Hi All Recently I added the -O3 flag to compile gfortran code. The application uses OPEN() call to open files. These calls are made in a sequence, one after another to open about 4 files before any operation on any of these files are performed. This code works fine when compiled with no Optimization flags. However upon adding the Optimization flags (be it -O or -O3), the first OPEN() works fine and the next OPEN() call fails. I suspect that the optimization flag turns on some check which may be causing this failure. I would very much appreciate your help and advice on what may be the reason for such a behaviour. Thanks in advance With Regards Vardhan
