using gdb to step into 3rd party functions with shared libraries

I am using gdb and some shared libraries. I can get gdb to step into my own shared library, but not a 3rd party one.

When using gdb, I expect "s" (step) to step into the 3rd party library and show me the lines it is executing inside these opj_* functions instead of just going to the next line in my own shared library code.

I'm pretty sure I'm just missing something during compiling, having to do with linking (getting gcc to pass some debug flags to ld), but I don't know what it is, or something when running gdb to tell it where the debug symbols are.

Here are the details:

I have the openjpeg library, debug info and devel packages installed.

# zypper search -si openjpeg
Loading repository data...
Reading installed packages...

S | Name                     | Type    | Version   | Arch   | Repository
--+--------------------------+---------+-----------+--------+-----------
i | libopenjpeg2_0           | package | 2.0.0-1.4 | x86_64 | packman   
i | libopenjpeg2_0-debuginfo | package | 2.0.0-1.4 | x86_64 | packman   
i | openjpeg2-devel          | package | 2.0.0-1.4 | x86_64 | packman   

# rpm -ql libopenjpeg2_0
/usr/lib64/libopenjpeg.so.2.0
/usr/lib64/libopenjpeg.so.2.0.0

# rpm -ql openjpeg2-devel
/usr/include/openjpeg-2.0
/usr/include/openjpeg-2.0/openjpeg.h
/usr/lib64/libopenjpeg.so
/usr/lib64/openjpeg-2.0
/usr/lib64/openjpeg-2.0/OpenJPEGConfig.cmake
/usr/lib64/openjpeg-2.0/OpenJPEGTargets-release.cmake
/usr/lib64/openjpeg-2.0/OpenJPEGTargets.cmake

# rpm -ql libopenjpeg2_0-debuginfo
/usr/lib/debug
/usr/lib/debug/.build-id
/usr/lib/debug/.build-id/85/f8603c75aadee0bd66653332d7ce16d0292752
/usr/lib/debug/.build-id/85/f8603c75aadee0bd66653332d7ce16d0292752.debug
/usr/lib/debug/usr/lib64/libopenjpeg.so.2.0.0.debug

I have a shared library libjna_openjpeg linked to libopenjpeg.

I have a test program "pathtest" linked to libopenjpeg and libjna_openjpeg

I compiled each with "gcc -g ..." and also tried "gcc -ggdb ..."

gcc -ggdb -c -fpic -I/usr/include/openjpeg-2.0 jna_openjpeg.c -lopenjpeg
gcc -ggdb -shared -o libjna_openjpeg.so jna_openjpeg.o -lopenjpeg
gcc -ggdb -I/usr/include/openjpeg-2.0 -L. -o pathtest pathtest.c -ljna_openjpeg -lopenjpeg

A snippet of my shared library code with some comments removed:

opj_stream_t* p_stream = opj_stream_create_default_file_stream( p_file, p_is_read_stream );

opj_codec_t *p_decompressor = opj_create_decompress(CODEC_J2K);

// my bug I want to debug is here... this always returns 0
p_image =  opj_decode( p_decompressor, p_stream );

running gdb

$ gdp pathtest

...

(gdb) s
52          opj_codec_t *p_decompressor = opj_create_decompress(CODEC_J2K);
(gdb) s
59          p_image =  opj_decode( p_decompressor, p_stream );
(gdb) s

gdb version

# gdb --version
GNU gdb (GDB) SUSE (7.3-41.1.2)
...