RFC: PR 22552 and PR 39171

[Daniel Kraft <d at domob dot eu>]

Hi all,

PR 22552 and PR 39171 are two reports I just stumbled upon again, and I 
think we could try to find a result...  Comments welcome!

PR 22552:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22552
This is about adding a warning (presumably -Wimplicit-procedure) when a 
"undeclared" procedure is called.  Similar to -Wimplicit-interface, but 
this warning would also be content with an EXTERNAL declaration or 
defining the type for a function, even if no interface is explicitly 
given.  FX provided a patch and I did develop it further to a state 
where it can, if you think this warning reasonable, checked-in directly. 
 What do you think, should we do this?  Otherwise I'll mark the PR as 
WONTFIX.

PR 39171:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39171
When something like CHARACTER(LEN=-1) (negative charlength) is declared, 
there's currently a warning which is quite misleading, though (as it 
states the character length is zero; for actual zero length however, no 
warning is issued at all).  From a standard's point of view, a negative 
charlength is fine and will be treated like LEN=0; but I think a warning 
is a good idea in this case; and we should in any case fix the old 
misleading warning.  Do you think we should warn always or only with 
some -W... flag?  I'm willing to work out a patch for this if we get an 
agreement on what exactly to do here.

Thanks!

Daniel

--
Done:  Arc-Bar-Cav-Ran-Rog-Sam-Tou-Val-Wiz
To go: Hea-Kni-Mon-Pri