now available in the various swig generated
	language bindings (John Ellson)
	- number rounding added to SVG renderer (same as PS and TK rounding)
	to aid regression testing. (John Ellson)
	- additional regressson test framework, used in Travis CI builds. (Erwin Janssen)
	- PHP7 support (requires swig-3.0.11 or later). (John Ellson)
	- Allow user to specify clustering algorithm in gvmap. (Emden Gansner)
	- Add Sierpinski graph generator to gvgen. (Emden Gansner)
	- Extensive code cleanup (Erwin Janssen)
	- Removal of libgd source - use vanilla libgd from separate install
	- Windows builds (Erwin Janssen)
	- Appveyor CI for automated Windows build testing (Erwin Janssen)
	- Travis CI for Fedora/Centos builds (Erwin Janssen)
	- Added JSON output format, -Tjson  (Emden Gansner)
	- New curved arrowhead, cylinder node shape.
	- Resolves bugs: 2599, 1172
June 18, 2016
	- Experimenting with Travis CI
February 13, 2016
	- Add cylinder shape for databases.
	- Free installed plugins
	- Update makefile for dot so that the using libpanco_C in the static build include PANGOFT2
        as well as PANGOCAIRO_LIBS (needed for some versions of Ubuntu)
February 1, 2016
	- Add json output format
April 26, 2015
	- output class value in svg files
September 9, 2014
	- Add plain shape for use with HTML-like labels.
August 12, 2014
	- Add icurve arrowhead.
July 28, 2014
	- Revert to old, translate to origin semantics in neato, etc. Add flag notranslate if that is
          what the user desires.
April 13, 2014
	- Release 2.38.0
	- Resolves bugs: 2409, 2413, 2417, 2420, 2422, 2423, 2425
March 27, 2014
	- Enable packing for dot
	- Allow scaling to work for all non-dot layouts
March 9, 2014
	- Add overline text characteristic.
March 4, 2014
	- Fix bugs in gvpr and gv.cpp so edges can be created in subgraphs.
	- Add edgepaint program for coloring edges to make them easier to tell apart.
	- Modify neato to avoid unnecessary translations of output. This allows positions
	given on input to remain the same on output.
	- Fix swig java package to work and support gv.renderresult.
	- Fix test for the absence of layout (old test relied on statically allocated Agraphinfo_t).
	- HTML-like tables and cells can now specify which borders should be drawn.
	- The fixedsize attribute now takes the value "shape" which allows labels much larger than the
	node shape.
January 11, 2014
	- Release 2.36.0
	- Resolves bugs: 2372, 2384, 2388, 2391, 2392, 2383, 2395, 2401, 2406
	- Various MacOS Fixes from Pixleglow.
	- Remove old libgraph sources from distributions.
	- Move master git repo to github.com
September 15, 2013
	- Add <S> element for strike-through to HTML-like labels.
September 6, 2013
	- Release 2.34.0
	- New version of xdot supporting inline text characteristics such as <b> and
	version-specific output based on xdotversion
	- Resolves bugs: 2325, 2326, 2333, 2334, 2337, 2338, 2340, 2343,
		2345, 2346, 2349, 2350, 2351, 2352, 2353, 2354, 2357, 2359
	- Resolves Redhat bug: BZ#847458
August 21, 2013
	- Added mingle command and library for edge bundling
August 1, 2013
	- Release 2.32.0
	- New version of xdot format, annotating gradient color schemes
	- Support for reading pdf images using poppler
	- Lefty/dotty/lneato now accept anonymous graphs
July 2, 2013
	- Add star node shape
	- Add two-tone (non-gradient) fill
February 14, 2013
	- Release 2.30.1
	- various build fixes
January 13, 2013
	- Release 2.30.0
	- Replaced libgraph with libcgraph; use of libgraph is now deprecated
	- New ranking algorithm that allows multiple subgraph constraints
November 27, 2012
	- Add graphml2gv and gv2gml to Windows package.
September 25, 2012
	- Support edges using curved arcs.
August 16, 2012
	- Added new shapes used by the synthetic biology community.
July 12, 2012
	- For HTML-like labels, provide rounded cells, and dashed or dotted borders.
	- Add lcurve and rcurve arrowheads.
	- Add prototype pie chart and striped fills.
	- Support insets in treemaps to make containment clear
June 7, 2012
	- Add random rooted tree generation to gvgen
February 29, 2012
	- Allow GVPRPATH to specify that the default path be prepended or appended to it.
February 27, 2012
	- Support arbitrary lists of layers; allow the user to specify arbitrary layers for output.
February 24, 2012
	- A collection of gvpr scripts, which were part of the source package, are now
	installed in <prefix>/share/graphviz/gvpr, and the that path is used as part of th
	default built-in path for gvpr.
February 15, 2012
	- Update libexpr to reflect Glenn Fowler's changes including scopes for variables.
February 9, 2012
	- Add next graph variable to gvpr
February 8, 2012
	- Modify dot and fdp so that a cluster's margin attribute will affect the space
	  between the bounding box and nodes
January 26, 2012
	- Modify the dijkstra tool to use only directed edges
	- Output numbers without quotes if quotes are not needed on input
	- Support gradient fill
January 23, 2012
	- Provide support for webp images
January 17, 2012
	- Fix tapered edges to use the dir attribute and arrowhead
September 21, 2011
	- Add imagepath attribute
	- Add help functionality to Graphviz.app
August 24, 2011
	- Add <B>,<I>,<U> to html strings via svg
August 16, 2011
	- Add tapered edges
August 3, 2011
	- Add support for external labels
July 14, 2011
	- Add initial implementation of graphml2gv
July 8, 2011
	- Add basic horizontal and vertical rules to html tables
May 6, 2011
	- Release 2.28.0
	- incremented library api version:
	    libcdt, libgraph, libcgraph, libgvpr, libgvc
	- Add gvmap, cluster and gvmap.sh
	- Deprecate dotty; prefer gvedit
	- Add patchwork supporting squarified tree maps
	- Add ordering as a node attribute
	- Fix problems with font resolution
	- Fix problems with text placement
	- Fix twopi to set root attribute
	- Make available layouts and formats available via the API
	- Fix error message system so that an application can capture the messages
	- New Qt-based version of gvedit
	- New attributes and features for sfdp
	- gvgen now allows the user to specify graph name and node name template
	- Make overlap=false denote overlap=prism
	- More efficient xdot library
	- HTML-like labels provide ID
	- Fixed bugs: 1480 1980 2044 2087 2088 2089 2091 2093 2094
	2095 2101 2102 2103 2104 2112 2113 2118 2128 2129 2139 2149
	2157 2113 2159 2160 2161 2163
March 31, 2011
	- Add many new gvpr scripts to release package
	- Add scale attribute to twopi
October 14, 2010
	- Add <B>,<I>,<U> to html strings via cairo
February 15, 2010
	- migrated to 2005 version of cdt
January 26, 2010
	- Release 2.26.3
	- libcgraph.so   version bumped from 4 to 5 due to API changes
	- Allow ranksep to specify multiple radial differences in twopi
	- Allow the user to specify all pairwise distances in neato with
	- Fixed bugs: 1280 1409 1567 1583 1624 1631 1655 1708 1709
	1727 1784 1792 1798 1800 1813 1814 1830 1831 1833 1836 1839
model=mds
December 10, 2009
	- Release 2.26.0
	- Core features:
		- added: "smyrna" - a new opengl-based viewer for large graphs
		- added: rudimentary "gml2gv", "gv2gml" converters
		- extended support for various image formats in node images
		- removed vestiges of codegens, now all putput formats supported
		  through plugins.  Dropped some output formats for which
		  plugins have not been developed: -Tdia, -Tmif
		- gvpr converted to a library; additional array handling and
		  text processing functions added; language extended to allow
		  multiple BEG_G/N/E blocks.
		- allow background images specified via xdot
	- Ports added/dropped from nightly builds:
	  (The dropped ports could probably be re-added if there was demand.)
		- added MacOSX SnowLeopard  (multiarch:  i386/x86_64/ppc)
		- added Fedora 12 (i386, x86_64)
		- added Fedora 13 (Rawhide) (i386, x86_64)
		- dropped Fedora 7 (i386, x86_64)
		- dropped Fedora 8 (i386, x86_64)
		- dropped RHEL 3 (i386, x86_64, ia64)
		- dropped Ubuntu 8 (i386)
	- Fixed bugs: 1683 1713 1718 1720 1738 1747 1759 1770 1776 1786
	  1799 1816 1827

