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Home/ Questions/Q 844135
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Editorial Team
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Editorial Team
Asked: May 15, 20262026-05-15T06:14:19+00:00 2026-05-15T06:14:19+00:00

I am using gfortran to compile FORTRAN 77 and would like to have DEBUG

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I am using gfortran to compile FORTRAN 77 and would like to have DEBUG build options by using the preprocessor directive #ifdef. However, when I use them I get compile time warnings “Illegal preprocessor directive”. Is it possible to have this functionality without deviating from the standard toolchain?

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  1. Editorial Team
    Editorial Team
    2026-05-15T06:14:20+00:00Added an answer on May 15, 2026 at 6:14 am

    The c preprocessor can be used on the FORTRAN code for this purpose.

    http://gcc.gnu.org/onlinedocs/gfortran/Preprocessing-Options.html

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