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Fortran/gfortran
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How do I force gfortran to stop program at first NaN?
-ffpe-trap=invalid
How do I force gfortran to stop at a first floating point exception?
-ffpe-trap=zero,overflow
What optimization does gfortran support?
O0, O1, O2, O3, Os, Ofast, Og.
How do I debug?
Use gdb.
External links
optimization options