[Bug fortran/55465] Name collision in C binding (calling C from Fortran)

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55465

Tobias Burnus <burnus at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
   Last reconfirmed|                            |2013-05-22
         Resolution|FIXED                       |---
     Ever confirmed|0                           |1

--- Comment #16 from Tobias Burnus <burnus at gcc dot gnu.org> ---
(In reply to Juno Krahn from comment #13)
> This issue was once discussed by members of the Fortran standards committee.
> I don't recall if that was on usenet or somewhere in the committee meeting
> notes. The conclusion was that it is useful to allow for multiple explicit
> interfaces in order to interface correctly with C libraries, and that the
> standards allow for it.

Well, at least some standard committee members believe that the code in comment
0 is invalid: http://mailman.j3-fortran.org/pipermail/j3/2013-May/006397.html

Let's open this PR - and use it to track the addition of some diagnostic. It
might be a warning or error, it might depend on -std= or not.