June 16, 2009
	- Release 2.24.0
	- Core:
		- add new layout engine for large graphs: sfdp
		- add new layout engine for nested graphs: osage
        - pack library extended to handle array-based packing modes
          using array bounds, aspect ratio, user-controlled sorting, etc.
	- Fixed bugs: 1515 1590 1598 1601 1605 1607 1609 1610 1611 1614
	1615 1617 1625 1628 1634 1635 1640 1641 1642 1646 1649 1651 1652

March 13, 2009
	- Release 2.22.2
		- fix for buffer overflow (present in 2.22.0 and 2.22.1)
	- Fixed bugs:
		1602

March 9, 2009
	- Release 2.22.1
		- build fixes for Visual Studio and for FreeBSD
March 3, 2009
	- Release 2.22.0
	- Core:
		- libgvc api changed, version bumped.  Affects third party
		  applications using libgvc.
		- plugin api changed, version bumped.  Affects third party
		  plugins for graphviz.
		- 90% conversion to cgraph has been done, but not enabled yet,
		  (and yes, its true what they say about the last 10% )
		- drop libagraph from distribution  (use libcgraph)
		- layout code completely converted to floating point.
		- new "dot -P" option for generating a graph of available
		  plugins.
		- registered MIME type:  text/vnd.graphviz for .gv files
		- rename files from .dot to .gv to avoid conflict with
		  Word templates.  .dot still supported, but deprecated.
		- new command: mm2gv   (matrix-market graph file conversion)
		- rename commands:	dot2gxl -> gv2gxl
					gxl2dot -> gxl2gv
	- Plugins:
		- new rsvg plugin for support of node shapes in SVG format
		- new gs plugin for support of node shapes in PS format
		- new lasi plugin for support of UTF-8 characters in PS output
		  (the above thee plugins are Linux only, at the moment)
		- new quartz plugin (MacOSx only)
		- new gdiplus plugin (Windows only)
		- new -Tvml support in core plugin (thanks Steve Roush)
		- new -Ttk support in core plugin (also used by Tcldot and
		  gv_tcl language bindings.)
		- disabled old style codegens completely
	- Linux:
		- new Ubuntu8 builds
		- new Fedora 10 and 11 builds
	- MacOSx:
		- Universal binary for Leopard: i386, x86_64, ppc, ppc64
		- Should not conflict with parallel install of MacPorts
		  version of graphviz
		- Improved GUI
	- Windows:
		- VisualC project files now available, in addition to the GNU
		  Makefiles that are used the mingw builds.
	- Language Bindings:
		- fixed problem with writing dot, xdot, plain, canon to
		  memory or to Tcl_Channels
		- renamed man pages to Debian style:  gv.3tcl, gv.3perl, etc
	- Fixed bugs: 827 1365 1366 1367 1368 1374 1375 1376 1378 1380 1382
	1383 1385 1386 1388 1390 1391 1392 1394 1395 1397 1398 1399 1405
	1407 1410 1412 1414 1415 1416 1421 1424 1425 1427 1429 1431 1433
	1435 1436 1437 1438 1440 1441 1444 1446 1451 1452 1453 1456 1457
	1459 1460 1461 1462 1463 1464 1465 1466 1470 1474 1475 1476 1477
	1478 1484 1485 1489 1490 1492 1493 1495 1496 1499 1500 1501 1502
	1503 1505 1509 1513 1521 1523 1525 1530 1531 1532 1533 1535 1536
	1539 1540 1542 1543 1546 1547 1551 1553 1554 1561 1565 1566 1568
	1569 1570 1571 1573 1577 1578 1579 1580 1581 1582 1584 1586

