[Bug libstdc++/100376] __gnu_cxx::stdio_filebuf does not work correctly on windows for GCC 12
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100376 Jonathan Wakely changed: What|Removed |Added Status|UNCONFIRMED |RESOLVED Resolution|--- |INVALID --- Comment #4 from Jonathan Wakely --- User error
[Bug libstdc++/100376] __gnu_cxx::stdio_filebuf does not work correctly on windows for GCC 12
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100376 --- Comment #3 from cqwrteur --- i understand what's going on here. It is because std::filebuf in libstdc++ has a __c_lock data member which is before the __c_file. However, libstdc++ on windows does not support threading. A lot of people including me was using GCC with MCF gthread. The __gthread_lock_t in mcf gthread leads a different abi compared to nomarl version of libstdc++. The solution is that we need to provide win32 threading with libstdc++ by ourselves with win32 apis. Or if people are using different threading libraries, we get an ABI breaking.
[Bug libstdc++/100376] __gnu_cxx::stdio_filebuf does not work correctly on windows for GCC 12
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100376 --- Comment #2 from cqwrteur --- (In reply to cqwrteur from comment #1) > What thing very wierd is that the code runs correctly under wine but > incorrect on windows, even it is the same program. > > D:\hg\fast_io\.tmp\vdso>g++ -o test test.cc -Ofast -std=c++20 -s -flto > -march=native -I../../include > > D:\hg\fast_io\.tmp\vdso>test > 3 > 0 > > D:\hg\fast_io\.tmp\vdso>g++ -o test test.cc -Ofast -std=c++20 -s -flto > -march=native -I../../include -static > > D:\hg\fast_io\.tmp\vdso> > D:\hg\fast_io\.tmp\vdso>test > 3 > 3 > > It looks this is an issue with libstdc++.dll's abi?? maybe I missed > something here? Oh. i understand what is happening here. I installed too many versions of libstdc++.dll, they conflict with each other. Does windows have a version checker for dlls like Linux does?
[Bug libstdc++/100376] __gnu_cxx::stdio_filebuf does not work correctly on windows for GCC 12
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100376 --- Comment #1 from cqwrteur --- What thing very wierd is that the code runs correctly under wine but incorrect on windows, even it is the same program. D:\hg\fast_io\.tmp\vdso>g++ -o test test.cc -Ofast -std=c++20 -s -flto -march=native -I../../include D:\hg\fast_io\.tmp\vdso>test 3 0 D:\hg\fast_io\.tmp\vdso>g++ -o test test.cc -Ofast -std=c++20 -s -flto -march=native -I../../include -static D:\hg\fast_io\.tmp\vdso> D:\hg\fast_io\.tmp\vdso>test 3 3 It looks this is an issue with libstdc++.dll's abi?? maybe I missed something here?
