re PR c/81779 (bool define from stdbool.h suppresses -Wdeclaration-after-statement)

	PR c/81779
	* c-parser.c (c_parser_compound_statement_nostart): Call
	expansion_point_location_if_in_system_header.

	* gcc.dg/pr81779.c: New test.

From-SVN: r257271

gcc/c/ChangeLog

+2018-01-31  Marek Polacek  <polacek@redhat.com>
+
+	PR c/81779
+	* c-parser.c (c_parser_compound_statement_nostart): Call
+	expansion_point_location_if_in_system_header.
+
 2018-01-17  David Malcolm  <dmalcolm@redhat.com>
 
 	PR c++/83814

gcc/c/c-parser.c

@@ -4975,6 +4975,7 @@ c_parser_compound_statement_nostart (c_parser *parser)
   while (c_parser_next_token_is_not (parser, CPP_CLOSE_BRACE))
     {
       location_t loc = c_parser_peek_token (parser)->location;
+      loc = expansion_point_location_if_in_system_header (loc);
       if (c_parser_next_token_is_keyword (parser, RID_CASE)
 	  || c_parser_next_token_is_keyword (parser, RID_DEFAULT)
 	  || (c_parser_next_token_is (parser, CPP_NAME)

gcc/testsuite/ChangeLog

+2018-01-31  Marek Polacek  <polacek@redhat.com>
+
+	PR c/81779
+	* gcc.dg/pr81779.c: New test.
+
 2018-01-31  Jakub Jelinek  <jakub@redhat.com>
 
 	PR fortran/84116

gcc/testsuite/gcc.dg/pr81779.c

+/* PR c/81779 */
+/* { dg-do compile } */
+/* { dg-options "-Wdeclaration-after-statement" } */
+
+#include <stdbool.h>
+
+bool
+f2 (char *p)
+{
+  if (!p)
+    return false;
+
+  bool ret = true; /* { dg-warning "ISO C90 forbids mixed declarations and code" } */
+  return ret;
+}