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Mingw-w64 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 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)

Version 2.0 focused on expanding Windows Vista/7 API support.
The project page has the full list of releases and more details.

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