June 25, 2008
	- Release 2.20.2
	- Fix bug in HTML-like labels
June 23, 2008
	- Release 2.20.1
	- Fix bug in ccomps related to conversion to cgraph
June 20, 2008
	- Release 2.20.0
	- Preparing for Release 2.20
	- Fixed bugs: 1315, 1317, 1324, 1336, 1343, 1364
	- Add new "folder" shape for nodes.
	- Migration of gvpr tools to libcgraph.
	- New output format -Teps  (encapsulated postscript)
	- Various NetBSD and SuSE fixes incorporated
	- ./configure now provides a summary
	- RPM specfile updates for fedora-10 (no more string comparisons)
	- Add MacOS support (Glen Low)
March 10, 2008
	- Release 2.18
	- Fixed bugs: 1249 1255 1256 1268 1276 1289 1295 1300
		Fedora BZ#247376,
	- in -Tps use a new number formatter that suppresses trailing 0.
	- support tcl/tk-8.5
	- support gcc-4.3
	- support for node usershapes/images in svg format (thanks Alex Poylisher)
	- install: perl, php, python, ruby, tcl, bindings in language-specified directories
	- add arrowhead scaling with edge penwidth
	- add "folder" node shape (thanks Pander)
	- many windows and mac fixes (thanks Glen)
	- add "smyna" large graph view (thanks Arif) (not yet included in binary distros)
December 12, 2007
	- Release 2.16.1
	- Fixed bugs: 1228 1234 1238 1239 1245
	- Improvements to PHP binding
	- Improvements to OCAML binding
	- Make regression tests run from the build tree, rather than require installation
	- Repair freetype detection on RedHat-7 (Yes, people still use it!!)
	- Fix zoom-at-mouse-location in -Txlib and -Tgtk
	- Fix some dotty regressions
November 9, 2007
	- Release 2.16
	- Fixed bugs: 456 473 1021 1153 1154 1155 1159 1160 1162 1165 1166
	1168 1169 1170 1172 1173 1174 1175 1177 1178 1179 1181 1182 1183
	1185 1187 1189 1192 1193 1195 1196 1199 1204 1207 1210 1215 1216
	1217 1218 1219 1220 1223
	- new regression test suite
	- new cgraph library (will eventually replace graph and agraph)
	- add "image" and "imagescale" for simpler support for images in nodes
	- add "tab" "box3d" and "component" shapes.  - Diomidis Spinellis
	- replace arith.h in distro
	- add functions to access version info to avoid need for gvcint.h
	- Fix problem with irregular character spacing at 96dpi in pango/cairo output formats.
	- Add gdk_pixbuf plugin providing: .bmp .ico .jpg .png .tif
	- Add DevIL plugin providing: .bmp .jpg .png .tif .tga
	- Extend GD plugin to provide a backend to cairo for: .gif .jpg .png .gd .gd2 .wbmp  <- gifs are now antialiased
	- Rework plugin framework to separate device from renderer, and to autoload load dependendent plugins
	- show defaults in output from: ./configure --help
	- add more info to dot -v  and dot -v2 debug outputs
	- various issues with CR/LF in windows, but not in binary outputs.
August 15, 2007
	- release 2.14.1
	- Fixed bugs: 1163, 1167
	- Windows build fixes
	- Add xdot parsing library to source distros
	- graphviz.spec fixes for rpm distros from Gareth Armstrong
	- moved language binding man pages to mann (gv_php.n, gv_ocaml.n, etc.)
	- New access functions for version info in GVC_t - permits gvcint.h to
	be private.
August 2, 2007
	- release 2.14
	- Fixed (or otherwise closed) bugs:
		74 130 162 184 190 197 219 223 281 295 311 316
		324 352 364 385 393 404 420 447 455 474 489 507
		530 532 537 543 551 564 571 574 577 583 587 588
		590 592 595 599 638 647 650 660 675 667 668 669
		676 684 685 686 721 725 734 740 746 747 748 749
		752 755 756 765 778 780 781 782 785 794 803 814
		822 828 836 840 847 852 862 866 868 893 928 944
		948 950 955 961 976 985 992 1024 1057 1064 1065
		1066 1069 1072 1074 1079 1085 1086 1089 1091 1092
		1093 1094 1096 1107 1111 1123 1124 1130 1138 1145
		1151 1152 1156
	- Fixed Redhat bugs: 218191 237497
	- Fixed Debian bugs: 321128 422862 422873
	- Fixed Gentoo bugs: 173676
	- Using system version of libgd if gd-2.0.34 or later. (Fedora 7 and 8 distros)
	        internal copy of gd updated to gd-2.0.35.
	- Updated GVGUI viewer for Windows
	- Windows build process now uses GNU autoconf and UWIN
	- Added support for selection of edge routing types:
		line, polyline, orthogonal, spline
	- Added -Tvml support
December 5, 2006
	- release 2.12
	- Bug fix release for 2.10
	- The gd plugin for font handlers was not being used at all if the build
	did not use fontconfig, e.g., on Windows. In addition, the code had
	dropped the name mapping to Windows font names.
	- PostScript output had an extraneous '%' character on the first line,
	which would cause printing to fail.
	- Text handling, during both sizing and layout, incorrectly handled
	empty lines such as label="\nabc".
	- HTML-like tables had been changed to use too much vertical space,
	to possibly use the wrong font in calculating the height of a line,
	and to use the wrong offset when moving the baseline from one line to
	the next.
November 27, 2006
	- release 2.10
	- dot - New pango+cairo renderer plugin (was in separate graphviz-cairo tree).
	  -- -Tpng now uses cairo   (-Tpng:gd for old gd based renderer)
	  -- -Tpdf now available
	  -- -Tps:cairo now available (-Tps is a direct ps renderer not based on cairo)
	  -- -Tsvg:cairo now available (-Tsvg is a direct svg renderer not based on cairo)
	  -- -Txlib now available -- "dot -Tx11 foo.dot"  watches foo.dot with inotify and updates
	  -- -Tgtk now available -- eventually to provide a graph editing capability - not fully working
	  -- -Tswf "Flash" now available using the ming library. Currently has incomplete font support and not yet in Fedora rpms because ming not yet available as rpm.
	- remove hard gd dependencies from dot.  gd renderers now provided
	  as optional plugin.   Deprecated, but required for -Tjpg, -Tgif and -Tvrml.
	- gvpr - Add kindOf function, plus functions to set and get default values
	- dot - Implement esep attribute to allow graph to specify room
	around nodes for spline routing.
	- neato - add vpsc library and DIGCOLA
	- neato - add IPSEPCOLA additions from Tim Dwyer
	- move: -Tps, -Tfig, -Tsvg, -Timap/ismap/cmap/cmapx, -Tdot/xdot,
	from codegens to a "core" plugin.
	- dot - new usershape plugin mechanism potentially supporting
	  a wider range of input shape format -> output format combinations.
	display on changes
	- Fixes for builds on Mac OS/X
	- dot - new -O switch to automatically generate output file
	names based on the input filename and the -T value.
	 e.g.  "dot -Tpng -O *.dot"
	Also works for case of multiple graphs in a single input file.
	- add support for "Brewer" color nameset
	- move reusable .so libraries to $PREFIX/lib per frequent request
	from Debian community.   Plugin .so's remain in $PREFIX/lib/graphviz.
	- Fix bugs 882 884 886 896 902 905 906 911 918 919 933 936 938 940
	   948 955 958 967 979 987 993 1005 1006 1011 1012 1013 1014 1016
	   1018 1025 1030 1034 1035 1039 1040 debian#37300

