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 has been released

  • 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.

Headers, Libraries and Runtime

  • More than a million lines of headers are provided, not counting generated ones, and regularly expanded to track new Windows APIs.
  • Everything needed for linking and running your code on Windows.
  • Winpthreads, a pthreads library for C++11 threading support and simple integration with existing project.
  • Winstorecompat, a work-in-progress convenience library that eases conformance with the Windows Store.
  • Better-conforming and faster math support compared to Visual Studio's.


  • gendef: generate Visual Studio .def files from .dll files.
  • genidl: generate .idl files from .dll files.
  • widl: compile .idl files.

Previous Versions


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


  • Expanded Windows Vista/7 API support.

Most Recent Activity

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

Kai Tietz posted a comment on discussion Open Discussion

Hi, well, any fortran application needs libgfortran runtime. Therefore I assume that fortran library is linked statically here. No idea why that happend, but it seems to me the most obvious cause. Regards, Kai Am Di., 25. Sep. 2018 um 06:41 Uhr schrieb HEMMI, Shigeru hemmi-shigeru@users.sourceforge.net: An executable program, MySomeExe.exe is built from some forran(+C) source files with the x86_64-8.1.0 mingw-w64 tool. I examined shared library dependencies by dumpbin command of MS. The output is...

crillion posted a comment on ticket #139

Ok. I usually install mingw-w64 via the installer mingw-w64-install.exe available at https://sourceforge.net/projects/mingw-w64/files/ . On this same link I usually check if a new compiler version has become available (but it's not clear if the same compiler has been re-released) So, who should I ask to, or on what other url should I check ? Is there a list of these toolchain providers ? Thanks, Marco

Jonathan Yong posted a comment on ticket #139

We don't dictate toolchain release schedules, you can always ask the providers themselves.

Rafał Harabień created merge request #12

winerror.h: Add error codes in range 740-807

Kai Henningsen created ticket #763

mktime hangs?