[Buildroot] Building Qt5 Declarative on nitrogen6x with buildroot 2013.08

[Buildroot] Building Qt5 Declarative on nitrogen6x with buildroot 2013.08

[Espen Frimann Koren]

Hi.

I have been trying to get the mentioned configuration to compile. It is not
straight forward :-)

First of all I compiled the nitrogen6x_defconfig without any problems. But
I need Qt5 Declarative so I tried to figure out how to configure it. From
the default config I had to do this:

1. Add C++ and WCHAR support in the tool chain. This made Qt5 available.
2. Qt5 Declarative was not available though needing an Open GL capable
backend, according to the menuconfig tool.
3. The Open GL-backend I found was in Target packages/Hardware
handling/Freescale i.MX libraries/gpu-viv-bin-mx6q. It needs eglibc, so I
had to change to that from uclibc.

But this configuration does not compile. I connot figure out what I am
missing. The first problem is that when Qt5 are running a lot of tests to
figure out what the target supports, it fails when trying to link the
libGLESv2.so in output/build/qt5base-5.0.2/config.tests/unix/openglesv2.
The libraries it needs is in the toolchain (in
output/host/usr/arm-buildroot-linux-gnueabi/sysroot/usr/lib): libGAL.so and
libEGL.so exists, so I got the compilation a little bit further by adding
the following lines into
output/build/qt5base-5.0.2/mkspecs/devices/linux-buildroot-g++/qmake.conf:

QMAKE_LIBS_OPENGL_ES2 += -lGAL
QMAKE_LIBS_OPENGL_ES2 += -lEGL

The problem now is compiling EGL (still in Qt5 config.tests/qpa/egl):

EGL auto-detection... ()
gmake[1]: Entering directory
`/home/espenfk/imx6/buildroot-2013.08/output/build/qt5base-5.0.2/config.tests/qpa/egl'
/home/espenfk/imx6/buildroot-2013.08/output/host/usr/bin/arm-buildroot-linux-gnueabi-g++
-c -pipe -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
-pipe -Os
--sysroot=/home/espenfk/imx6/buildroot-2013.08/output/host/usr/arm-buildroot-linux-gnueabi/sysroot
-O2 -O3 -Wall -W -fPIE  -I../../../mkspecs/devices/linux-buildroot-g++ -I.
-I/home/espenfk/imx6/buildroot-2013.08/output/host/usr/arm-buildroot-linux-gnueabi/sysroot/usr/include
-o egl.o egl.cpp
In file included from
/home/espenfk/imx6/buildroot-2013.08/output/host/usr/arm-buildroot-linux-gnueabi/sysroot/usr/include/EGL/eglplatform.h:38:0,
                 from
/home/espenfk/imx6/buildroot-2013.08/output/host/usr/arm-buildroot-linux-gnueabi/sysroot/usr/include/EGL/egl.h:34,
                 from egl.cpp:42:
/home/espenfk/imx6/buildroot-2013.08/output/host/usr/arm-buildroot-linux-gnueabi/sysroot/usr/include/EGL/eglvivante.h:224:22:
fatal error: X11/Xlib.h: No such file or directory
compilation terminated.
gmake[1]: *** [egl.o] Error 1
gmake[1]: Leaving directory
`/home/espenfk/imx6/buildroot-2013.08/output/build/qt5base-5.0.2/config.tests/qpa/egl'
EGL disabled.
 The EGL functionality test failed; EGL is required by some QPA plugins to
manage contexts & surfaces.
 You might need to modify the include and library search paths by editing
 QMAKE_INCDIR_EGL, QMAKE_LIBDIR_EGL and QMAKE_LIBS_EGL in
/home/espenfk/imx6/buildroot-2013.08/output/build/qt5base-5.0.2/mkspecs/devices/linux-buildroot-g++.
make: ***
[/home/espenfk/imx6/buildroot-2013.08/output/build/qt5base-5.0.2/.stamp_configured]
Error 1

The reason that it fails in eglvivante.h is that a symbol should have been
defined: EGL_API_FB (or EGL_API_DFB, but I think I cannot use DirectFB). At
this point I think it is a bit too much to hack the stuff in. I haven't
studied the inner makings of buildroot so much that I can figure out how to
define that symbol. So therefore I think that someone who knows this better
than me may either fix it in the next buildroot version or direct me to a
solution.

Sp1
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[Buildroot] Building Qt5 Declarative on nitrogen6x with buildroot 2013.08

[Espen Frimann Koren]

Hi again.

Not much response here, so therefore I had to dig more myself :-)

The problem (for me) is the difference between the files (inside Qt):
output/build/qt5base-5.0.2/mkspecs/devices/linux-imx6-g++/qmake.conf
output/build/qt5base-5.0.2/mkspecs/devices/linux-buildroot-g++/qmake.conf

The first file is part of the Qt distribution, the second is defined in
buildroot:
package/qt5/qt5base/qt5base-mkspecs-files.patch

I see a challenge here in that the linux-buildroot-g++-"device" that
buildroot "generates" must have some platform dependent stuff in it. How
this is done in buildroot, I do not know, but two things must into the
qmake.conf file of linux-buildroot-g++:

- the EGL and GAL libraries (in the imx6-file it is: QMAKE_LIBS_OPENGL_ES2
+= -lEGL -lGAL)
- the symbol EGL_API_FB must be defined (in the imx6-file it is:
IMX6_CFLAGS             = -DEGL_API_FB=1)

I understand that it cannot be put into the patch-file, since the EGL and
GAL libraries are interesting for imx6 only.

