https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98300
--- Comment #5 from fdlbxtqi <euloanty at live dot com> --- (In reply to Nathan Sidwell from comment #3) > Hm, I thought there was sufficient #ifing to prevent that ... BTW. I tried the example you showed on the GCC module webpage on Linux. It fails to compile. why? cqwrteur@Home-Server:~/myhome/test_module$ vim hello.cc cqwrteur@Home-Server:~/myhome/test_module$ vim a.cc cqwrteur@Home-Server:~/myhome/test_module$ g++ -fmodules-ts hello.cc main.cc -Ofast -std=c++20 -s /usr/bin/ld: /tmp/ccQUwe74.o: in function `_GLOBAL__sub_I_main': main.cc:(.text.startup+0x31): undefined reference to `_ZGIW5helloEv' collect2: error: ld returned 1 exit status My MinGW-w64 msys2 build script Just run makepkg-mingw in the msys2 console and the compiler will get built. https://bitbucket.org/ejsvifq_mabmip/mingw-gcc-mcf-gthread/src/master/
