qt5multimedia: fix build issue with mesa3d w/out xcb

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 qsgvideonode_egl.h:48,
	                 from qsgvideonode_egl.cpp:40:
	/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:550: recipe for target '.obj/qsgvideonode_egl.o' failed

[1]: https://github.com/mesa3d/mesa/blob/79ee1b2ff0b85f4eeb4165d23a7943c28d3a3d93/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>

diff --git a/package/qt5/qt5multimedia/qt5multimedia.mk b/package/qt5/qt5multimedia/qt5multimedia.mk
index 6df96bcab460f9034a8fbfd24c3533a679345777..041ef49092a44ccb16d84ba031d3d7be2db860bb 100644 (file)
--- a/package/qt5/qt5multimedia/qt5multimedia.mk
+++ b/package/qt5/qt5multimedia/qt5multimedia.mk
@@ -34,8 +34,15 @@ ifeq ($(BR2_PACKAGE_ALSA_LIB),y)
 QT5MULTIMEDIA_DEPENDENCIES += alsa-lib
 endif
 
+# The mesa's EGL/eglplatform.h header includes X11 headers unless the flag
+# MESA_EGL_NO_X11_HEADERS is defined. Tell to not include X11 headers if
+# the libxcb is not selected.
+ifeq ($(BR2_PACKAGE_MESA3D_OPENGL_EGL)x$(BR2_PACKAGE_LIBXCB),yx)
+QT5MULTIMEDIA_QMAKEFLAGS += QMAKE_CXXFLAGS+=-DMESA_EGL_NO_X11_HEADERS
+endif
+
 define QT5MULTIMEDIA_CONFIGURE_CMDS
-       (cd $(@D); $(TARGET_MAKE_ENV) $(HOST_DIR)/bin/qmake)
+       (cd $(@D); $(TARGET_MAKE_ENV) $(HOST_DIR)/bin/qmake $(QT5MULTIMEDIA_QMAKEFLAGS))
 endef
 
 define QT5MULTIMEDIA_BUILD_CMDS