The mesa's EGL/eglplatform.h header includes X11 headers unless the flag
MESA_EGL_NO_X11_HEADERS is defined[1].
A build issue happens when mesa3d is selected as then OpenGL EGL backend
but the XCB library is not selected.
This commit tells qmake to pass the cflag MESA_EGL_NO_X11_HEADERS to
make and prevent from including the missing X headers.
The issue QTBUG-66233 is opened in the Qt tracker[1].
Fixes:
In file included from /home/gportay/src/buildroot/output-qt5.10/host/x86_64-buildroot-linux-gnu/sysroot/usr/include/EGL/egl.h:39:0,
from platform/graphics/opengl/Extensions3DOpenGLES.cpp:33:
/home/gportay/src/buildroot/output-qt5.10/host/x86_64-buildroot-linux-gnu/sysroot/usr/include/EGL/eglplatform.h:118:22: fatal error: X11/Xlib.h: No such file or directory
#include <X11/Xlib.h>
^
compilation terminated.
Makefile.WebCore.Target:93596: recipe for target '.obj/platform/graphics/opengl/Extensions3DOpenGLES.o' failed
[1]: 79ee1b2ff0/include/EGL/eglplatform.h (L109-L125)
[2]: https://bugreports.qt.io/browse/QTBUG-66233
[Peter: simplify logic]
Cc: Julien CORJON <corjon.j@ecagroup.com>
Signed-off-by: Gaël PORTAY <gael.portay@savoirfairelinux.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
e46f9fde78