[Bug fortran/27866] Warn when casting, e.g. assigning a double precision to a real

["manu at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #5 from manu at gcc dot gnu dot org  2007-02-16 21:08 -------
(In reply to comment #4)
> (In reply to comment #3)
> 
> > There is a new -Wconversion implementation. Perhaps you could do the same for
> > fortran as I did for C/C++. Take a look at c-common.c (conversion_warnings). It
> > would be great if -Wconversion behaves the same way (more or less) in all
> > front-ends.
> 
> This would be a good idea.
> 
> Looking at the code from c-common.c, we should warn about
> 

That is up to you. I don't know so much about fortran. I was just pointing to
the middle-end functions used in c-common.c to detect whether a value is
changed by the conversion. However, be careful about not warning in excess. For
example, constant integer division does not change any value, so I think it is
not appropriate for -Wconversion. But I guess that it is up to fortran
maintainers to make this decision.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27866