Hi everybody, The mingw32-qt.spec file which is currently used in Fedora uses a rather unconventional method to build the package. This involves a script which has to run on the packagers' host, runs Qt's configure.exe using wine and generating a diff against a clean source directory. In the .spec file itself only some folders are built.
As you can see this is a kinda hacked up method to get Qt compiled. Yesterday, Kalev Lember mentioned in #fedora-mingw that as of Qt 4.7.0 support for cross-compiling should have been improved. So I decided to try to rewrite the Qt .spec file. In the end I managed to get Qt compiled without the hacks which were originally used. As a bonus support for MMX and SSE optimizations has also been added. There still are some patches which need to be applied, but most of it is upstreamable. During this rewrite I stumbled across some issues which I would like to share with the list so we come to a solution which everybody agrees on. In the original .spec file a mkspecs target was created called 'win32-fedora-cross'. People had to use the command 'qmake-qt4 -spec win32-fedora-cross' to compile Qt applications using MinGW. During the rewrite I noticed that Qt's build system interprets that name as a MSVC toolchain based one. This resulted in errors where the linker was trying to link to .lib files instead of .a files for example. GCC based toolchains have to use the prefix 'win32-g++'. For now I've patched around this limitation, but I think we should discuss changing it to a new name as we should limit the number of patches required to an absolute minimum. Kalev mentioned another MinGW cross compiler project  which uses the mkspecs name win32-g++-cross. I would like to propose that we switch to that name as well for Fedora 14 and rawhide. There's also a mingw-w64 testing repository out there  which bundles Qt. For mingw-w64 I'd like to propose the mkspecs name win32-g++-cross-x64. Discussion whether these are good or bad names is welcome. Next there's the issue about bundled libraries which is a hot topic on the fedora-devel list these days. By default Qt bundles several libraries in it's DLL's. Among these are zlib, libjpeg, libtiff, libpng and openssl. We already have those libraries in the Fedora repositories. Upstream's releases don't have any dependencies on these external libraries as they're all bundled inside the Qt DLL's. So the question is whether we should confirm to the way upstream wants it or the way Fedora wants it. Comments are welcome. As soon as we've agreed on these two questions I'll build the new Qt package and push it to F14 and rawhide. Kind regards, Erik van Pienbroek 1. http://hg.savannah.gnu.org/hgweb/mingw-cross-env 2. http://email@example.com/msg00135.html _______________________________________________ mingw mailing list firstname.lastname@example.org https://admin.fedoraproject.org/mailman/listinfo/mingw