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2.4 Options for debugging your program or GNU Fortran

GNU Fortran has various special options that are used for debugging either your program or the GNU Fortran compiler.

Output the internal parse tree before starting code generation. Only really useful for debugging the GNU Fortran compiler itself.
Specify a list of IEEE exceptions when a Floating Point Exception (FPE) should be raised. On most systems, this will result in a SIGFPE signal being sent and the program being interrupted, producing a core file useful for debugging. list is a (possibly empty) comma-separated list of the following IEEE exceptions: `invalid' (invalid floating point operation, such as SQRT(-1.0)), `zero' (division by zero), `overflow' (overflow in a floating point operation), `underflow' (underflow in a floating point operation), `precision' (loss of precision during operation) and `denormal' (operation produced a denormal value).

See Options for Debugging Your Program or GCC, for more information on debugging options.