qmake to build both 32-bit and 64-bit

[jacek]

The "CONFIG -= qt" is to tell qmake not to go with the qt configuration's makespec.

There are a lot of settings in qmake.conf that qmake needs to know, so it will read it anyway.

"CONFIG += qt" in short means: "link with Qt", but if you take a look at $QTDIR/mkspecs/features/qt.prf, you'll see this isn't that easy to reproduce just by setting some variables in a .pro file.

qmake should not tie to the qt configuration. It is a tool on top of gmake, but if it ties to the qt configuration, then it become useless tool when you have to build both 32-bit and 64-bit

If that's a common problem, then maybe Trolltech support has some ready made solution for this?

If you don't want that additional Makefile and there are no other ideas, you can also consider using other build systems:

• CMake,
• Scons,
• Waf (ex-bksys).

With CMake it should be doable using just one CMakeLists.txt file --- it's just a matter of resetting some variables. I don't know much about the other two build systems, but they're are similar to CMake.