Setting up cross compiling environment & Qt/X11 ... - Bytemark Hosting

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6.2 Using Qt
There are tree different ways of using Qt for compilation. You can simply use the terminal to
compile your Qt code, you can use the QtCreator or you can use Eclipse. For the QtCreator there
are two guides, depending on which version of QtCreator you are using. It is recommended to use
version 2 of QtCreator because it is much easier to set up cross compiling.
6.2.1 Using Qt in the Terminal
To use Qt in the terminal you simply need to go into the folder where your sources are and run
$ qmake ­project
to create the .pro file. This is required only once for each project but it needs to be done again when
you add source files. After that you can create a make file by invoking
$ qmake
Qt will take care of cross compilation and you just have to run
$ make
to compile the project.
6.2.2 Installing QtCreator
Install the normal QtCreator for X86 on your desktop machine. You do not need to install the whole
Qt libraries, only what is required for the QtCreator itself. To install QtCreator on a Debian based
system (like Ubuntu) type this in a terminal:
$ sudo apt­get install qtcreator
If you also want to install Qt for a local compilation invoke this command:
$ sudo apt­get install libqt4­dev
6.2.3 Using Qt with QtCreator 1.x.x
Start your QtCreator and create a simple project.
Now go to Tools → Options → Debugger → Gdb and select the ARM cross gdb:
/opt/eldk­5.2.1/armv7a/sysroots/i686­eldk­linux/usr/bin/armv7a­vfp­neonlinux­gnueabi/arm­linux­gnueabi­gdb
On the left side go to Qt4 → Qt Versions and add a new Qt version to Manual. Call it something
like Qt 4.8.2 for ARM and add the qmake executable:
/usr/local/Trolltech/Qt­arm­X11/bin/qmake
Now the QtCreator is ready for cross compiling. There is one issue with the ELDK which causes g+
+ to complain about this:
note: the mangling of 'va_list' has changed in GCC 4.4
This is a known issue and can be ignored. To tell GCC to suppress this message you can pass the
argument -Wno-psabi to it. To do this in a Qt project add the following line at the end of your .pro
file:
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