https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89341
--- Comment #4 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
The -Wattributes warning would be emitted here in cgraphunit.c:
process_function_and_variable_attributes:
777 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl))
778 && (node->definition && !node->alias))
779 {
780 warning_at (DECL_SOURCE_LOCATION (node->decl),
OPT_Wattributes,
781 "%<weakref%> attribute ignored"
782 " because function is defined");
783 DECL_WEAK (decl) = 0;
784 DECL_ATTRIBUTES (decl) = remove_attribute ("weakref",
785 DECL_ATTRIBUTES
(decl));
786 }
but the alias stops the clause from firing:
(gdb) p node
$3 = <cgraph_node * 0x7ffff18af2d0 "foo"/0>
(gdb) p node->definition
$4 = 1
(gdb) p node->alias
$5 = 1
The alias exclusion was added to the warning in r174952 (aka
c70f46b057cd12973d33c01c8fa0da5c14ba3944) by Honza:
@@ -880,7 +977,7 @@ process_function_and_variable_attributes (struct
cgraph_node *first,
cgraph_mark_needed_node (node);
}
if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl))
- && node->local.finalized)
+ && (node->local.finalized && !node->alias))
{
warning_at (DECL_SOURCE_LOCATION (node->decl), OPT_Wattributes,
"%<weakref%> attribute ignored"
