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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 compile it in gfortran using the following command:

gfortran -ffree-form -ffree-line-length-200 -Dinternal_debug -c MyFile.FOR -o MyFile.o

I get the following error message:

MyFile.FOR:4561:22:

   102     format(A, I)
                      1
Error: Nonnegative width required in format string at (1)

Does ifort simply not require there to be a format width or are there additional ifort options that enable relaxing this requirement? How come the file runs smoothly in ifort but not in gfortran?

user32882
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1 Answers1

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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.

Vladimir F Героям слава
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