melonDS compilation fails when linking CXX executable

[extherian]

I got the following error message:

[100%] Linking CXX executable ../../../melonDS.exe
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/11.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/11.2.0/../../../../lib\libb2.a(libb2_la-blake2sp.o):(.text+0x14): undefined reference to omp_get_thread_num' C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/11.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/11.2.0/../../../../lib\libb2.a(libb2_la-blake2sp.o):(.text+0x96): undefined reference to omp_get_thread_num'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/11.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/11.2.0/../../../../lib\libb2.a(libb2_la-blake2sp.o):(.text+0x55c): undefined reference to omp_set_num_threads' C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/11.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/11.2.0/../../../../lib\libb2.a(libb2_la-blake2sp.o):(.text+0x582): undefined reference to GOMP_parallel'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/11.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/11.2.0/../../../../lib\libb2.a(libb2_la-blake2sp.o):(.text+0x9a2): undefined reference to omp_set_num_threads' C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/11.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/11.2.0/../../../../lib\libb2.a(libb2_la-blake2sp.o):(.text+0x9d7): undefined reference to GOMP_parallel'
collect2.exe: error: ld returned 1 exit status
make[2]: *** [src/frontend/qt_sdl/CMakeFiles/melonDS.dir/build.make:814: melonDS.exe] Error 1
make[1]: *** [CMakeFiles/Makefile2:248: src/frontend/qt_sdl/CMakeFiles/melonDS.dir/all] Error 2
make: *** [Makefile:91: all] Error 2

No idea what this means, unfortunately. I followed all the instructions in README.md, so I don't know why I'm getting undefined reference errors.

[RayyanAnsari]

known issue with msys2, they recently added a package for libb2 which we depend on via libarchive.
m-ab-s/media-autobuild_suite#2123

[RayyanAnsari]

This should now be fixed by msys2/MINGW-packages#10707 (comment)

[extherian]

OK, I'll just have to wait until the main MSYS2 website updates its download with these new changes.

[Biswa96]

The fixed package is uploaded https://packages.msys2.org/updates. It may take time to reach all the mirrors. Meanwhile keep spamming pacman -Syyuu command to update packages.

[extherian]

@RayyanAnsari this fixed my problem and I compiled the program successfully, thanks for all your help!

[Biswa96]

Thank you too for reporting this issue quickly 🤗 It is easier to fix an issue with a minimal reproducible sample.