For IA-32 applications, the Intel® Fortran Compiler provides runtime diagnostic checks to aid debugging. The compiler provides a set of options that identify certain conditions commonly attributed to runtime failures.
You must specify the options when the program is compiled. However, they perform checks or produce information when the program is run. Postmortem reports provide additional diagnostics according to the detail you specify.
Runtime diagnostics are handled by IA-32 options only. The use of -O0 option turns any of them off.