[meta-freescale] Cross-Compiling Qt Application for i.MX6

[Otavio Salvador]

On Sun, Jun 30, 2013 at 11:32 PM, squirem <squirem at fbdfrozen.com> wrote:
> I've been trying to figure out how to cross-compile a Qt-X11 application for
> a good while now. I've
> been
> able to cross-compile Qt5Base using LTIB, but since switching to Yocto I've
> found that Qt5 support
> isn't
> quite ready yet.

Yes, it is still work in progress...

> As for Qt4, I'm not quite sure how to cross-compile an application since Qt4
> itself requires a
> patch to
> add support for the i.MX6.

Do you have the patch to send to me? I can check it.

> So far I've been able to build the sato-sdk image which populated the
> sysroot directory with the
> cross-
> compilers, libraries, and headers. In the /usr/bin directory, there is an
> application called qmake2
> that
> seems to behave like qmake, but it complains about missing QMAKESPEC not
> being specified. I got a
> little
> further by adding the Qt4 mkspecs directory with the i.MX6 qmake.conf file
> posted here:
> https://community.freescale.com/docs/DOC-94066
>
> From there I was able to generate a makefile and was able to compile some
> source files not using
> the Qt
> library. However I failed to compile any QObjects, with the following error
> message: impossible
> constraint in 'asm'.
>
> I've found the following post on the yocto mailing where a developer was
> essentially at the same
> point
> as me:
> https://lists.yoctoproject.org/pipermail/yocto/2012-April/008514.html
>
> In that thread it was suggested that the OP simply create a recipe for his
> application and have
> poky
> build his application for him.
>
> What I'm wondering is how others are generally cross-compiling Qt4/5
> applications. What steps are
> taken
> in setting up cross-compilation?

I do cross build of Qt quite often and I use a meta-toolchain-qt for
it. So it builds a X11 compatible toolchain for Qt development.

--
Otavio Salvador                             O.S. Systems
http://www.ossystems.com.br        http://projetos.ossystems.com.br
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