[Bug fortran/57522] New: [F03] ASSOCIATE construct creates array descriptor with incorrect stride for derived type array component

[alan.briolat at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57522

            Bug ID: 57522
           Summary: [F03] ASSOCIATE construct creates array descriptor
                    with incorrect stride for derived type array component
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: alan.briolat at gmail dot com

Created attachment 30254
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30254&action=edit
Code demonstrating the bug

The attached code demonstrates a bug (reproducible on 4.6 to 4.9) where using
ASSOCIATE to reference a derived type component in an array appears to have the
wrong stride.  The output is:

           0           1           2           3
           0           4           1           5

when it should be (and is under ifort):

           0           1           2           3
           0           1           2           3

This is probably related to bug 49636, but is a simpler case.  It's also
probably related to http://gcc.gnu.org/wiki/ArrayDescriptorUpdate (which I
found via that bug).  However, if the changes necessary to support this sort of
reference are "future ABI-breaking work", then the current version really
should warn/error rather than generating the wrong stride and silently doing
the wrong thing.