[gcc r13-3550] c++: apply friend attributes sooner

[Jason Merrill <jason@gcc.gnu.org>]

https://gcc.gnu.org/g:38a628f52cf0ff5db6708578248484d50a50b366

commit r13-3550-g38a628f52cf0ff5db6708578248484d50a50b366
Author: Jason Merrill <jason@redhat.com>
Date:   Fri Oct 28 10:45:06 2022 -0400

    c++: apply friend attributes sooner
    
    Comparing attributes between declarations of a friend function has been
    complicated by pushdecl happening before decl_attributes.  I assumed there
    was some complicated reason we weren't calling decl_attributes here, but it
    doesn't break anything.
    
    gcc/cp/ChangeLog:
    
            * decl.cc (grokdeclarator): Call decl_attributes before do_friend.

Diff:
---
 gcc/cp/decl.cc | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/gcc/cp/decl.cc b/gcc/cp/decl.cc
index bc085f8fcce..c7f1937ea48 100644
--- a/gcc/cp/decl.cc
+++ b/gcc/cp/decl.cc
@@ -14206,13 +14206,16 @@ grokdeclarator (const cp_declarator *declarator,
 	    else if (decl && DECL_NAME (decl))
 	      {
 		set_originating_module (decl, true);
-		
+
 		if (initialized)
 		  /* Kludge: We need funcdef_flag to be true in do_friend for
 		     in-class defaulted functions, but that breaks grokfndecl.
 		     So set it here.  */
 		  funcdef_flag = true;
 
+		cplus_decl_attributes (&decl, *attrlist, 0);
+		*attrlist = NULL_TREE;
+
 		decl = do_friend (ctype, unqualified_id, decl,
 				  flags, funcdef_flag);
 		return decl;