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This has been discussed in the 1/9 Reflection thread, but doesn't depend on
reglection in any way.
cp_parser_std_attribute calls lookup_attribute_spec as:
const attribute_spec *as
= lookup_attribute_spec (TREE_PURPOSE (attribute));
so with TREE_LIST where TREE_VALUE is attribute name and TREE_PURPOSE
attribute ns. Similarly c_parser_std_attribute. And for
attribute_takes_identifier_p those do:
else if (attr_ns == gnu_identifier
&& attribute_takes_identifier_p (attr_id))
and
bool takes_identifier
= (ns != NULL_TREE
&& strcmp (IDENTIFIER_POINTER (ns), "gnu") == 0
&& attribute_takes_identifier_p (name));
when handling std attributes (for GNU attributes they just call those
with the IDENTIFIER_NODE name.
is_late_template_attribute and tsubst_attribute pass to these functions
just get_attribute_name though, so handle attributes in all namespaces
as GNU attributes only, which means that lookup_attribute_spec can
return NULL or find a different attribute if it is not from gnu:: or
say standard attribute mapped to gnu::, or attribute_takes_identifier_p
can return true even for attributes for which it shouldn't.
I thought about changing attribute_takes_identifier_p to take optionally
TREE_LIST, but that would mean handling it in the target hooks too and
they only care about GNU attributes right now, so given the above
parser.cc/c-parser.cc snippets, the following patch just follow
what they do.
2025-12-06 Jakub Jelinek <jakub@redhat.com>
* decl2.cc (is_late_template_attribute): Call lookup_attribute_spec
on TREE_PURPOSE (attr) rather than name. Only call
attribute_takes_identifier_p if get_attribute_namespace (attr) is
gnu_identifier.
* pt.cc (tsubst_attribute): Only call attribute_takes_identifier_p
if get_attribute_namespace (t) is gnu_identifier.
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