[FFmpeg-devel] gdb problem: Previous frame inner to this frame (gdb could not unwind past this frame)

[Jeff Crouse]

Hello ffmpeggers,

I have a custom avfilter that essentially just loads in a shared
object/library at runtime with init, process, and uninit functions.
It's great because I don't have to recompile ffmpeg every time I make
a change to my library. Then I just give the name to the library in
the -vf argument.  Everything is working fine for the most part, but
when I try to set a breakpoint in my library, GDB says:

Previous frame inner to this frame (gdb could not unwind past this frame)

And it just freezes up and doesn't give me a stack trace.  It's very
frustrating because I can't debug my code.  I am using XCode 3.2.4 on
a Macbook Pro, Mac OS X (10.6.4), with

svn co -r 25296 svn://svn.ffmpeg.org/ffmpeg/trunk

I'm not quite sure what other information to post, not how to start
diagnosing this problem.  From my googling, the "gdb could not unwind
past this frame" part of the error seems to be particular to Mac,
although it is similar to an error that GDB throws when it thinks that
the stack trace is corrupted.

Has anyone seen this before?

Thanks in advance,
-- 
Jeffrey Crouse
cell: 646-246-5999
http://www.jeffcrouse.info