GCC for Windows 64 & 32 bits


Mingw-w64 is an advancement of the original mingw.org project, created to support the GCC compiler on Windows systems. It has forked it in 2007 in order to provide support for 64 bits and new APIs. It has since then gained widespread use and distribution.

The development and community are very active and welcoming with new contributors every month and simple installers.

Version 9 has been released

v9.0.0: 2021-05-22

Notable changes:

  • UCRT updates by Biswapriyo Nath
  • Wine updates by Jacek Caban
  • Various new and updated API headers by Biswapriyo Nath and Liu Hao
  • Various UCRT and MSVCRT fixes by Martin Storsjö
  • at_quick_exit implementation by Martin Storsjö
  • dism API by Biswapriyo Nath
  • idl fixes by Steve Lhomme
  • Winpthreads fixes by Liu Hao
  • gettimeofday precision increase by Christian Franke
And many other additions thanks to, but not limited to (in Alphabetical order)

You can also look at the full list of versions.

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.

Friend projects

Mingw-w64 interacts a lot with other projects in order to help everyone move forward. Contributions have been going to and coming from these projects:

Most Recent Activity

Nicholas Harvey created ticket #174

most recent version of gcc

xoviat created ticket #173

updated version

Martin Storsjö committed [2938ef]

crt: Fix conversion of denormals from 64 bit doubles to 80 bit form

Martin Storsjö committed [6aa945]

Change formatting of double precision floating-points in hexadecimal to match glibc.

Martin Storsjö committed [a3978b]

crt: Fix exponent when formatting long double in hexadecimal.

Martin Storsjö committed [10e144]

crt: Expand mixed tabs/space indentation in mingw_pformat.c to plain spaces

stinos posted a comment on ticket #515

Fair point, should indeed likely just use copysign.

David James created ticket #916

asinh incorrect for large values

David James posted a comment on ticket #515

I don't think return ( x >= 0.0 ? z : -z); would be correct, since it would then give 0.0 for asinh(-0.0) (it should give -0.0, which it currently does). (I think atanh is coded per the suggestion, and gives the incorrect 0.0 for atanh(-0.0)). Isn't it possible to just use copysign?

Vincent Grande modified a comment on ticket #914

This turned out to be a bug on my end with my configuration fortunately. Sorry for the confusion. I dont see were to close this issue so i cant do it.