I will try to explore this more, but maybe someone may do it faster?

Sp1


On 15 September 2013 21:51, Espen Frimann Koren <espenfk@gmail.com> wrote:

> Hi.
>
> I have been trying to get the mentioned configuration to compile. It is
> not straight forward :-)
>
> First of all I compiled the nitrogen6x_defconfig without any problems. But
> I need Qt5 Declarative so I tried to figure out how to configure it. From
> the default config I had to do this:
>
> 1. Add C++ and WCHAR support in the tool chain. This made Qt5 available.
> 2. Qt5 Declarative was not available though needing an Open GL capable
> backend, according to the menuconfig tool.
> 3. The Open GL-backend I found was in Target packages/Hardware
> handling/Freescale i.MX libraries/gpu-viv-bin-mx6q. It needs eglibc, so I
> had to change to that from uclibc.
>
> But this configuration does not compile. I connot figure out what I am
> missing. The first problem is that when Qt5 are running a lot of tests to
> figure out what the target supports, it fails when trying to link the
> libGLESv2.so in output/build/qt5base-5.0.2/config.tests/unix/openglesv2.
> The libraries it needs is in the toolchain (in
> output/host/usr/arm-buildroot-linux-gnueabi/sysroot/usr/lib): libGAL.so and
> libEGL.so exists, so I got the compilation a little bit further by adding
> the following lines into
> output/build/qt5base-5.0.2/mkspecs/devices/linux-buildroot-g++/qmake.conf:
>
> QMAKE_LIBS_OPENGL_ES2 += -lGAL
> QMAKE_LIBS_OPENGL_ES2 += -lEGL
>
> The problem now is compiling EGL (still in Qt5 config.tests/qpa/egl):
>
> EGL auto-detection... ()
> gmake[1]: Entering directory
> `/home/espenfk/imx6/buildroot-2013.08/output/build/qt5base-5.0.2/config.tests/qpa/egl'
> /home/espenfk/imx6/buildroot-2013.08/output/host/usr/bin/arm-buildroot-linux-gnueabi-g++
> -c -pipe -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
> -pipe -Os
> --sysroot=/home/espenfk/imx6/buildroot-2013.08/output/host/usr/arm-buildroot-linux-gnueabi/sysroot
> -O2 -O3 -Wall -W -fPIE  -I../../../mkspecs/devices/linux-buildroot-g++ -I.
> -I/home/espenfk/imx6/buildroot-2013.08/output/host/usr/arm-buildroot-linux-gnueabi/sysroot/usr/include
> -o egl.o egl.cpp
> In file included from
> /home/espenfk/imx6/buildroot-2013.08/output/host/usr/arm-buildroot-linux-gnueabi/sysroot/usr/include/EGL/eglplatform.h:38:0,
>                  from
> /home/espenfk/imx6/buildroot-2013.08/output/host/usr/arm-buildroot-linux-gnueabi/sysroot/usr/include/EGL/egl.h:34,
>                  from egl.cpp:42:
> /home/espenfk/imx6/buildroot-2013.08/output/host/usr/arm-buildroot-linux-gnueabi/sysroot/usr/include/EGL/eglvivante.h:224:22:
> fatal error: X11/Xlib.h: No such file or directory
> compilation terminated.
> gmake[1]: *** [egl.o] Error 1
> gmake[1]: Leaving directory
> `/home/espenfk/imx6/buildroot-2013.08/output/build/qt5base-5.0.2/config.tests/qpa/egl'
> EGL disabled.
>  The EGL functionality test failed; EGL is required by some QPA plugins to
> manage contexts & surfaces.
>  You might need to modify the include and library search paths by editing
>  QMAKE_INCDIR_EGL, QMAKE_LIBDIR_EGL and QMAKE_LIBS_EGL in
> /home/espenfk/imx6/buildroot-2013.08/output/build/qt5base-5.0.2/mkspecs/devices/linux-buildroot-g++.
> make: ***
> [/home/espenfk/imx6/buildroot-2013.08/output/build/qt5base-5.0.2/.stamp_configured]
> Error 1
>
> The reason that it fails in eglvivante.h is that a symbol should have been
> defined: EGL_API_FB (or EGL_API_DFB, but I think I cannot use DirectFB). At
> this point I think it is a bit too much to hack the stuff in. I haven't
> studied the inner makings of buildroot so much that I can figure out how to
> define that symbol. So therefore I think that someone who knows this better
> than me may either fix it in the next buildroot version or direct me to a
> solution.
>
> Sp1
>
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[Buildroot] Building Qt5 Declarative on nitrogen6x with buildroot 2013.08

[Fatih Aşıcı]

Hi,

> I see a challenge here in that the linux-buildroot-g++-"device" that
> buildroot "generates" must have some platform dependent stuff in it.
> How this is done in buildroot, I do not know, but two things must into
> the qmake.conf file of linux-buildroot-g++:
> 
> 
> - the EGL and GAL libraries (in the imx6-file it is:
> QMAKE_LIBS_OPENGL_ES2  += -lEGL -lGAL)
> 
> - the symbol EGL_API_FB must be defined (in the imx6-file it is:
> IMX6_CFLAGS             = -DEGL_API_FB=1) 
> 
> I understand that it cannot be put into the patch-file, since the EGL
> and GAL libraries are interesting for imx6 only.
> 
qt5 packages use pkg-config to get EGL flags. See
rpi-userland/rpi-userland-add-pkgconfig-files.patch.

A similar patch is probably needed for the package providing EGL
libraries to nitrogen6x.