Fortran90 doesn't compile with gfortran

Question

I am attempting to compile and run a Fortran 90 program using command line (bash). In the past, when I've run gfortran /path/to/file, a file a.out and a file program_name are created, and I can run the program by using ./program_name in the command line. For reasons I don't understand, the program_name file is no longer being created, and therefore when I attempt to run ./program_name, I get an error message No such file or directory. It does not appear to matter which .f90 file I use; I get the same results.

How do I get the program to compile properly so that I can run it?

Eric Postpischil · Accepted Answer · 2025-11-25 19:35:37Z

6

a.out is the compiled program; it is the executable file. That is the default name gfortran uses for its output file. Typing ./a.out in your command line would execute it.

To specify another name for the program, use the -o switch followed by the name:

gfortran -o program_name further arguments…

answered Nov 25 at 19:35

Eric Postpischil

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JDoe Nov 25 at 19:44

I'll mark this as correct, as running ./a.out does indeed produce the expected result. But any idea why things aren't working the way they used to?

Eric Postpischil Nov 25 at 19:53

The most likely explanations are that you were not executing gfortran directly, your memory is faulty, or you were executing some modified gfortran (could be as simple as script that interposed its own arguments and then executed the actual gfortran).

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