[Bug 770987] New: configure.ac EGL checks clobber user EGL_LIBS/EGL_CFLAGS

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=770987

            Bug ID: 770987
           Summary: configure.ac EGL checks clobber user
                    EGL_LIBS/EGL_CFLAGS
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: a.j.buxton at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

If configure.ac finds EGL it sets EGL_CFLAGS to empty, and sets EGL_LIBS to a
fixed string:

https://cgit.freedesktop.org/gstreamer/gst-plugins-bad/tree/configure.ac#n789

Then later it sets GL_CLFAGS and GL_LIBS to empty:

https://cgit.freedesktop.org/gstreamer/gst-plugins-bad/tree/configure.ac#n826

And then finally it does this:

          GL_LIBS="$GL_LIBS -lEGL $EGL_LIBS"
          GL_CFLAGS="$GL_CFLAGS $EGL_CFLAGS"

At this point all the variables are empty. The result of this is that if you
need to specify EGL_CFLAGS/EGL_LIBS to make EGL work, then your options will
not be passed through to the actual compile.

This is for example the reason why you need to put loads of stuff into LDFLAGS,
CFLAGS, CPPFLAGS when building on the raspberry pi as in this bug:

https://bugzilla.gnome.org/show_bug.cgi?id=740530

Note that the Mali EGL detection branch does the same thing.

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