MinGW-W64 8.1.0 can't compile SFML from git

[abcnb]

The first way is ok:

• https://www.sfml-dev.org/files/SFML-2.5.1-sources.zip 
• cmake gui 3.22.1 
• MinGW-W64 8.1.0 ok

The second way is not:

• git clone https://github.com/SFML/SFML/
  
• cmake gui 3.22.1
• MinGW-W64 8.1.0 complains about many problems

$ mingw32-make
Consolidate compiler generated dependencies of target sfml-system
[  1%] Building CXX object src/SFML/System/CMakeFiles/sfml-system.dir/FileInputStream.cpp.obj
In file included from C:/PROGRA~1/MINGW-~1/X86_64~1.0-W/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/filesystem:37,
                 from C:/Users/G/gitreps/SFML/include/SFML/System/FileInputStream.hpp:37,
                 from C:\Users\G\gitreps\SFML\src\SFML\System\FileInputStream.cpp:28:
C:/PROGRA~1/MINGW-~1/X86_64~1.0-W/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/bits/fs_path.h: In member function 'std::filesystem::__cxx11::path& std::filesystem::__cxx11::path::operator/=(const std::filesystem::__cxx11::path&)':
C:/PROGRA~1/MINGW-~1/X86_64~1.0-W/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/bits/fs_path.h:237:47: error: no match for 'operator!=' (operand types are 'std::filesystem::__cxx11::path' and 'std::filesystem::__cxx11::path')
    || (__p.has_root_name() && __p.root_name() != root_name()))
                               ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~
and others
 

Why is that?

[eXpl0it3r]

The master branch on the repository is newly targeting C++17. Unfortunately the MinGW 8.1 version doesn't seem to contain a full/proper <filesystem> implementation (see this SO answer).

If you want to stick to GCC on Windows, I recommend using WinLibs (pick the MSVCRT and not the UCRT version) or MSYS2.

[abcnb]

Thank you very much! I'm just studying all of it (c++, git, cmake) and your answer saved a ton of time!