Static build fails to load libnice elements

[Aaron Clauson]

I'm experimenting with non-static and static gstreamer builds using the
gst-build on an Ubuntu docker image. In both cases I'm able to successfully
build gstreamer and compile my basic application that's using
a webrtcbin pipeline.

Note that static in this case is referring to the "Static build"
description from the gst-build readme (
https://gitlab.freedesktop.org/gstreamer/gst-build#static-build) rather
than attempting to link my executable with actual static libraries.

For the non-static build my application is able to run the
webrtcbin pipeline as expected. For static builds I get the warning below
about libnice and the pipeline fails to launch (I definitely have
libnice-dev installed and both docker images install an identical set of
packages).

0:00:54.272738800    16 0x558ef5419c00 WARN               webrtcbin
gstwebrtcbin.c:133:_have_nice_elements:<sendonly> error: libnice elements
are not available

My understanding with the static build was that all the plugins are
included in libgstreamer-full-1.0.so. The libnice symbols all seem to be in
that library:

root at 3600f52e3abd:/src/gst-webrtc-echo/builddir# nm
/usr/local/lib/x86_64-linux-gnu/libgstreamer-full-1.0.so | grep nice
0000000000caaf60 t _gst_nice_thread
0000000000c95700 t _have_nice_elements
0000000000cb2310 t _nice_agent_stream_ids_get_type
0000000000cb22f0 t _nice_agent_stream_ids_get_type_once
...

The meson command I'm using to generate the static build is:

meson -Dgood=enabled -Dgst-plugins-good:vpx=enabled \
  -Dgst-plugins-good:rtpmanager=enabled \
  -Dbad=enabled -Dgst-plugins-bad:dtls=enabled \
  -Dbad=enabled -Dgst-plugins-bad:srtp=enabled \
  -Dbad=enabled -Dgst-plugins-bad:webrtc=enabled \
  --default-library=static \
  builddir

And the command I then use to build my application is:

gcc gst-webrtc-echo.c -I/usr/include/gstreamer-1.0 -I/usr/include/glib-2.0
-I/usr/lib/x86_64-linux-gnu/glib-2.0/include
-I/usr/local/include/gstreamer-1.0 -L/usr/local/lib
-L/usr/local/lib/x86_64-linux-gnu -lgstreamer-full-1.0 -lglib-2.0
-lgmodule-2.0 -lgobject-2.0 -lgio-2.0 -lpthread -lm -ldl -lpcre -lffi
-levent -lcjson

If anybody can spot anything I might be doing wrong any suggestions would
be welcome.

Aaron
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