Use weak functions to handle lack of gbm modifiers

Add weak function declaration and check if they're valid prior
to calling the functions.

This allows us to remove conditional compilation, yet allowing the
modifiers codepath to work if API is available.

Cc: Christian Gmeiner <christian.gmeiner@gmail.com>
Cc: Rob Clark <robdclark@gmail.com>
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Reviewed-by: Rob Clark <robdclark@gmail.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/common.h b/common.h
index dc87825..42eb236 100644
--- a/common.h
+++ b/common.h
@@ -57,6 +57,8 @@ EGLAPI EGLSurface EGLAPIENTRY eglCreatePlatformPixmapSurfaceEXT (EGLDisplay dpy,
 #endif
 #endif /* EGL_EXT_platform_base */
 
+#define WEAK __attribute__((weak))
+
 struct gbm {
 	struct gbm_device *dev;
 	struct gbm_surface *surface;