February 3, 2006
	- release 2.8
	- (POTENTIAL INCOMPATIBILITY) The default input scaling, in the
	absence of a "-s" switch, has been changed from inches to points.
	The new behavior of "neato" is equivalent to "neato -s72".
	The old behavior can be restored with "neato -s1".
	The purpose of this change is to avoid a Frequently-Made-Mistake
	when using "neato -n" to process a previously generated layout.
	Previously it was necessary to use "neato -n -s72", but with this
	change the default matches dot's output and the "-s72" is not required.
	- Added pseudo layout engines: "dot -Knop" and dot -Knop1" equivalent
	to "neato -n"
	- Added pseodo layout engine: "dot -Knop2" equivalent to "neato -n2"
	- Add support for color namespaces; add Brewer color data
	- Add support for simulated duplex edges using parallel edges:
	head arrow takes first color, tail arrow takes second color.
	- source code management moved back to CVS until GIT matures a bit more
	- distribute separe rpms for binares of language bindings :
	- Add a small pad region around graph renderings to allow for finite
	penwidths at the drawing edges
	- Add protonode(g) and E=protoedge(g) functions to simplify
	language bindings.
	- Add special purpose code to deal with html labels from language
	bindings.
	- Various portability fixes for: HPUX, Mac OS/X, Cygwin, Windows.
	- Fix bugs 784 786 787 788 789 790 791 793 795 796 798 799
	    800 801 804 806 811 812 817 820 821 823 824 825 830
	    837 839 841 842 843 848 850 851 854 855 856 857 858
	    859 861 863 866 867 869 872 874 876 877

August 28, 2005
	- release 2.6
	- experimentally moved source code management from CVS to GIT
	- added iterator functions to script bindings
	- more C-API tuning
	- add "-c" switch to dot to explicitly generate plugin "config" file
		instead of generating it as a side-effect of "dot -V"
	- better support for binary relocation.
	- plugin versioning and version checking
	- clean up of header files
	- provide statically linked "dot_static" (not incl. in rpms)
	- additional "event" support for GUIs (e.g. "DotEdit" graphviz-cairo)
	- add some information about plugins to "dot -v" output.
	- lefty/dotty fixes
	- fix bugs 746 750 752 753 754 756 761 763 764 765 768
		771 772 773 774 775 776 777 778
	- not a bug 757 760 770
July 20, 2005
	- release 2.4
	- major code restructuring
	- new plugin architecture (e.g. see separate package: graphviz-cairo )
	- new script-language bindings using swig (perl, ruby, python, tcl, java ... )
	- C-API now in libgvc (no more dotneato.[ch] or dotneato-config.sh]
	- pkgconfig now used for reusable libraries
	- lefty upgrade
	- fix bugs 156 255 492 631 641 647 659 662 665 670 690 691
			701 702 703 705 730 731 732 741 743
April 7, 2005
	- release 2.2.1
	- correct license headers to CPL in .cpp files
	- undo indentation cleanup to dynagraph .h files
	- fix bugs: 183 247 419 615 616 625 626 627 643
		646 651 658 661 664 674
	- fix buffer overrun in Gvfilepath construction
January 19, 2005
	- release 2.2
	- fix bugs: 86 345 517 579 580 597 600 601 604
	- use the original cpl1.0.txt as the license master, instead of CPL.html        - fix for bug generating in memory bitmaps that was affecting webdot
	- fixes for windows builds
	- documentation updates
December 11, 2004
	- release 2.0
	- new CPL license
	- re indent all sources
December 11, 2004
	- release 1.18
	dotneato
	- fix bugs: 451 536 545 547 548 559 561 565 572
	- increase max size  of HTML tables.
	- spline cluster edges in fdp
	- center userimages in nodes
	- support user images in HTML table cells
	- syntax extension for node:port:compass as well as node:compass
	- FreeBSD fixes
	- sync with gd-2.0.32
	- attempt to catch some out-of-memory conditions with very large graphs
	- support background and node-fill partial transparency when truecolor=true

September 14, 2004
	- release 1.16
	dotneato
	- fix bugs: 275 523 526 527 529 534
August 30, 2004
	- release 1.14
    dotneato
	- the official gd now has support support for GIFs again - the
		internal gd is now closely sync'ed with the official version
		and will eventually be removed in favor of using a
		separate installation of the official version.
	- gd has new support for FontConfig (thanks to Dag Lem)
		NB. the fontname attribute in graphs is now a font pattern
		as understood by fontconfig (e.g. fontname="Times-Italic"),
		unless it contains a '/' in which case it is interpreted as
		a font path as before.
	- gd provides support for html4 entities in decimal, hex or named, e.g "&lt;"
	- "dot -v" debugging output now reports fontname -> fontpath resolutions

	- PostScript generated by -Tps now uses "xshow" operator for strings
		for better matching of bitmap and PostScript outputs.

