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Qt Developers Reconsider MinGW For Qt 5.0

Free Software

Published on 01 September 2012 03:34 PM EDT
Written by Michael Larabel in Free Software
14 Comments

While we're now up to the Qt 5.0 beta stage, Qt developers are still settling for what MinGW implementation to use for the Windows build of Qt 5.0.

MinGW, the Minimalist GNU for Windows, is the native port of GCC and Binutils that Qt uses for building their Windows version of the Qt tool-kit. Kai Koehne, an official Qt developer, re-sparked the Qt MinGW conversation this week about what package to officially support for the Qt 5.0 release. At the moment they're using MinGW 4.5 32-bit, but the latest MinGW release is now a port of GCC 4.7 except the problem with the official MinGW is that it's still 32-bit-only.

As possible alternatives, Kai tried out the 32/64-bit versions of TDM-GCC, Mingw-64, and Mingw-builds. TDM-GCC presented a nice installer but a somewhat stale GCC 4.6.1 + GDB 7.3.1 and not much activity all around, Mingw-64 is officially at GCC 4.5.4 but there's modern semi-official builds, and for mingw-builds they're closely following upstream GCC.

For why MinGW matters for Qt on Windows, "One might think that the only difference in these packages is the gcc version, but this isn't the truth. They also deviate e.g. in the COM headers, which can easily lead to build breakages ... That's why I think it's important to promote _one_ mingw 64 bit package as the officially supported one, and ideally even get it CI tested."

The mingw-builds project was able to build Qt 5.0 Beta out-of-the-box with only one minor patch being needed. What's being debated now is whether to add mingw-builds (based on GCC 4.7.1) to the list of tier-one configurations as a 64-bit version, support mingw-builds for 32-bit and 64-bit, or just leave it as-is without a more recent MinGW compiler and to be 32-bit-only.

This discussion is taking place on the project's development list. So far most feedback seems to be favoring Mingw-w64. Besides the MinGW-w64 fork supporting both 32-bit and 64-bit modes, it also includes updated files for supporting more recent parts of the Windows API.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
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