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MCF Gthread is a threading support library for Windows 7 and above that implements the gthread interface set, which is used internally both by GCC to provide synchronization of initialization of local static objects, and by libstdc++ to provide C++11 threading facilities.

I decide to recreate everything from scratch. Apologies for the trouble.

How to build

You need to run these commands in a native MSYS2 shell (MINGW32 or MINGW64 is recommended):

autoreconf -i  # requires autoconf, automake and libtool
./configure
make -j$(nproc)
make -j$(nproc) check

Cross-compiling from Linux is also supported:

autoreconf -i  # requires autoconf, automake and libtool
# Install cross-compilers first.
# On Debian this can be done with `sudo aptitude install gcc-mingw-w64-{i686,x86-64}`.
./configure --host=i686-w64-mingw32  # or `x86_64-w64-mingw32` for 64-bit builds
make -j$(nproc)

Notes

In order for __cxa_atexit() (and the non-standard __cxa_at_quick_exit()) to conform to the Itanium C++ ABI, it is required 1) for a process to call __cxa_finalize(NULL) when exiting, and 2) for a DLL to call __cxa_finalize(&__dso_handle) when it is unloaded dynamically. This requires hacking the CRT. If you don't have the modified CRT, you may still get standard compliance by 1) calling __MCF_exit() instead of exit() from your program, and 2) calling __cxa_finalize(&__dso_handle) followed by fflush(NULL) upon receipt of DLL_PROCESS_DETACH in your DllMain().

This project is developed and tested on x86 and x64 and hasn't been tested on other CPU architectures.

This project uses some undocumented NT system calls and might be broken in future Windows versions. The author gives no warranty for this project. Use it at your own risk.