[gcc r12-5511] c++: Return early in apply_late_template_attributes if there are no late attribs [PR101180]

[gcc r12-5511] c++: Return early in apply_late_template_attributes if there are no late attribs [PR101180]

[Jakub Jelinek]

https://gcc.gnu.org/g:8e86218f05c1a866b43ae5af3e303f91fb6d7ff0

commit r12-5511-g8e86218f05c1a866b43ae5af3e303f91fb6d7ff0
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Thu Nov 25 08:39:35 2021 +0100

    c++: Return early in apply_late_template_attributes if there are no late attribs [PR101180]
    
    The r12-299-ga0fdff3cf33f7284 change can result in cplus_decl_attributes being called
    even if there are no late attributes (but at least one early attribute) in
    apply_late_template_attributes.  This patch fixes that, so that we return early
    if there are no late attrs, only arrange for TYPE_ATTRIBUTES to get the early
    attribute list.
    
    2021-11-25  Jakub Jelinek  <jakub@redhat.com>
    
            PR c++/101180
            * pt.c (apply_late_template_attributes): Return early if there are no
            dependent attributes.

Diff:
---
 gcc/cp/pt.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c
index 49e5745410e..221628ad3a3 100644
--- a/gcc/cp/pt.c
+++ b/gcc/cp/pt.c
@@ -11712,6 +11712,9 @@ apply_late_template_attributes (tree *decl_p, tree attributes, int attr_flags,
   /* Apply any non-dependent attributes.  */
   *p = nondep;
 
+  if (nondep == attributes)
+    return true;
+
   /* And then any dependent ones.  */
   tree late_attrs = NULL_TREE;
   tree *q = &late_attrs;