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Date: Fri, 30 May 2014 23:16:14 +0200
Subject: [Buildroot] [PATCH 1/1] ti-gfx: pkg-config should also set
 parent include dir
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On 30.05.2014 22:57, Yann E. MORIN wrote:
> Peter, All,
>
> On 2014-05-30 22:41 +0200, Peter K?mmel spake thusly:
>> In short: anybody assumes "#include <GLES2/gl2.h>" works when the search
>> paths of pkg-config are used. But when pkg-config reports /usr/include/GLES2
>> gl2.h could not be found, because there is no /usr/include/GLES2/GLES2/gl2.h.
>>
>> Until now this doesn't pop up because by chance the directory GLES2
>> resides in /usr/include and this path is added by most by build systems.
>> But the cmake configure scripts of Qt5 test for "GLES2/gl2.h" only in the path
>> reported by pkg-config.
>
> And what if we do not specify any Cflags in the .pc? Is Qt5's configure
> script happy with that?
>
> Regards,
> Yann E. MORIN.
>

The cmake code generated by Qt5 is very restrictive
(sysroot/usr/lib/cmake/Qt5Gui/Qt5GuiConfigExtras.cmake):

set(_GL_INCDIRS "/usr/include/GLES2")
find_path(_qt5gui_OPENGL_INCLUDE_DIR GLES2/gl2.h
     PATHS ${_GL_INCDIRS} NO_DEFAULT_PATH)

where _GL_INCDIRS is the path list reported by pkg-config.
So specifying an empty Cflags would also fail because
no paths at all are searched.

Peter