[fortran, patch] Improve module version error messages

[Steve Kargl]

On Sat, Mar 03, 2012 at 10:53:24AM +0100, FX wrote:
> Hi all,
> 
> Attached patch was triggered by PR 52313 (http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52313), and tries to improve error messages for module reading. It fixes one spelling of "GFORTRAN" --> "GNU Fortran" and improves the error reporting of old *unversioned* format from:
> 
> > Parse error when checking module version for file 'blah.mod' opened at (1)
> 
> 
> to:
> 
> > Cannot read module file 'blah.mod' opened at (1), because it was created by an older version of GNU Fortran
> 
> 
> 
> In addition, I looked at the message emitted for old, *versioned* format:
> 
> > Wrong module version '6' (expected '9') for file 'blah.mod' opened at (1)
> 
> 
> I think this message is not actually clearer to the user than the new one, so I substituted the new message to it too. That means we don't present the version strings (which are currently numbers) to the user, and it also seems better to me: those are for internal use anyway, and not documented. They're useful only to us, and they're written in the module file anyway.
> 
> So, bootstrapped and regtested on x86_64-apple-darwin11, OK for trunk?
> 
> FX
>  

OK.

-- 
Steve