[Bug 749461] New: faad2 plugin can't recognize faad2 version due to GCC-5.0 preprocessor changes

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=749461

            Bug ID: 749461
           Summary: faad2 plugin can't recognize faad2 version due to
                    GCC-5.0 preprocessor changes
    Classification: Platform
           Product: GStreamer
           Version: 1.4.5
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: gabemarcano at yahoo.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 303457
  --> https://bugzilla.gnome.org/attachment.cgi?id=303457&action=edit
gst-plugins-faad-1.4.5-configure-ac-gcc-5-fix.patch

When building the faac plugin for gst-plugins-bad, GCC-5.0 changed the behavior
of the -E preprocessor flag. This breaks autoconf's AC_EGREP_CPP behavior used
to extract the version number of the faac2 library. I was able to patch the
configure script for version 1.4.5 of gst-plugins-bad (see
https://bugs.gentoo.org/show_bug.cgi?id=549612 for details on that).
configure.ac still needs to be fixed.

In theory, according to the GCC porting docs, the only new flag that needs to
be added to CPPFLAGS somehow is "-P." I am attaching a patch that does just
that, which saves the CPPFLAGS, appends "-P", lets AC_EGREP_CPP do its job, and
then restores the original CPPFLAGS. I've tested it on my system (Gentoo Linux,
unstable, GCC 5.1) and it works, although I don't really like having to mess
with CPPFLAGS directly. Thought?

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