[cairo-bugs] [Bug 87707] New: improve support for building against GL framework on Mac OS

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87707

            Bug ID: 87707
           Summary: improve support for building against GL framework on
                    Mac OS
           Product: cairo
           Version: unspecified
          Hardware: Other
                OS: Mac OS X (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: gl backend
          Assignee: cairo-bugs at cairographics.org
          Reporter: desrt at desrt.ca
        QA Contact: cairo-bugs at cairographics.org

On Mac OS, the GL headers are not installed along with the rest of the SDK in
/usr/include.  You find them instead in
/System/Library/Frameworks/OpenGL.framework/Headers.

One thing that is tricky, though, is that the headers are immediately in that
directory, and not in a GL subdirectory.  Cairo always does #include <GL/...>
which means that one cannot simply give the correct CFLAGS (or gl_CFLAGS) here.

One example is cairo-gl-gradient-private.h which has:

#if CAIRO_HAS_GL_SURFACE
#include <GL/gl.h>
#include <GL/glext.h>
#elif CAIRO_HAS_GLESV2_SURFACE
#include <GLES2/gl2.h>
#include <GLES2/gl2ext.h>
#endif

Making a symlink from 'GL' in the src/ subdir to the system Headers directory
lets the build proceed but this is probably not a great solution.  After src/
the tests are also failing on the assumption that GL implies GLX, but that's a
separate issue.

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