GCC for Windows 64 & 32 bits

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Mingw-w64 brings free software toolchains to Windows. It hosts a vibrant community which builds and debugs software for Windows while providing development environment for everyone to use.

It has forked mingw.org in order to move forward and provide 64bit support and support for new APIs and has brought countless improvements since its creation in 2007.

Version 4.0 is out. See the change summary and check the downloads.

Website is evolving. The website is changing; please forgive us for a small lack of polishing for a few days and please report issues you encounter.


More than a million lines of headers are already there and the count is continuously increasing to stay up-to-date with new versions of Windows.


Mingw-w64 is not a compiler project but a project used with compilers. Of course, for simplicity, many pre-packaged toolchains are available in the Downloads section and several of them come with additional libraries and tools for extra convenience.

Libraries and Runtime

All the additional libraries needed to link your code and run it directly on Windows are provided along with libraries like winpthreads which provides support for C++11 threading and winstorecompat, a work-in-progress convenience library to ease conformance with the Windows Store.


In addition to the usual compilers, linkers and debuggers from the toolchain, mingw-w64 provides gendef to generate Visual Studio .def files from a .dll, genidl to generate .idl files from a .dll and widl to compile them.

Version 4.0

  • 32bit ARM thumb software math (Thanks to André Hentschel!).
  • New ftw() support for gcc-5.x support.
  • Experimental printf changes - Ability to print 128bit integers (%I128*) and Decimal Floats (%H, %D), disabled by default. Build the CRT with –enable-experimental to use.
  • Updated OpenGL 4.5 headers.
  • Better DirectX 11 support.
  • Better Windows 7, 8/8.1 API support.

Version 3.0

  • Required for GCC 4.8
  • Much improved floating point math performance
  • Improved MSVC intrinsics performance
  • Addition of wide variants in C99 printf and
  • Partial C1X secure CRT
  • Partial MS Secure CRT templates for
  • Vastly improved Windows 7 and 8 win32 API
  • POSIX-style Large File
  • Winpthread: new library, pthreads implementation for
  • Winstorecompat: new library for Windows Store compatibility (WIP)

Version 2.0

Version 2.0 focused on expanding Windows Vista/7 API support.

The Sourceforge.net project page has the full list of releases and more details.

Latest Activity

John Mullins posted a comment on ticket #734

It's better to investigate this in the new legacy branch: https://github.com/drfrag666/gzdoom/tree/legacy No hacks there. There are two problems causing the crashes, one with generic object destruction and another one with destruction of thread_local objects. These are using thread_local now:: thread_local VMFrameStack GlobalVMStack; thread_local FDynLightData lightdata; static thread_local TArray<ADynamicLight*> addedLightsArray;

Florent CABRET created ticket #138

Windows Registered I/O (RIO)

Daniel Starke created ticket #751

Missing and wrong types in ws2tcpip.h

Jacek Caban committed [49ca7c]

stddef.h: Avoid max_align_t declaration conflict with clang stddef.h.

Martin Storsjö committed [710b8e]

winstorecompat: Don't build RtlAddFunctionTable on IA-32

Martin Storsjö posted a comment on ticket #747

This seems to have been a known issue in 2.30, which should be fixed in 2.31 which should be out pretty soon, see the binutils mailing list link in the previous post.

Martin Storsjö committed [d0607a]

winstorecompat: Fix EnumProcessModule

Martin Storsjö committed [0e1f41]

winstorecompat: Add an implementation of EnumProcessModules

Martin Storsjö committed [868fe2]

crt: Split wassert.c into a separate assert.c

Martin Storsjö committed [17e239]

crt: Regenerate Makefile.in