[Bug 794621] New: Library path switch in gst-libs/ext/Makefile.am causes cross compilation errors

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=794621

            Bug ID: 794621
           Summary: Library path switch in gst-libs/ext/Makefile.am causes
                    cross compilation errors
    Classification: Platform
           Product: GStreamer
           Version: 1.14.0
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-libav
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: dv at pseudoterminal.org
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

In gst-libs/ext/akefile.am , there is this line:

  echo "dependency_libs=' -L$(libdir) $(if $2,$(foreach
dep,$2,$(abs_builddir)/$(dep).la)) $(call find_library_la,$3
$(LIBM),$(LDFLAGS)) '" && \

When trying to cross compile gst-libav 1.14.0 with Yocto rocko, this causes a
problem.
libdir is set to /usr/lib, so -L/usr/lib is passed to the compiler. Yocto
detects this switch, and considers it a hard error.

It is possible that GCC indeed is translating the path properly, but Yocto sees
this path, and assumes that it is specifying an unsafe path to the host's
libraries. Either way, this makes it impossible to build gst-libav 1.14.0 with
Yocto.

Possible solutions are to either (a) stick with a Yocto patch against gst-libav
that removes the -L switch, (b) manually append the sysroot to this -L switch
path, or (c) silence the Yocto error (not recommended).

Note that other cross compilation environments that check the -I and -L paths
are also likely to encounter this problem.

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