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MinGW is a free and open source Windows port of the GCC compiler and related tools. Qt supports MinGW as a platform on Windows in addition to Visual Studio compiler by Microsoft. However, it can also be used as a cross-compiler e.g. on Unix (currently not officially supported).
Qt Creator supports compiling with a MinGW toolchain out of the box.
MinGW distributions and versions
There are actually different MinGW toolchains and packages available:
MinGW.org is the original project. The latest version gcc 4.7.2. It only compiles for 32 bit binaries.
MinGW-w64 [mingw-w64.sourceforge.net] is a fork with the original aim to also support generation of 64 bit binaries. By now it also supports a much larger part of the Win32 API. The MinGW-w64 project does host several different binary packages, done by different people.
There are binary installers targetting MinGW for both Qt 4 and Qt 5. Up to Qt 4.8.6, Qt 4 ones are built with a MinGW.org toolchain using gcc 4.4. Newer Qt 4.8 binary packages ship with a mingw-w64 based toolchain. For Qt 5, a newer MinGW-w64 toolchain is actually required.
Toolchains used in Qt binary packages
Link error 'Undefined reference to _Unwind_Resume'
This error occurs if object files / libraries being linked are compiled with different versions of mingw. The following steps can fix a problem:
mingw32-make distcleanin order to remove all object files that was compiled with different mings versions.
- Explicitly set library path by setting
LIBRARY_PATHenvironment variable, for example
set LIBRARY_PATH=c:\mingw\lib. gcc linker have a very complicated library search algorithm that can result in wrong library being linked (for example, mingw can find installation of strawberry perl in PATH and use it's library).