[Bug lto/44463] whopr does not work with weak functions

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44463

Jan Hubicka <hubicka at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |NEW
                 CC|                            |rguenther at suse dot de

--- Comment #7 from Jan Hubicka <hubicka at gcc dot gnu.org> 2011-01-07 00:52:34 UTC ---
Richi,
I am going to post alias fix that resolve most of breakness, but we still have
multiple decl problem with 1to1.

The reason is simple, there is 
void x(void) __attribute__((weak, alias("y"))); 
in one unit and
void x(void) { printf("strong\n"); }
in the other, so it is alias that gets prevailed by real function body. 
lto-symtab handles that but we end up with two declarations, one in cgraph (the
one with body) and other in alias pairs as those are not subject of merging.

I think when merging decls, we need to remove associated alias pairs too. 
lto-symtab is mostly yours, any idea how this can be best implemented?

Unasigning myself until this is discussed better.

Honza