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

Martin Storsjö committed [b1de31]

ucrt: Move _snwprintf and fwprintf to separate translation units

Martin Storsjö committed [9077bf]

crt: Regenerate Makefile.in

Martin Storsjö committed [c69c7a]

headers: Update the threadlocinfo struct for ucrt

Martin Storsjö committed [7e9a76]

ucrt: Remove a leftover comment

LH_Mouse committed [04db04]

include/winbase.h: Add new PROC_THREAD_ATTRIBUTE values

G4JC created ticket #95

Add 'SearchAPI.h'

Martin Storsjö committed [f1a55b]

widl: Allow overriding the default include path

Martin Storsjö committed [5a6103]

widl: Regenerate Makefile.in and configure

LH_Mouse committed [4539f4]

include/winioctl.h: Add new device types.

HEMMI, Shigeru posted a comment on discussion Open Discussion

Dear Kai, Thanks for the reply and I agree with what you wrote. Best regards, HEMMI, Shigeru