http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55848
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
AssignedTo|unassigned at gcc dot |rguenth at gcc dot gnu.org
|gnu.org |
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> 2013-01-02
15:30:45 UTC ---
The builtin does not prevail over the extern decl for some reason (but it's in
the symtab of course). builtins have LDPR_UNKNOWN resolution, the extern
has LDPR_RESOLVED_DYN.
So we end up with no prevailing decl ... and in
/* If there's not a prevailing symbol yet it's an external reference.
Happens a lot during ltrans. Choose the first symbol with a
cgraph or a varpool node. */
if (!prevailing)
{
prevailing = first;
/* For variables chose with a priority variant with vnode
attached (i.e. from unit where external declaration of
variable is actually used).
When there are multiple variants, chose one with size.
This is needed for C++ typeinfos, for example in
lto/20081204-1 there are typeifos in both units, just
one of them do have size. */
if (TREE_CODE (prevailing->symbol.decl) == VAR_DECL)
{
for (e = prevailing->symbol.next_sharing_asm_name;
e; e = e->symbol.next_sharing_asm_name)
if (!COMPLETE_TYPE_P (TREE_TYPE (prevailing->symbol.decl))
&& COMPLETE_TYPE_P (TREE_TYPE (e->symbol.decl)))
prevailing = e;
}
}
where we probably should prefer builtins as we never replace those
when fixing up the cgraph.
Mine.
