Hi, Qt as of version 6.9 stopped working with winpthreads so I've switched to building gcc with win32 threads (configure --enable-threads=win32). But I'm getting a crash on program exit which was not there with winpthreads, but I can't get debug symbols to show for libstdc++. I've built gcc with --enable-libstdcxx-debug, and used libstdc++-6.dll from the debug directory. I've added -D_GLIBCXX_DEBUG to CXXFLAGS for both Qt and the program, still see no debug symbols for libstdc++. I'm cross-compiling using gcc 15.1.0 and mingw-w64 12.0.0. Thread 1 received signal SIGSEGV, Segmentation fault. 0x00007ffd8d3b6b67 in ?? () from C:\Program Files\Strawberry Music Player Debug\libstdc++-6.dll (gdb) bt #0 0x00007ffd8d3b6b67 in ?? () from C:\Program Files\Strawberry Music Player Debug\libstdc++-6.dll #1 0x00007ffdda8e42d6 in ucrtbase!_execute_onexit_table () from C:\WINDOWS\System32\ucrtbase.dll #2 0x00007ffdda8e41fb in ucrtbase!_execute_onexit_table () from C:\WINDOWS\System32\ucrtbase.dll #3 0x00007ffdda8e41b4 in ucrtbase!_execute_onexit_table () from C:\WINDOWS\System32\ucrtbase.dll #4 0x00007ffd8d39114c in ?? () from C:\Program Files\Strawberry Music Player Debug\libstdc++-6.dll #5 0x00007ffd8d391226 in ?? () from C:\Program Files\Strawberry Music Player Debug\libstdc++-6.dll #6 0x00007ffddcc69a1d in ntdll!RtlActivateActivationContextUnsafeFast () from C:\WINDOWS\SYSTEM32\ntdll.dll #7 0x00007ffddccaf1ca in ntdll!LdrShutdownProcess () from C:\WINDOWS\SYSTEM32\ntdll.dll #8 0x00007ffddccaef7d in ntdll!RtlExitUserProcess () from C:\WINDOWS\SYSTEM32\ntdll.dll #9 0x00007ffddad4e3eb in KERNEL32!FatalExit () from C:\WINDOWS\System32\kernel32.dll #10 0x00007ffdda8f05bc in ucrtbase!exit () from C:\WINDOWS\System32\ucrtbase.dll #11 0x00007ffdda8f045f in ucrtbase!exit () from C:\WINDOWS\System32\ucrtbase.dll #12 0x00007ff7aaf413df in __tmainCRTStartup () at ../gcc- 15.1.0.build_/mingw-w64-v12.0.0/mingw-w64-crt/crt/crtexe.c:269 #13 0x00007ff7aaf41416 in mainCRTStartup () at ../gcc- 15.1.0.build_/mingw-w64-v12.0.0/mingw-w64-crt/crt/crtexe.c:188 Jonas