[Bug fortran/51578] [4.3/4.4/4.5/4.6/4.7 Regression]

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51578

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.6.3

--- Comment #1 from Tobias Burnus <burnus at gcc dot gnu.org> 2011-12-16 14:11:52 UTC ---
The problem is the following in module.c's read_module:

              /* Delete the symtree if the symbol has been added by a USE
                 statement without an ONLY(11.3.2).  Remember that the rsym
                 will be the same as the symbol found in the symtree, for
                 this case.  */
              if (st && (only_flag || info->u.rsym.renamed)
                     && !st->n.sym->attr.use_only
                     && !st->n.sym->attr.use_rename
                     && info->u.rsym.sym == st->n.sym)
                gfc_delete_symtree (&gfc_current_ns->sym_root, name);

The goal is to get it working for:
  use mod1, oxx=>axx
  use mod2
and
  use mod2, oxx=>axx
  use mod1
and with the two lines flipped. But also for combinations such as:
  use mod1
  use mod2, oxx=>axx
  use mod1, only :
  use mod2

But avoid the import of "axx" for:
  use mod2, oxx=>axx
  use mod2
and for having twice "mod1" and for having the line order flipped.


I think one way would be to revamp the import procedure by reading first all
USE lines - consolidating the rename/only information for a module and then
start reading the modules.

(I think host-association of use-associated variables mixed with use statements
should not cause problems, but one should check.