1 files changed, 10 insertions, 0 deletions
diff --git a/gcc/cp/parser.cc b/gcc/cp/parser.cc
index f519ab0..94069d7 100644
--- a/gcc/cp/parser.cc
+++ b/gcc/cp/parser.cc
@@ -25770,6 +25770,16 @@ cp_parser_parameter_declaration_clause (cp_parser* parser,
      omitted.  */
   else if (token->type == CPP_ELLIPSIS)
     {
+      /* Deprecated by P3176R1 in C++26.  */
+      if (warn_deprecated_variadic_comma_omission)
+	{
+	  gcc_rich_location richloc (token->location);
+	  richloc.add_fixit_insert_before (", ");
+	  warning_at (&richloc, OPT_Wdeprecated_variadic_comma_omission,
+		      "omission of %<,%> before varargs %<...%> is "
+		      "deprecated in C++26");
+	}
+
       /* Consume the `...' token.  */
       cp_lexer_consume_token (parser->lexer);
       /* And remember that we saw it.  */