C: fix-it hint for removing stray semicolons

gcc/c/ChangeLog:
	* c-parser.c (c_parser_struct_or_union_specifier): Add fix-it
	hint for removing extra semicolon.

gcc/testsuite/ChangeLog:
	* gcc.dg/semicolon-fixits.c: New test case.

From-SVN: r247243

gcc/c/ChangeLog

+2017-04-25  David Malcolm  <dmalcolm@redhat.com>
+
+	* c-parser.c (c_parser_struct_or_union_specifier): Add fix-it
+	hint for removing extra semicolon.
+
 2017-04-21  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c/80468

gcc/c/c-parser.c

@@ -2948,8 +2948,13 @@ c_parser_struct_or_union_specifier (c_parser *parser)
 	  /* Parse any stray semicolon.  */
 	  if (c_parser_next_token_is (parser, CPP_SEMICOLON))
 	    {
-	      pedwarn (c_parser_peek_token (parser)->location, OPT_Wpedantic,
-		       "extra semicolon in struct or union specified");
+	      location_t semicolon_loc
+		= c_parser_peek_token (parser)->location;
+	      gcc_rich_location richloc (semicolon_loc);
+	      richloc.add_fixit_remove ();
+	      pedwarn_at_rich_loc
+		(&richloc, OPT_Wpedantic,
+		 "extra semicolon in struct or union specified");
 	      c_parser_consume_token (parser);
 	      continue;
 	    }

gcc/testsuite/ChangeLog

 2017-04-25  David Malcolm  <dmalcolm@redhat.com>
 
+	* gcc.dg/semicolon-fixits.c: New test case.
+
+2017-04-25  David Malcolm  <dmalcolm@redhat.com>
+
 	* g++.dg/lookup/missing-std-include.C: New test file.
 
 2017-04-25  Ramana Radhakrishnan  <ramana.radhakrishnan@arm.com>

gcc/testsuite/gcc.dg/semicolon-fixits.c

+/* { dg-options "-fdiagnostics-show-caret -Wpedantic" } */
+
+/* Struct with extra semicolon.  */
+struct s1 { int i;; }; /* { dg-warning "19: extra semicolon in struct or union specified" } */
+/* { dg-begin-multiline-output "" }
+ struct s1 { int i;; };
+                   ^
+                   -
+   { dg-end-multiline-output "" } */
+
+/* Union with extra semicolon.  */
+union u1 { int i;; }; /* { dg-warning "18: extra semicolon in struct or union specified" } */
+/* { dg-begin-multiline-output "" }
+ union u1 { int i;; };
+                  ^
+                  -
+   { dg-end-multiline-output "" } */