Compile+Build with external gcc

zvivered · wrote on 22 Oct 2012, 19:41

Hello,

I want to build a QT console application with external gcc toolchain (created with the crosstool-ng project)
and not with the default gcc installed on my Centos 5.8

Is it possible ?

I need external gcc because my application will run under kernel 2.6.27.35
The toolchain was build using this kernel headers.

Centos 5.8 runs with a patched 2.6.18 kernel.

Thanks,
Zvika

sierdzio · wrote on 23 Oct 2012, 06:01

It is. If you are using Qt Creator, use Tools and Kits to set up your toolchain. If you are using just qmake, you need to adjust one of the mkspecs (or create your own) from <install dir>/mkspecs so that it uses the compiler you want, and then run your project with:
@
qmake -spec name-of-your-makespec
make
@

tobias.hunger · wrote on 23 Oct 2012, 08:53

You will need to edit the mkspec when using qmake (provided your GCC is not called gcc/g++), even if you point creator to the right tool chain: Unfortunately we can not set the compiler name that qmake will use:-/ That needs to be changed in the mkspec.

The path to the compiler will be set by creator.

zvivered · wrote on 23 Oct 2012, 20:40

Dear Members,

After downloading and extracting qt-everywhere-opensource-src-4.8.3.tar.gz should I compile it using the external gcc ?

What is the role of " -embedded " in the .configure phase ?

Thanks,
Zvika

tobias.hunger · wrote on 23 Oct 2012, 20:49

What is this "external gcc" you are talking about? I am not aware of any internal one, so I keep wondering:-)

zvivered · wrote on 24 Oct 2012, 03:34

Hello,

The "external gcc" is a gcc toolchain built with crosstool-ng project (1.5.2).
This toolchain was used to build the kernel (2.6.27.35), device driver and application.

I think all libraries I'm using (e.g QT) should also built with this toolchain.
Am I right ?

Thanks,
Zvika