[Bug 772555] debug: Implement gst_debug_print_stack_trace with libunwind/backtrace when avalaible

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=772555

--- Comment #9 from Guillaume Desmottes <gdesmott at gnome.org> ---
Review of attachment 337146:
 --> (https://bugzilla.gnome.org/review?bug=772555&attachment=337146)

I get linking errors when trying to build your branch. I guess we need to add
DW_LIBS to gst's LIBADD.

.libs/libgstreamer-1.0.so: undefined reference to `dwfl_begin'
./.libs/libgstreamer-1.0.so: undefined reference to `_Ux86_64_getcontext'
./.libs/libgstreamer-1.0.so: undefined reference to `dwfl_module_info'
./.libs/libgstreamer-1.0.so: undefined reference to `dwfl_report_end'
./.libs/libgstreamer-1.0.so: undefined reference to `dwfl_linux_proc_report'
./.libs/libgstreamer-1.0.so: undefined reference to
`dwfl_standard_find_debuginfo'
./.libs/libgstreamer-1.0.so: undefined reference to `_ULx86_64_get_reg'
./.libs/libgstreamer-1.0.so: undefined reference to `dwfl_getsrc'
./.libs/libgstreamer-1.0.so: undefined reference to `dwfl_module_addrname'
./.libs/libgstreamer-1.0.so: undefined reference to `_ULx86_64_step'
./.libs/libgstreamer-1.0.so: undefined reference to `dwfl_lineinfo'
./.libs/libgstreamer-1.0.so: undefined reference to `dwfl_addrmodule'
./.libs/libgstreamer-1.0.so: undefined reference to `_ULx86_64_init_local'
./.libs/libgstreamer-1.0.so: undefined reference to `dwfl_linux_proc_find_elf'

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