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7fec638222
CMake parses some paths from the spec of the C compiler, assuming it will be the linker, resulting in the link to end up with `-L/usr/lib/gcc/x86_64-w64-mingw32/12-win32` on debian bookworm if both -win32 and -posix variants are installed, and -win32 is the default alternative. This results in the wrong C++ library being linked, missing std::threads::hardware_concurrency and other threading functions. To fix this, use the -posix variant of gcc as well when available. This fixes a regression compared to autotools, where this scenario worked. Github-Pull: #31013 Rebased-From: ae56b3230b287eef5a5657d3089abebffde51484