It is because of this commit: https://gitlab.kitware.com/cmake/cmake/-/commit/aafa392c12f6fe04893bc5327af429f5321fbb9d @kanje It failed with both gcc and clang. Error message from gcc-11: ``` g++ -march=pentium4 -mtune=generic -O2 -pipe -ID:/M/msys64/mingw32/include -DCMAKE_BOOTSTRAP -DCMake_HAVE_CXX_MAKE_UNIQUE=1 -I/C/_/mingw-w64-cmake/src/build-MINGW32/Bootstrap.cmk -I/C/_/mingw-w64-cmake/src/cmake-3.22.0-rc2/Source -I/C/_/mingw-w64-cmake/src/cmake-3.22.0-rc2/Source/LexerParser -I/C/_/mingw-w64-cmake/src/cmake-3.22.0-rc2/Utilities/std -I/C/_/mingw-w64-cmake/src/cmake-3.22.0-rc2/Utilities -c /C/_/mingw-w64-cmake/src/cmake-3.22.0-rc2/Source/cmTimestamp.cxx -o cmTimestamp.o C:/_/mingw-w64-cmake/src/cmake-3.22.0-rc2/Source/cmTimestamp.cxx: In lambda function: C:/_/mingw-w64-cmake/src/cmake-3.22.0-rc2/Source/cmTimestamp.cxx:208:12: internal compiler error: Segmentation fault 208 | return strftime; | ^~~~~~~~ C:/_/mingw-w64-cmake/src/cmake-3.22.0-rc2/Source/cmTimestamp.cxx:208:12: internal compiler error: Aborted g++.exe: internal compiler error: Aborted signal terminated program cc1plus Please submit a full bug report, with preprocessed source if appropriate. See <https://github.com/msys2/MINGW-packages/issues> for instructions. ``` Error message from clang-13 ``` clang++ -march=pentium4 -mtune=generic -O2 -pipe -ID:/M/msys64/clang32/include -DCMAKE_BOOTSTRAP -DCMake_HAVE_CXX_MAKE_UNIQUE=1 -I/C/_/mingw-w64-cmake/src/build-CLANG32/Bootstrap.cmk -I/C/_/mingw-w64-cmake/src/cmake-3.22.0-rc2/Source -I/C/_/mingw-w64-cmake/src/cmake-3.22.0-rc2/Source/LexerParser -I/C/_/mingw-w64-cmake/src/cmake-3.22.0-rc2/Utilities/std -I/C/_/mingw-w64-cmake/src/cmake-3.22.0-rc2/Utilities -c /C/_/mingw-w64-cmake/src/cmake-3.22.0-rc2/Source/cmTimestamp.cxx -o cmTimestamp.o C:/_/mingw-w64-cmake/src/cmake-3.22.0-rc2/Source/cmTimestamp.cxx:208:5: error: return type 'unsigned int (*)(char *, unsigned int, const char *, const tm *)' must match previous return type 'unsigned int (*)(char *, unsigned int, const char *, const tm *) __attribute__((stdcall))' when lambda expression has unspecified explicit return type return strftime; ^ 1 error generated. make: *** [Makefile:396: cmTimestamp.o] Error 1 ```