	- ability to use an external gd-2.0.29 version of libgd (EXPERIMENTAL)

	- new feature: parallel edges by using a ":" separated list of edge colors
	- new feature: rankdir=BT and rankdir=RL  (thanks to Dag Lem)

	- new layout engine: fdp - force directed placement (EXPERIMENTAL)
		a neato-like undirected layout engine that produces
		clustered symmetric layouts.
		Supports edges between clusters and nodes.

	- updated neato engine: now using stress majorization as the default,
		which avoids the potential for cycling
	- model=subset in neato provides a third distance function, where
		two nodes sharing many nodes will be place farther apart
	- shape=none now equivalent to shape=plaintext
	- fix label justification with \l and \r
	- first cut at <FONT> support added to html labels
	- various color transparency fixes
	- various fixes for UTF8 and Latin[12] character encodings.
	- various cluster fixes.
	- improved hyperlink support in -Tsvg
	- support tooltips on clusters in client-side imagemaps

    gvpr
	- add support for scanf and friends

    general
	- greater use of shared libraries.
	- pkg-config files provided for shared libraries (EXPERIMENTAL)
	- "./configure --disable-shared --enable-static" works if needed
	- C++ wrappers on all header files (thanks to Victor Wodecki)
	- various configuration and portablity fixes
	- provide pdf version of man pages
	- Windows package provides graphviz libraries and header files
	- Closed bugs: 195 198 234 321 330 399 401 406 410 411
		412 413 415 416 417 423 424 427 430 431 433 434 435
		438 441 442 444 445 449 450 452 454 457 458 462 463
		464 467 468 469 471 475 480 482 485 495 496 498 499
		500 501 504 508 511 512 514

March 5, 2004
    - added glyphwidths.ps support utility

March 1, 2004
    - release 1.12
    - general
	- rename bcc -> bcomps to avoid name conflict with "Bruce's C Compiler"
		on Redhat distributions.
	- all build without X11 (fix problem in lefty tree)
	- remove from distribution:
		dag, fdp, geo, grid, incr, shape, tcldgr, tcldgl
    - dotneato
	- fix "brown-bag" problem resulting in PNG and JPEG errors on RH8 and RH9.
February 23, 2004
    - release 1.11
    - general
	- fix windows builds
	- add tool "bcc" to distribution
    - dotneato
	- add -Gviewport="X,Y,Z,x,y"  where XY are the dimensions of a viewport
	  in device coordinates (pixels), Z is a zooming factor, x,y is the
	  location of the center of the viewport in graph coordinates.
	  Supported in bitmap and imagemap outputs only.
	- fix memory leak in gd/gdft.c
	- clean up calculation of whitespace around labels
    - dotty, lefty
	- fix for bug #400
December 23, 2003
	- added dijkstra (single source distance) filter
September 10, 2003
    - general
	- removed CVS directories from .tar.gz distributions
	- add "config" directory to contain some of the autoconf clutter
	- only remove flex products with "make maintainer-clean" to
	  avoid trying to regenerate them after "make distclean"
	  basically this is to avoid the broken flex on Debian.
	- suppress complaints from ./configure about config.rpath
	- doc/build.html updated with notes about Windows builds
	- build fixes for Forte 6sp2 compiler on Sun -xarch=v9a (64bit)
	- build fixes for OpenBSD
	- improved configure testing for Tcl/Tk
	- various bug fixes, internal restructuring, etc
    - dotneato
	- fix problem with extra escape chars in .fig output
	- support for "setlinewidth" in -Tfig
	- improved splines in -Tfig
	- add manpage for dotneato-config
	- neato: add defaultdist graph attribute to set distance
	  between components
	- first cut at html table formatter add. not ready for use yet
	  as the syntax is going to change some more.
    - tools
	- renamed "colorize" to "gvcolor" to avoid conflict on Debian
	- renamed "gpr" to "gvpr" to avoid conflict on Debian
	- add fflush() to acyclic, ccomps, gvcolor, tred, dot2gxl
	  to try to fix truncated output when used in php or perl cgi scripts
July 9, 2003
	- rerelease 1.10 with ast_common.h fix in -devel rpms
July 3, 2003
	- declare this version 1.10
	- general
	    - "mkdir obj;cd obj;../configure;make"   now works (bug #293)
	    - "make prefix=xxx"   now works (bug #274)
	    - "--with-wish=xxx"   now works (bug #270)
	    - remove generated file: ast_common.h from source distributions
	    - make GIF support configurable
	    - added .cvsignore throughout source tree to reduce CVS noise
	    - FAQ updates
	    - documentation updates for gpr
	    - improve portability of dotneato-config, but requires libtool now
	    - improvements to error processing for library users
	-gd
	    - sync with gd-2.0.15
	    - optimize line drawing code
	- dot, neato, twopi
	    - fix bugs 240 270 274 293 298 303
	    - support "peripheries=0" without crashing
	    - add support for "dia" output format (-Tdia)
	    - espf fixes (use of showpage)
	    - svg fixes (coordinates and viewBox)
	    - ismap/imap, fixes (quoting of label strings)
	    - fix to "point" shape
	    - improve (m|c|re)alloc usage
	    - improve handling of very-small fonts in bitmap outputs.
	    - various fixes for multiple -T -o feature
	    - add support for splines to records and ports (neato)
	    - various improvements to libpack
	    - dot_init_graph and neato_init_graph external for library users
	    - cluster improvements (neato)
	    - fix support for truecolor
	    - normalize splines so that they now always go from tail to head
	    - add some simple help text for any unrecognized option
		(e.g. -?  -h  --help)
	- tools
	    - extend gpr language to allow access to command-line arguments
	    - add sqrt() function to gpr
	    - add new tool - gvpack
	- tcldot
	    - use .dll extension if on windows
	    - doted demo
		- use tcl's file requestor instead of homebrew
		- add zooming controlled by mousewheel
		- support additional export formats

