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Add an optional scoped mimalloc allocator for shared builds - #258
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Add the opt-in CMake option
GECODE_ENABLE_MIMALLOCfor Gecode heap and Space storage. It embeds mimalloc 3.5.3 privately in sharedgecodesupport, without changing applicationmallocornew. Installed consumers need no mimalloc package. The system allocator is the default.The option requires
GECODE_BUILD_STATIC=OFFto avoid symbol conflicts with a host allocator. Shared Gecode can coexist with libminizinc's mimalloc. Static Gecode uses system allocation, which MiniZinc's process-wide replacement can also cover. Rebuild consumers when changing backends. Custom allocators, sanitizer builds, and peak-heap accounting are unsupported with this option.CI adds one Linux shared-library job for mimalloc, covering private symbols, installed-package allocation across libraries and threads, and coexistence with a host allocator. Local checks also passed on macOS.