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I set up M-x compile to automatically run appropriate commands depend on on the file types. For example, for C++

(add-hook 'c++-mode-hook
          (lambda ()
            (set (make-local-variable 'compile-command)
                 (concat "g++ " buffer-file-name " && ./a.out"  ) )))

So everytime I have a .cpp file, it would run g++ filename && ./a.out.

For Fortran, I have the same thing:

(add-hook 'fortran-mode-hook
          (lambda ()
            (set (make-local-variable 'compile-command)
                 (concat "gfortran " buffer-file-name " && ./a.out"  ) )))

But this only works if the file extension is .f, .for. It does not work for file extensions .f95, .f90.....

Please let me know how to fix this.

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fortran-mode-hook only runs for buffers that end up in fortran-mode. To affect which extensions are recognized as fortran, you can modify auto-mode-alist, eg

(add-to-list 'auto-mode-alist '("\\.f9[50]" . fortran-mode))
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