January 31, 2003
	- declare this version 1.9
		(3-level version numbering has been dropped now
		that we have nightly snapshot builds with their
		own extended numbering.)
	- general
	    - config.h is no longer installed.  config.h is generated by
		./configure for the current build only.  It may not be
		applicable for derivative builds.
	    - improve ICONV configure tests
	    - lots of janitor-work to clean up warning messages from -Wall
	    - use @OBJEXT@ in Makefile.am so that .obj is used under cygwin
	    - fixes for Solaris builds
	    - use libpng-config if available
	    - reduce long build times due to touching ast_common.h too often
	    - improve dependency tracking.  "make -j8" now works with distcc
	    - autogen.sh fixes to work on RH7.3, RH8.0, and Solaris.
	    - eliminate use of suffix rules which confused some makes.
	    - DOT language allows '+' for concatenation of quoted strings
	- dot, neato, twopi
	    - fix bugs 209 210 214 216 217 222 224 225 229
			230 233 236 237
	    - update gd into alignment with gd-2.0.9
	    - change to make libagraph output compatible with libgraph input
	    - add shapes: septagon, pentagon, a_ediamond, rect, rectangle
	    - introduce "ND_...", "ED_...", "GD_...", node/edge/graph-data
		accessor macros in partial preparation for use of
		libagraph in dot.
	    - add libdotneato.so, dotneato.h, dotneato-config
		to aid use of dot libraries by user apps based
	        on installed graphviz-devel rpm and without access
		to graphviz sources.
	    - new xdot output format providing detailed drawing instructions
	    - new -y command line flag, inverts y coordinates
	    - support multiple -T when -o given, as in:
			cat xxx.dot | dot -Tpng -Tcmap -o xxx
		which produces xxx.png and xxx.cmap from a single
		layout computation.   Intended for use in CGI programs.
	- agraph
	    - correct callback ordering for deletions
	- tools
	    - add gxl2dot and dot2gxl for GXL language conversions
	    - gvui now provides *map output
	- tcldot, tcldgr, tcldgl
	    - improve tcl8.4 support
	    - extend search path for tcl.h to include /usr/local/include/tcl8.4/
		in support of BSD install conventions.
	- dynagraph
	    - many fixes
	    - change to not build dynagraph by default (use --with-dynagraph)
	- docs
	    - dotguide updates
September 27, 2002
		- declare this version 1.8.10
	- general
	    - various configure.in fixes and simplifications
	    - change configure to now build dynagraph by default
	    	"--without-dynagraph" is supported
	    - fix graphviz.spec.in to partition packages properly
	    	graphviz no longer depends on graphviz-tcl.
	    -  Makefile.old cleanups
	    - configure.old now set version number automatically from
	      configure.in
	- dot, neato, twopi
	    - Initial support for image node shapes + URL fetch.
	    - Made number of dimensions a runtime variable in neato.
	    - Bug fix in vrmlgen for degenerate splines.
	    - Bug fix - ordering=in should now work
	    - Bug fix - layers no numbered from 0 to match PS requirements
	    - Bug fix - don't draw arrows on invisible edges
	    - Bug fix - when pack=true and ratio is set
	    - Bug fix - agraph/scan.l to work with latest flex beta

August 2, 2002
		- declare this version 1.8.9
	- general
	    - split rpm into:
	        graphviz, graphviz-tcl, graphviz-graphs, graphviz-devel
	    - gcc3 warning cleanup
	    - Install lincdt, libgraph, libagraph, libgd, libpathplan, libexp,
		and libpack so that they can be used by other programs.
		Headers and man3 in graphviz-devel
	- dynagraph, graphsearch
 	    - New tools based on libagraph and written in C++
	- dot, neato, twopi
	    - Add node and edge tooltips for use with -Tcmap
	    	\N,\E,\H,\T substitutions also work in tooltips.
	    - Add alt="label_string" to -Tcmap
	    - Add edge-label and port mappings to -Tps and -Tps2 so
	        that edges can be hyperlinked in PDF documents.
	    - Add support for \E (edge name), \H (head-node name),
	        \T (tail-node name) substitutions in edge labels and edge URLs
	    - Add support for stylesheet="file.css" for use in -Tsvg
	    - Fix -Tpic to work with recent gpic (Bruce Lilly)
	    - Fix alignment of imagemaps to images.
	    - Fix "transparent" color support in -Tsvg
	    - Fix support for graph [URL="default.html"] in -Tsvg and -Tcmap.
	    - Fix '&' escaping in URLs in -Tsvg
	    - Fix infinite loop in dot layout algorithm
	    - Fix text rotations again (hopefully freetype is stable now.)
	    - Cluster layout improvements
	    - Clean up warning messages from pathplan
	    - Consolidation of mapping code from imapgen.c and ismapgen.c into mapgen.c
	- gpr
	    - Added additional mode to extract components based sharing an
	        edge or a cluster
	    - Fix test for getopt
	- tcl-based tools
	    - Disable tcl-based tool building if tcl/tk not available
	        with stubs support.
	- documentation updates: FAQ, dotguide, dot.1
July 5, 2002
	    - declare 1.8.7 a "brown bag" release
		 and declare this version 1.8.8
	- remove wrong assert in gdgen.c
	- fix graph centering in bitmap outputs
	- provide enough margins
	- fix line widths after scaling
		(test with directed/proc3d.dot)
	- fix text rotations (requires libfreetype.so.6.3.1)
		(test with directed/NaN.dot)
July 5, 2002
	    - declare this version 1.8.7
	- Fix missing "]" in ihi demo.
July 2, 2002
	- Add URL mappings for clusters: svg,svgz,ps,ismap,imap,cmap.
	- Fix to avoid white edges in bitmap outputs when bgcolor is set.
	- Improve sizing and position of strings in bitmap outputs
	  when using builtin fonts (when font file not found).
	- Fix \N substitution in edge URLs in imap and cmap outputs.
	- Add -Tcmap for client-side imagemaps.
	- Generate warnings instead of access violation for EPSF file problems.
	- Various spline fixes in neato.
	- Fixes to pack.c
	- Add feature to ccomps to allow extraction of individual component
	  by number or node.
	- Cdt make to use iffe provided in the tools directory.
	- Various Makefile.old fixes.
	- Use HAVE_LIBZ to remove GD2 format if libz not available.
	  Now bare-bones programs can be built without any add-on libraries.
	- Modified dot grammar to allow simple name attributes in attribute
	  lists.  Thus, [splines] is equivalent to [splines=true]. Adopted
	  the same convention for command line attributes -G, -E and -N.
	  In addition, such command line attributes now override any
	  competing initial attribute statements.
	- HP-UX 11.11 build fixes for struct dioattr.
	- Fix for bug #158 "Nodes disappear with ports"
	- Various Windows-specific #ifdefs
	- Fix edge coordinates in -Tplain.

