[Bug 754464] New: Add support for g_autoptr() and friends

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=754464

            Bug ID: 754464
           Summary: Add support for g_autoptr() and friends
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: xclaesse at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

It would be nice if all GStreamer libraries (those who install header files)
define the autoptr function for all their typedefs, using one of those macro:
G_DEFINE_AUTO_CLEANUP_CLEAR_FUNC
G_DEFINE_AUTO_CLEANUP_FREE_FUNC
G_DEFINE_AUTOPTR_CLEANUP_FUNC

That would allow:
 - Use of G_DECLARE_* in GStreamer itself and in applications using it when
subclassing a gst type.
 - Use of g_autoptr() in applications that don't care about other compilers
than gcc/clang. Notably GStreamer itself shouldn't use it to keep compat with
MSVC.

Note that it doesn't mean that GStreamer itself would depend on gcc/clang since
those macro does nothing when not supported by the compiler.

Those macros are new in glib 2.44, and GStreamer isn't probably going to depend
on it any time soon (is it?). But applications using gst often can depend on
newer glib, so it would make sense to add a gst-autocleanups.h file like the
one in gobject/gio/gtk but starting with a #ifdef
G_DEFINE_AUTOPTR_CLEANUP_FUNC.

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