Hello, we are currently tracing a problem on some old Fortran code using G77 on an AMD 64 bit Opteron machine. We understood that local variables are put in the stack area (i.e. with addresses > 2**32), which causes our deprecated and ugly code to fail. Is there any option to force local variables to be in the same address area as those in COMMON? We have tried with -fno-automatic, but it doesn't seem to solve the problem. We are using gcc 3.3.1 under Suse linux. Thank you very much Riccardo Fantechi - Giuseppe Terreni INFN Pisa