[CMake] Fix dictionary depfile target under CMP0116 OLD - #23010
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[CMake] Fix dictionary depfile target under CMP0116 OLD#23010guitargeek wants to merge 1 commit into
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Follows up on ae4d830, which switched ROOT_GENERATE_DICTIONARY() from IMPLICIT_DEPENDS to a proper DEPFILE, but rebuilt every dictionary on every incremental build with older Ninja (e.g. 1.8.2 on Alma 8): ```txt ninja: expected depfile '.../io/io/G__RIO.depfile' to mention 'io/io/G__RIO.cxx', got 'G__RIO.cxx' ``` rootcling writes the depfile target as the plain dictionary name it is given (`"G__RIO.cxx"`) relative to CMAKE_CURRENT_BINARY_DIR. ROOT pins `CMP0116` to OLD globally (see 7392b02), and under OLD the Ninja generator consumes the depfile verbatim and expects the target relative to the top-level build directory (`"io/io/G__RIO.cxx"`). The mismatch makes older Ninja treat the dictionary as perpetually out of date; newer Ninja tolerates it, which is why the regression only showed up on some platforms. This commit suggests to enable CMP0116 NEW locally around the dictionary `add_custom_command` so CMake transforms the depfile to whatever the active generator needs.
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Superseded by #23011 |
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Follows up on ae4d830, which switched ROOT_GENERATE_DICTIONARY() from IMPLICIT_DEPENDS to a proper DEPFILE, but rebuilt every dictionary on every incremental build with older Ninja (e.g. 1.8.2 on Alma 8):
ninja: expected depfile '.../io/io/G__RIO.depfile' to mention 'io/io/G__RIO.cxx', got 'G__RIO.cxx'rootcling writes the depfile target as the plain dictionary name it is given (
"G__RIO.cxx") relative to CMAKE_CURRENT_BINARY_DIR. ROOT pinsCMP0116to OLD globally (see 7392b02), and under OLD the Ninja generator consumes the depfile verbatim and expects the target relative to the top-level build directory ("io/io/G__RIO.cxx"). The mismatch makes older Ninja treat the dictionary as perpetually out of date; newer Ninja tolerates it, which is why the regression only showed up on some platforms.This commit suggests to enable CMP0116 NEW locally around the dictionary
add_custom_commandso CMake transforms the depfile to whatever the active generator needs.