cmake mingw-w64: strange error when trying to build

Question

I have installed MinGW-w64 and built a simple Hello World Program. But the second time I run cmake --build. a strange error occurs. When the Path variable is set to C:/MinGW/bin everything is fine and works. But when I set the Path to C:/msys64/mingw64/bin this happens:

PS C:\repos\hellovs\build> cmake ../ -G Ninja
-- The CXX compiler identification is GNU 10.1.0
-- Check for working CXX compiler: C:/msys64/mingw64/bin/c++.exe
-- Check for working CXX compiler: C:/msys64/mingw64/bin/c++.exe - works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Configuring done
-- Generating done
-- Build files have been written to: C:/repos/hellovs/build
PS C:\repos\hellovs\build> cmake --build ./
[2/2] Linking CXX executable HelloVS.exe
PS C:\repos\hellovs\build> cmake --build ./
ninja: error: FindFirstFileExA(c/:/msys64/mingw64/include/c++/10.1.0): ╤шэЄръёшўхёър  ю°шсър т шьхэш Їрщыр, шьхэш яряъш шыш ьхЄъх Єюьр.

HelloVS.exe compiles normally the first time the build command is run.

Apparanteley Ninja tryies to use an invalid path. Any idea about how to fix this?

---

Seems like invalid dependencies have been generated:

PS C:\repos\hellovs\build> ninja -t recompact
PS C:\repos\hellovs\build> ninja -t deps
CMakeFiles/HelloVS.dir/main.cpp.obj: #deps 136, deps mtime 6109023486207704 (VALID)
    ../main.cpp
    C/:/msys64/mingw64/include/c++/10.1.0/iostream
    C/:/msys64/mingw64/include/c++/10.1.0/x86_64-w64-mingw32/bits/c++config.h
    C/:/msys64/mingw64/include/c++/10.1.0/x86_64-w64-mingw32/bits/os_defines.h
    C/:/msys64/mingw64/include/c++/10.1.0/x86_64-w64-mingw32/bits/cpu_defines.h
    C/:/msys64/mingw64/include/c++/10.1.0/pstl/pstl_config.h
    C/:/msys64/mingw64/include/c++/10.1.0/ostream
...

Answer 1

It's a GCC bug.

MSYS2 maintainers decided to not wait for the upstream and patched it .

Run pacman -Syuu from MSYS2 shell to update your packages.