May 24, 2002
	    - declare this version 1.8.6
May 19, 2002
	- Fixed segfault from use of bgcolor in clusters.
May 15, 2002
	- Changed install location of architecture-independent demo
	  scripts and graphs to <prefix>/share/graphviz/ to conform to FHS.
	- Avoid multiple linking of libfreetype (and others) which caused
	  problems on SunOS-2.8.
May 6, 2002
	- Factored out some duplicated arrow code from dotgen/splines.c
	  and neatorgen/splines.c into common/arrows.c.
	- Added new arrow types:  halfopen, box, obox, crow.
	- Touched up the arrow designs so that they look better at default size.
	- Modified/extended graphs/directed/newarrows.dot to show new arrows.
May 3, 2002
        - Added some UML arrow types from Diomidis Spinellis <dds@aueb.gr>
	  empty, invempty, open, diamond, odiamond.
May 2, 2002
	- Added new pack option to neato. This causes each connected component
	  to be laid out separately, and then the resulting graphs are packed
	  together in a single layout.
	- Amended neato to accept new tee arrowhead.
April 19, 2002
	- Coords of rectangles changed to left/top right/bottom in -Timap.
	- Generate COPYING from LICENSE.html during ./authogen.sh,
	  remove COPYING from CVS.
April 16, 2002
	- Minor license file patches.
	- Corrected one of those reversed flat edge bugs again.

April 11, 2002
	     - declared this version 1.8.5
	- various portability fixes
	- various SVG fixes and optimizations
April 5, 2002:
	     - declared this version 1.8.4
	- SVG renderer:
		- make graph|node|edge ids unique, particularly for multiedges
		- put graph|node|edge names in <title>...</title>
		- use some property inheritance to reduce size of output
		- fix compile errors when no zlib
		- updated DTD reference
	- GD renderer:
		- Minimal Type1 font support:
			- look in /usr/lib/X11/fonts/Type1/
			- look for .pfa or .pfb font files based on fontname
		- run gdgen.c through dos2unix - problems with gcc on SuSE
	- fix Mac-OSX build problems:
		- improve strto[u]ll configure tests
		- add -fno-common for extern problem
		- function renamed to avoid conflicts (vis -> visibility)
		- add configure tests for search.h, malloc.h, getopt.h, errno.h
		- improve configure tests for FILE struct features
		- add configure tests for lrand48
	- add new demo graphs:
		- graphs/undirected/Heawood.dot
		- graphs/undirected/Petersen.dot
	- neato:
		- fix for -x implementation in neato (Bug 77)
		- fix spline problem (Bug 87)
		- fix some divide-by-zero problems
	- twopi:
		- fix Bug 117
		- update man pages for unconnected graphs capability
	- added arrowhead or arrowtail = tee
March 22, 2002:
	- add dotneato/pack code to twopi
	- add contrib/prune to gnu build and install
March 20, 2002:
	    - declared this version 1.8.3
	- fixed parse error for lines starting with '#' in .dot files
	- fixed a recently introduced bug that caused failure of:
		digraph G {  {rank = same;  A -> B; B -> A } }
	- updated DOCTYPE header in SVG outputs
	- added dotneato/common/xbuf.[ch] for dynamic string handling
	  to avoid sprintf buffer overruns.
	- twopigen - handle special case of graphs with < 3 nodes.
	- neato - handle point shapes
	- added fontcolor support to svg
March 14, 2002:
	- Fixed bug 109
	- Removed duplicate definitions for str[n]casecmp
	- Added missing declarations needed for Windows
	- Cleaned up warning messages from set but unused variables
	- Removed use of DOS preprocessor variable; uniformly replaced by MSWIN32
March 8, 2002:
	- declared this version 1.8.2
    - Mainly to fix a missed static buffer problem which trips up the
      Windows community
March 1, 2002:
	- declared this version 1.8.1
    - Bug fixes reported from user testing of 1.8.0, especially problem
      with SVG output
February 25, 2002:
	- updated dotguide.tex and moved to LaTeX article format
	- added webdot.cgi perl script, enhanced to accept the same
	    argument format as John's tcl version (so it can also
	    serve neato and twopi graph layouts).

