[Patch, fortran] PR24398 - broken module files

[Paul Thomas]

This patch deals with a problem in which something other than a gfortran 
module file was given to read_module; the resulting error was more than 
a little incomprehensible.  The fix is to verify that the first two 
words of the first line read "GFORTRAN module", using module.c's 
parser.  I do not see any point in a testcase for this.

Regtested on FC5/Athlon - Steve Kargl has OK'd this on the PR, so I will 
submit tonight.

Paul

2006-10-10  Paul Thomas  <pault@gcc.gnu.org>

    PR fortran/24398
    * module.c (gfc_use_module): Check that the first words in a
    module file are 'GFORTRAN module'.


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