[Buildroot] [PATCH 4/4] webkitgtk: Ensure that Mesa headers do not include X11 headers on Wayland builds

[Thomas Petazzoni <thomas.petazzoni@free-electrons.com>]

Hello,

On Thu, 13 Jul 2017 02:55:31 +0300, Adrian Perez de Castro wrote:

> diff --git a/package/webkitgtk/webkitgtk.mk b/package/webkitgtk/webkitgtk.mk
> index ef20839f92..09781c2318 100644
> --- a/package/webkitgtk/webkitgtk.mk
> +++ b/package/webkitgtk/webkitgtk.mk
> @@ -84,6 +84,9 @@ endif
>  ifeq ($(BR2_PACKAGE_LIBGTK3_WAYLAND),y)
>  WEBKITGTK_CONF_OPTS += -DENABLE_WAYLAND_TARGET=ON
>  endif
> +WEBKITGTK_CONF_OPTS += \
> +	-DCMAKE_C_FLAGS='$(TARGET_CFLAGS) -DMESA_EGL_NO_X11_HEADERS' \
> +	-DCMAKE_CXX_FLAGS='$(TARGET_CXXFLAGS) -DMESA_EGL_NO_X11_HEADERS'

I am not happy with this: such CFLAGS should be provided by the OpenGL
provider, through its pkg-config file, and consumers of the OpenGL
implementation should get those flags using pkg-config.

If we don't do this, then we need to add -DMESA_EGL_NO_X11_HEADERS
everywhere in all OpenGL consumers, which isn't nice.

We already have a few OpenGL providers that define these flags in
their .pc file:

package/mali-t76x/egl.pc:Cflags: -I${includedir} -DMESA_EGL_NO_X11_HEADERS
package/mali-t76x/glesv2.pc:Cflags: -I${includedir} -DMESA_EGL_NO_X11_HEADERS
package/nvidia-driver/gl.pc:Cflags: -I${includedir}  -DMESA_EGL_NO_X11_HEADERS
package/odroid-mali/odroid-mali.mk:     $(SED) "s/Cflags: /Cflags: -DMESA_EGL_NO_X11_HEADERS /" \

Thanks!

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com