February 7, 2002: graphviz-1.8.0 pre
	- declared this version 1.8.0

February 5, 2002: graphviz-1.7.17-0
    - various 64bit portability fixes
    - various bug fixes
January 2, 2002: graphviz-1.7.16-0
    - dotneato
	- fix bugs in -Tps output due to pen/fill color changes
	- various -Tfig.c fixes
	- various portability fixes
December 28, 2001: graphviz-1.7.15-0
    -dotneato
        - introduce damping factor into neato's solver
        - clean up pencolor v fillcolor code so that filled polygons are drawn
		just once if the renderer is capable (e.g. svg, fig)
        - complete -Tfig support (xfig format)
December 11, 2001: graphviz-1.7.14-0
    -dotneato
	- add -Tsvgz (compressed SVG) support
December 11, 2001: graphviz-1.7.13-0
    - dotneato
        - fontwidth fixes
	- remove some potential buffer overruns
	- escape '&' in SVG, unless it is already part of a UTF entity sequence
	- recognize Times_New_Roman and Courier_New as default font names.
	- improve -liconv support in configure
	- clean up some compiler warnings
    - dynagraph
	- change "round" to "ROUND" to avoid conflict with system headers on linux
December 03, 2001: graphviz-1.7.12-0
    - dotneato
        - add -Tplain-ext which includes port identifiers edge records
	- escape '>' with '&gt;' in edge ids and edge URLs in -Tsvg.
	- spline fixes
	- mincross fixes
	- improved text alignment in nodes - particularly in bitmap outputs.
	- fixed text scaling problems for 8-bit characters (e.g. umlauts)
	- add graph lexer and postscript support for extended characters
    - lefty
        - fix for X11 displays
    - pathplan
        - added workaround for gcc-0.96 bug when "-O2 -mcpu=686 -ffast-math"
October 22, 2001: graphviz-1.7.11-0
    - dotneato
	- svg - fix landscape "y" direction
	      - fix text rotation (works in batik, not yet in sodipodi or amaya)
	      - fix linewidth
	      - fix xmnls:xlink reference
    - doc
	- Dot.ref - updated
    - graphs/directed
        - newarrows.dot expanded
	- honda-tokoro.dot added
October 21, 2001: graphviz-1.7.10-0
    - lefty & dotty
	- realign code with EK's master tree.
	  includes fix for dirty trails when dragging nodes in dotty.
    - dotneato
	- svg - kludge escape of "<" & ">" characters in labels.
    - general
	- generate doxygen documentation on http://www.graphviz.org/
August 20, 2001: graphviz-1.7.9-0
    - general
	- first release from relocated cvs server
    - dotneato
        - fix for abort from spline code
        - fix for crash from gd tiling code
August 15, 2001: graphviz-1.7.8-0
    - general
        - Update gd to gd-2.0.1 with extensions
    - dotneato
        - more spline fixes
        - add suport for "#rgb" color specification
        - add twopi layout engine (circular layouts)
July 13, 2001: graphviz-1.7.7-0
    - Synchronization release prior to relocating CVS server.
    - general
    	- some Makefile fixes for OpenBSD
	- some FAQ updates
    - dotneato
        - self-edge fixes
        - spline fixes
    - libgraph
        - parser fixes
July 1, 2001: graphviz-1.7.6-3
    - general
	- portability fixes (including 14 charater file names !)
	- memory leak fixes
	- "make test" targets in graphs/directed, graphs/undirected
    - configure
	- add support for building without X11, Tk, Tcl
	- add hooks for dmalloc and ElectricFence debugging
    - dotneato
	- spline fixes
	- cluster fixes
	- fix label centering
	- fix support for graph margins in bitmapped outputs
	- correction to PostScript preamble
	- SVG generator improvement - now works with Amaya and SodiPodi
    - tcldot
	- now uses Tcl Channels properly for input
	- fixes for linewidth support
	- command extensions
	    - listattributes now accepts list
	    - queryattributes now accepts list
	    - setattributes now accepts list
	    - queryattributevalues - new command
		- generates list of pairs compatible with setattributes
    - dotty
	- passthrough keyboard events
    - doted
	- fix resizing problems
	- add PNG and SVG output formats

April 27, 2001: graphviz-1.7.6

    NEW FEATURES

    Added a collection of graph processing tools:

    acyclic : a filter that takes a directed graph as input
    and outputs a copy of the graph with sufficient edges
    reversed to make the graph acyclic.

    ccomps : decomposes graphs into their connected components,
    printing the components to standard output.

    colorize : is a filter that sets node colors from initial
    seed values. Colors flow along edges from tail to head.

    gc : a graph analogue to wc in that it prints to standard
    output the number of nodes, edges, connected components or
    clusters contained in the input files.

    gpr : a graph stream editor inspired by awk. It copies
    input graphs to its output, possibly transforming their
    structure and attributes, creating new graphs, or
    printing arbitrary information.

    nop : reads a stream of graphs and prints each in
    pretty-printed (canonical) format on stdout.

    sccmap : decomposes digraphs into strongly connected components
    and an auxiliary map of the relationship between components.

    tred : computes the transitive reduction of directed graphs,
    and prints the resulting graphs to standard output. This
    removes edges implied by transitivity.

    unflatten : is a preprocessor to dot that is used to improve
    the aspect ratio of graphs having many leaves or disconnected
    nodes. The usual layout for such a graph is generally very
    wide or tall. unflatten inserts invisible edges or adjusts
    the minlen on edges to improve layout compaction.


    FIXES

    Add FAQ

    Change PNG default background color from transparent to white
    because of the difficulty some viewers have with transparency.

    Add support for [color=transparent]

    Fix broken support for specific capitalized fontnames
    (Times Helvetica Arial Courier)

    Fix broken support for DOTFONTPATH

    Some bitmap font scaling fixes - we're still not happy with
    bitmap font scaling as some labels still exceed the area
    allocated by the layout engines.

    Some -Timap fixes for mouse sensitive graphs on web pages

    Some cluster layout fixes

    Fix for [rankdir=LR] problems when using neato layout engine

    Some neato layout fixes

    Updates to unix.dot

    Various OS and distro fixes


December 23, 2000: graphviz-1.7.5

   - update to gd-1.8.4 and freetype2
   - add support for font paths


December 15, 2000: graphviz-1.7.4
    -various cluster fixes
    -separate support for node fillcolor from pencolor (see dot.1)
    -add support for dotted and dashed lines to bitmap renderers (PNG, GIF etc)
    -add support for varying linewidth to bitmap renderers
    -remove libtcldot dependence on lingdtclft (already statically included)
    -various fixes to build processes, GNU and non-GNU


graphviz-1.7.3 .....

May 3, 2000: removed webdot into its own CVS module and rpm package

April 16, 2000: Use check for "gdImagePng" to make sure that we have
   recent version of libgd.  <ellson@graphviz.org>

April 14, 2000: Add Tcldgl and dge demo <ellson@graphviz.org>

April 14, 2000: Add dynagraph libraries <north@research.att.com>

April 14, 2000: Flatten directory hierarchy of sources <ellson@graphviz.org>

April 14, 2000: Fix X11 library detection for lefty:
	src/configure.in, src/lefty/Makefile.in
   <ellson@graphviz.org>

April 14, 2000: Fix pic support:
	src/dotneato/picgen.c,
	src/dotneato/emit.c,
	webdot/tcl/webdot.tcl
   <Bruce Lilly>

April 7, 2000: Upgrade webdot installation process:
	webdot/Makefile, webdot/README
    <ellson@graphviz.org>

March 13, 2000: Support for virtual hosts in webdot/webdot.tcl, add
   "puts $skt "Host: $server"     Michael Tillberg <mt@proteome.com>

March 13, 2000: Fix to src/graph/parser.y line 149
   "if ((e->head == t->node) && !(Agraph_type & AGDIGRAPH)) {"
   Stephen North  <north@research.att.com>

March 13, 2000: Use AM_PROG_LIBTOOL instead of AC_PROG_LIBTOOL
   in configure.in.  John Ellson <ellson@graphviz.org>