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GECODE_ENABLE_MIMALLOC=ONas a CMake option for Gecode heap and Space storage. A pinned, private mimalloc 3.5.3 build handles allocation throughgecodesupport; applicationmalloc, C++new, and standard containers keep their normal allocator. The system allocator is the default.Installed consumers need no mimalloc headers, library, preload setup, or redirect DLL. Rebuild consumers with matching configured headers and libraries when changing backends. This initial integration is CMake-only; sanitizer builds and peak-heap accounting use the system backend. Experimental search (#256) can use the option independently.
Shared/static package ownership and thread-transfer checks passed on macOS, Linux and Windows. Other checks cover CMake 3.21.4, hidden symbols, Linux late loading, a separate host allocator, ordinary DFS/BAB, and the default backend with ASan/UBSan. All allocator CI jobs enable integer variables. Independent Astra review and focused CI rechecks passed; the latest full CI run is in progress.