Add -debug in the compile command line and solve the 'segmentation fault'. Reason?

[xlong@ncsu_edu]

After trying many times, finally I can run through CAM if I add a -debug argument in the configure command line.

I make many changes to reproduce the segmentation fault error, and I am sure what makes the model work is the -debug option.

The information about the -debug argument is :
-debug
Switch to turn on building CAM with compiler options for debugging.

Does anyone have any idea about how the -debug will change the executable and cause the run time error 'segmentation error'?

Thank you very much.

 

[xlong@ncsu_edu]

I use CAM5.1.1.

And the version of pgf90 is pgi10.5.

 

[eaton]

The most common reason that turning on debug flags will allow code to run is that it changes the optimization level. This points to a bug in the compiler associated with optimization, or sometimes with the OMP threading. Unfortunately we often run into this kind of problem, and not just with PGI, but with all compilers. So typically the best solution is to try using another compiler. The current versions of PGI are 12.x.