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Description of problem:
The following code triggers a segfault with gfortran. I don't know what it means but gfortran shouldn't segfault anyway.

      SUBROUTINE MNMNOT

# 18 "/home/dumas/rpmbuild/mnmnot.F" 2
      RETURN
      END

[dumas@chapelle cernlib_work]$ gfortran -c mnmnot.f -o mnmnot.o
<built-in>:0: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://bugzilla.redhat.com/bugzilla> for instructions.

Notice that it doesn't segfault when the file is renamed to .F.
[dumas@chapelle cernlib_work]$ gfortran -c mnmnot.F -o mnmnot.o
line-map.c: file "/home/dumas/rpmbuild/mnmnot.F" left but not entered



Version-Release number of selected component (if applicable):
gcc-gfortran-4.0.0-13

How reproducible:
Always

Steps to Reproduce:
1. compile the above file with .f
2.
3.
  

Actual Results:  gfortran segfaults

Expected Results:  an error message

Additional info: