[Bug fortran/40737] Pointer references sometimes fail to define "span" symbols

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

------- Comment #10 from burnus at gcc dot gnu dot org  2009-10-07 08:20 -------
(In reply to comment #8)
> Created an attachment (id=18732)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=18732&action=view) [edit]
> Potential patch to fix pr40737
> 
> Here is a patch from Adhemerval Zanella from our IBM LTC Performance team,
> that "fixes" the problem for me and bootstraps (powerpc64-linux) and
> regtests with no regressions.  Can someone else give this a try on their
> system?

I think it only paper bags the problem. The problem is that the span
information needs to be available in all places where the pointer is available
- also if the module a separate file from the one where the assignment is done
which can be again separate from the place where the pointer is used.

Thus, as written, I only see two solutions:

Solution 1: Always create that variable if they symbols is a pointer to an
array.
Solution 2: Defer it until we have the proper array descriptor, which handles
this.

I think in 4.6 we will finally go for solution 2.

Nevertheless, one should check whether the patch improves the situation for 4.5
and should thus be applied as interim solution.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40737