gfortran requires format widths while ifort doesn't?

Question

I am trying to migrate a .FOR file (for practice purposes) from ifort to gfortran. This file compiles in my Intel Visual Fortran solution with no issues. However when I comp

Answer 1

Your observation is correct, I have encountered this myself before. Intel Fortran does not enforce this requirement while gfortran does. The field width is actually required by the Fortran standard. I am not aware of any compiler option that could change this behaviour. The only option I am aware of is to fix the code to make it standard compliant.

How to do it can be found in Error: Nonnegative width required in format string at (1) . Note that the g0 that you asked about is not a compiler option to accept I. It is a different format descriptor to put into the code instead of I.