How to debug on Mac platform MEX files built from multiple source files using Xcode?

I’d like to debug MEX files built from several source files but I have some trouble, the program never stop at any breakpoint! Here's what I did.

I have three source files wrote in c, one with the mexFunction and the others with some computational routines. I compiled those successfully in Matlab using mex –g. Then I created a project with Xcode following the instruction in Matlab documentation.

https://www.mathworks.com/help/matlab/matlab_external/debugging-on-mac-platforms.html

I set a breakpoint at the beginning of the mexFunction and ran the binary but the program never stops at the breakpoint.

I tried with the example provide in the documentation, yprime.c, and it works perfectly, every breakpoint that I set are hits.

I don’t see why it doesn’t work when I do the same but with multiple files.

Thanks for help!

Sam