[Cross compilation] Build a 32 app on a 64 bits computer using either CMake or QMake

mistralegna

Hi,

I'd like to know if it is possible to compile my application for a 32 bits computer (on Linux) on a 64 bits (also on Linux).

I would prefer to use CMake, in order to follow my enterprise development rules, but if not possible, I'll move on QMake.

Thanks to all of you.

koahnig

Hi,
this will depend on your compiler you are using. If it is a pure 32bit compiler, there is probably nothing to do. If you have a 64 bit compiler you will have to find the proper compiler option to cross compile.

You have to setup Qt as for cross compilation to any arbitrary 32 bit platform.

mistralegna

Thanks a lot. I'll try tomorrow.
But I guess your solution is only available using QMake.
Have you ever heard about the use of CMake ?

For the moment, I manage to set the CXXFLAGS to m32 (to force the 32 bits compilation), but I didn't found how to link with the lib32 Qt libraries. Excuse the fact my post perhaps would be better on the forum of CMake website ;)

Thanks !

goetz

It's a matter of the compiler tool chain(s) involved. If you use qmake, cmake or some hand crafted Makefiles should not matter.

mistralegna

Hi once again !

I have an ultimate question. As I said it above, I managed to set the Cxx flag when compiling object files. But I don't know how to pass the correct flags when creating the executable.

Thank you a lot !

goetz

That should be passed to the linker, using the linker flags. In regular Makefiles it's usually LDFLAGS