[Bug 791783] New: Fail to build on FreeBSD because of missing -Wl,-Bsymbolic

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=791783

            Bug ID: 791783
           Summary: Fail to build on FreeBSD because of missing
                    -Wl,-Bsymbolic
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: FreeBSD
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-libav
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: lantw44 at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Both ffmpeg and libav say that -Wl,-Bsymbolic should be used when linking a
static ffmpeg or libav library into a shared library.

https://libav.org/documentation/platform.html

However, gst-libav doesn't pass -Wl,-Bsymbolic to linker, and it causes linking
failure on FreeBSD.

  CCLD     libgstlibav.la
/usr/bin/ld:
/home/lantw44/gnome/build/gst-libav/gst-libs/ext/.libs/libavcodec.a(simple_idct10.o):
relocation R_X86_64_PC32 against `ff_pw_1023' can not be used when making a
shared object; recompile with -fPIC
/usr/bin/ld: final link failed: Bad value
cc: error: linker command failed with exit code 1 (use -v to see invocation)

If I put -Wl,-Bsymbolic in LDFLAGS, gst-libav can be successfully built.

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