ISO_FORTRAN_ENV or -fdefault-real-8 to promote reals to double precision

Question

I\'ve always been using the -fdefault-real-8 option of gfortran to automatically promote every single REAL declared anywhere in the pr

Answer 1

If you just want to silence the warning and you do not care about the implications -fdefault-real-8 has on storage association and some Fortran standard requirements, just do not import NUMERIC_STORAGE_SIZE from the module. For example,

USE, INTRINSIC :: ISO_FORTRAN_ENV, only: INPUT_UNIT,OUTPUT_UNIT,ERROR_UNIT