I am very happy to see that gfortran from current gcc snapshots can successfully compile an 18000 lines Fortran 77 numerics program I wrote. Results are indeed the same as obtained with other compilers (g77, PGI, ifort), and also execution speed seems roughly comparable, although I haven't yet done any precise measurements. A big thank you to the developers for that!
Now I am trying to get the program to run with OpenMP, which works (although slower than anticipated) with PGI and ifort compilers. While I can successfully build and execute small OpenMP test programs, starting my large program fails with the message libgomp: Thread creation failed: Invalid argument resulting from a failing call to pthread_create() in libgomp/team.c. Using gdb I see that pthread_create() is called with the same gomp_thread_attr argument as for the smaller, succeeding testcases. strace shows that pthread_create() fails without trying to call clone(), while the clone() call of course does happen for the succeeding testcases. How to further debug this problem? I am currently using gcc-4.2-20060812 on i686 and x86_64 SuSE 10.0 Linux systems. Thank you, Tim
