MATLAB: How to set breakpoints in multiple MEX files using DDD or GDB when debugging MEX files in MATLAB 7.8 (R2009a)

MATLAB

I have a complex MATLAB program that I'm trying to interface and debug with some fairly complex C/C++ code. So I have multiple mex-files created to call different C/C++ functions from an external library. I need some help in setting the breakpoints when I run MATLAB within a debuggger.
I'm currently using ddd which is just a frontend to gdb. The examples in the MATLAB documentation only deal with the simple example of debugging a single mex-file. How do I specify a breakpoint for a specific mex-file?
If I type 'break mexFunction' as specified in the simple example in the documentation. I just get a breakpoint for the very first mexFunction that is called. And if I type break foo.c:mexFunction to stop at the entry point for a specific mex-file, I get the response "No source file named foo.c"
Are there any suggestions or methods to debug mex-files in this situation?

Best Answer

Here is an example of setting breakpoints in two MEX files. The example uses the following files:
1) timestwo.mexw32 % Refer to MATLAB documentation for code sample
2) yprime.mexw32 % Refer to MATLAB documentation for code sample
3) debugMexGDB.m: A MATLAB function that calls the above two MEX files as follows:
yprime(1:1,4)
disp('Hello world')
timestwo
Run the following commands in a Unix shell for debugging:
 matlab -Dgdb    # Launch MATLAB in gdb
 run -nojvm
 >> dbstop in debugMexGDB  # You are currently inside MATLAB
 >> dbmex on
 >> debugMexGDB
 K>> dbstep  # You are currently inside debugMexGDB
 (gdb) break yprime.c:mexFunction   # You are currently inside yprime
 (gdb) break timestwo.c:10
 (gdb) continue
 K>> dbstep   # You are currently inside debugMexGDB
 Hello world
 K>> dbstep
 (gdb) continue        # You are currently inside timestwo
 (gdb) quit
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