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Reputation: 507

Can gfortran reject code that is not standard Fortran 90?

For educational purposes, I have written some Fortran 90 code that I compile with gfortran. Is there any way I can make sure that the code will not compile if I use any features not supported by Fortran 90? For example, the class keyword introduced in Fortran 2003, elemental from Fortran 95, etc.

I am not so familiar with gfortran, but after some searching, I can't seem to find an answer online (I am googling along the lines of "gfortran compile only fortran 90". Maybe I don't know how to phrase my query correctly). Many thanks!

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