http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57945
--- Comment #5 from Jan Hubicka <hubicka at ucw dot cz> ---
> Even better something that uses it and that even declares the original:
> extern int j;
> static int i __attribute__((weakref("j")));
>
> int
> foo (void)
> {
> return &i ? i : 0;
> }
>
> This ICEs with cc1plus even at -O2, since r199971. The problem is that
> node->alias_target is IDENTIFIER_NODE, some places cope with it being
> IDENTIFIER_NODE (in fact, I don't see where it would become something
> different), but some places just blindly assume it must be a DECL_P.
It is IDENTIFIER_NODE until it is "resolved" into a target symbol that
is a decl (and one gets proper reference edge in symbol table).
For normal aliases the identifier_node gets turned into a decl after
compilation unit is finalized (via resolve_alias). External weakrefs may
be never resolved...
