Using QMAKE to build a both 32 and 64 bits versions of project

Question

I need to generate a 32 bits version of my application however I am compiling on a 64 bits OS. I'm looking for a way to make QMake to generate both 32 and 64 bits versions of my application. If this is not possible I would like to know how to switch to 32 bits. I would also like to avoid having to mess with the generated makefile.

PiedPiper · Accepted Answer · 2010-12-16T00:40:31.917

8

Use a construction something like:

CONFIG += 32bit

CONFIG(32bit) {
    TARGET = 32bit_binary
    QMAKE_CXXFLAGS += -m32
    LIBS += -L<path to 32bit libraries>
}
CONFIG(64bit) {
    TARGET = 64bit_binary
}

in your .pro file. Then you only need to change one line to recompile for the other architecture.

edited Dec 16 '10 at 00:40

answered Dec 08 '10 at 12:12

PiedPiper

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You didn't mention which compiler you are using: you will need to change the flags in my example to the right ones for your compiler. – PiedPiper Dec 10 '10 at 00:31
I'm using GCC so I believe '-m32' is correct but for some reason the qmake generates the makefile with '-m64' anyway – Raphael Dec 13 '10 at 06:08
Sorry the variale should be QMAKE_CXXFLAGS and not QMAKE_CFLAGS_RELEASE. I've edited my answer – PiedPiper Dec 13 '10 at 23:33
Thank you very much for this. This is going straight to my cheat list. – Raphael Dec 16 '10 at 11:09

score 2 · Answer 2 · answered Jun 12 '14 at 19:31

Make use of win32: in front of each command you would like be run for win32 architecture only. Or can use a scope as

win32 {
     SOURCES += paintwidget_win.cpp
 }

Also, you may refer to the architecture win32 or x64 with the ($Platform) MSDN macro for Visual Studio.

Using QMAKE to build a both 32 and 64 bits versions of project

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