c++: adjust the extra ; warning [PR113760]

A minimal fix to quash an extra ; warning.  I have a more complete
patch for GCC 15.

	DR 1693
	PR c++/113760

gcc/cp/ChangeLog:

	* parser.cc (cp_parser_member_declaration): Only pedwarn about an extra
	semicolon in C++98.

gcc/testsuite/ChangeLog:

	* g++.dg/semicolon-fixits.C: Run in C++98 only.
	* g++.dg/warn/pedantic2.C: Adjust dg-warning.
	* g++.old-deja/g++.jason/parse11.C: Adjust dg-error.
	* g++.dg/DRs/dr1693-1.C: New test.
	* g++.dg/DRs/dr1693-2.C: New test.

gcc/cp/parser.cc

@@ -27999,7 +27999,7 @@ cp_parser_member_declaration (cp_parser* parser)
       if (!decl_specifiers.any_specifiers_p)
 	{
 	  cp_token *token = cp_lexer_peek_token (parser->lexer);
-	  if (!in_system_header_at (token->location))
+	  if (cxx_dialect < cxx11 && !in_system_header_at (token->location))
 	    {
 	      gcc_rich_location richloc (token->location);
 	      richloc.add_fixit_remove ();

gcc/testsuite/g++.dg/DRs/dr1693-1.C

@@ -0,0 +1,9 @@
+// DR 1693, Superfluous semicolons in class definitions
+// PR c++/113760
+// { dg-do compile }
+// { dg-options "" }
+
+struct S {
+  int a;
+  ;
+};

gcc/testsuite/g++.dg/DRs/dr1693-2.C

@@ -0,0 +1,9 @@
+// DR 1693, Superfluous semicolons in class definitions
+// PR c++/113760
+// { dg-do compile }
+// { dg-options "-pedantic-errors" }
+
+struct S {
+  int a;
+  ;	    // { dg-error "extra" "" { target c++98_only } }
+};

gcc/testsuite/g++.dg/semicolon-fixits.C

@@ -1,3 +1,4 @@
+// { dg-do compile { target c++98_only } }
 /* { dg-options "-fdiagnostics-show-caret -Wpedantic" } */
 
 /* Struct with extra semicolon.  */

gcc/testsuite/g++.dg/warn/pedantic2.C

@@ -5,6 +5,6 @@ class foo
   foo() {};
   void bar() {};
 
-  foo(int) {};;  // { dg-warning "extra" }
-  void bar(int) {};;  // { dg-warning "extra" }
+  foo(int) {};;  // { dg-warning "extra" "" { target c++98_only } }
+  void bar(int) {};;  // { dg-warning "extra" "" { target c++98_only } }
 };

gcc/testsuite/g++.old-deja/g++.jason/parse11.C

@@ -3,7 +3,7 @@
 
 class aClass 
 { 
-  ; // { dg-error "" } missing declaration
+  ; // { dg-error "" "" { target c++98_only } } missing declaration
 private: 
-  ; // { dg-error "" } missing declaration
+  ; // { dg-error "" "" { target c++98_only } } missing declaration
 };