[yocto] [meta-qt5][meta-raspberrypi]: Qt5 with EGL support for the Raspberry through linux-oe-g++

[Julien Gueytat]

Hi again guys,

after more investigations:

I found out that the default value -lEGL comes from 
./mkspecs/common/linux.conf which is included in 
./mkspecs/linux-oe-g++/qmake.conf

linux-oe-g++ being the only generic mkspecs that should be used in Yocto

So! At the time the configuration enters egl.pro the content of the 
variables LIBS and QMAKE_EGL_LIBS are still a bit weird for me :

1- LIBS already has the content of the QMAKE_EGL_LIBS content from the 
result of the pkg-config command.
2- QMAKE_EGL_LIBS has the content of the default value found in 
./mkspecs/common/linux.conf

There are two options to have it properly working:
- First and easy option : remove the QMAKE_EGL_LIBS default variable in 
./mkspecs/linux-oe-g++/qmake.conf since the good libs seems to already 
been present in the LIBS variable.
- Second option : understand why the LIBS variable is already properly 
set and why the QMAKE_EGL_LIBS properly computed in the configure and 
present .qmake.vars is not used. (I would say that the device spec 
overrides the one from qmake spec... I did not dig further yet.)

Anyway I'm pretty sure the trouble comes from meta-qt5 side now. I'm 
pretty sure meta-raspberrypi maintainers can confirm that their master 
branch handles pkg-config stuff now.

Thanks advance for having a look on this guys,
Best Regards


Le 19/04/2016 10:46, Julien Gueytat a écrit :
> Hi,
>
> I still can't figure out the patch to apply in meta-qt5 to get EGL 
> support with the Raspberry.
>
> The test to check EGL does not pass and fails with the following command:
>
> arm-poky-linux-gnueabi-g++  -march=armv7-a -marm -mthumb-interwork 
> -mfloat-abi=hard -mfpu=neon-vfpv4 -mtune=cortex-a7 
> --sysroot=/home/jgueytat/projects/LightPixels/poky/build/tmp/sysroots/lightpixels 
> -Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed -Wl,-O1 -o egl egl.o   
> -lGLESv2 -lbcm_host -lvchostif -lvcos -lvchiq_arm -pthread -lEGL
>
>
> Here is the content of the file egl.pro:
>
> $ cat egl.pro
> SOURCES = egl.cpp
>
> for(p, QMAKE_LIBDIR_EGL) {
>     exists($$p):LIBS += -L$$p
> }
>
> message("In egl.pro - 1: QMAKE_LIBS_EGL = $$QMAKE_LIBS_EGL")
> message("In egl.pro - 1: LIBS = $$LIBS")
>
> !isEmpty(QMAKE_INCDIR_EGL): INCLUDEPATH += $$QMAKE_INCDIR_EGL
> !isEmpty(QMAKE_LIBS_EGL): LIBS += $$QMAKE_LIBS_EGL
>
> message("In egl.pro - 2: QMAKE_LIBS_EGL = $$QMAKE_LIBS_EGL")
> message("In egl.pro - 2: LIBS = $$LIBS")
>
> CONFIG -= qt
>
> In the main ./configure file of qtbase:
>
> | In configure #1: QMAKE_LIBS_EGL =
> | In configure #2: QMAKE_LIBS_EGL = -lEGL -lGLESv2 -lbcm_host 
> -lvchostif -lbcm_host -lvcos -lvchiq_arm -pthread
>
> The variable QMAKE_LIBS_EGL is set properly.
>
>
> In the ./config.tests/qpa/egl/egl.pro file:
>
> | Project MESSAGE: In egl.pro - 1: QMAKE_LIBS_EGL = -lEGL
> | Project MESSAGE: In egl.pro - 1: LIBS = -lEGL -lGLESv2 -lbcm_host 
> -lvchostif -lvcos -lvchiq_arm -pthread
> | Project MESSAGE: In egl.pro - 2: QMAKE_LIBS_EGL = -lEGL
> | Project MESSAGE: In egl.pro - 2: LIBS = -lEGL -lGLESv2 -lbcm_host 
> -lvchostif -lvcos -lvchiq_arm -pthread -lEGL
>
>
> *What I see is that:*
> In the configure file the variable QMAKE_LIBS_EGL is properly set 
> through pkg-config.
> In the egl.pro file... The variable LIBS gets the content of 
> QMAKE_LIBS_EGL and the variable QMAKE_LIBS_EGL gets back to its 
> default -lEGL.
>
> In the end with have -lGLESv2 before -lEGL and this does not link.
>
> I checked also the content of .qmake.vars:
> grep QMAKE_LIBS_EGL .qmake.vars
> QMAKE_LIBS_EGL = -lEGL -lGLESv2 -lbcm_host -lvchostif -lbcm_host 
> -lvcos -lvchiq_arm -pthread
>
>
> The command QMakeVar set QMAKE_LIBS_EGL "$QMAKE_LIBS_EGL" seems to 
> have his job done too late...
>
> If someone has an idea to get the proper correction done...
>
> Best Regards,
> Julien
>
>
>

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