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/GNU Fortran 7

3.8 GFORTRAN_OPTIONAL_PLUS—Print leading + where permitted

If the first letter is ‘y’, ‘Y’ or ‘1’, a plus sign is printed where permitted by the Fortran standard. If the first letter is ‘n’, ‘N’ or ‘0’, a plus sign is not printed in most cases. Default is not to print plus signs.

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https://gcc.gnu.org/onlinedocs/gcc-7.1.0/gfortran/GFORTRAN_005fOPTIONAL_005fPLUS.html