re PR c/85318 (-Wc90-c99-compat does not warn about for loop initial declarations)

	PR c/85318
	* c-decl.c (check_for_loop_decls): Add -Wc90-c99-compat warning about
	for loop initial declarations.

	* gcc.dg/Wc90-c99-compat-10.c: New test.
	* gcc.dg/Wc90-c99-compat-11.c: New test.
	* gcc.dg/Wc90-c99-compat-12.c: New test.
	* gcc.dg/Wc90-c99-compat-9.c: New test.

From-SVN: r261293

gcc/c/ChangeLog

+2018-06-07  Marek Polacek  <polacek@redhat.com>
+
+	PR c/85318
+	* c-decl.c (check_for_loop_decls): Add -Wc90-c99-compat warning about
+	for loop initial declarations.
+
 2018-05-30  David Pagan  <dave.pagan@oracle.com>
 
 	PR c/55976

gcc/c/c-decl.c

@@ -9608,6 +9608,10 @@ check_for_loop_decls (location_t loc, bool turn_off_iso_c99_error)
 	}
       return NULL_TREE;
     }
+  else
+    pedwarn_c90 (loc, OPT_Wpedantic, "ISO C90 does not support %<for%> loop "
+		 "initial declarations");
+
   /* C99 subclause 6.8.5 paragraph 3:
 
        [#3]  The  declaration  part  of  a for statement shall only

gcc/testsuite/ChangeLog

+2018-06-07  Marek Polacek  <polacek@redhat.com>
+
+	PR c/85318
+	* gcc.dg/Wc90-c99-compat-10.c: New test.
+	* gcc.dg/Wc90-c99-compat-11.c: New test.
+	* gcc.dg/Wc90-c99-compat-12.c: New test.
+	* gcc.dg/Wc90-c99-compat-9.c: New test.
+
 2018-06-07  Paul Koning  <ni1d@arrl.net>
 
 	* gcc.c-torture/compile/20180605-1.c: New test.

gcc/testsuite/gcc.dg/Wc90-c99-compat-10.c

+/* PR c/85318 */
+/* { dg-do compile } */
+/* { dg-options "-std=gnu11 -Wc90-c99-compat -pedantic-errors" } */
+
+extern void bar (int);
+
+void
+foo (int n)
+{
+  for (int i = 0; i < n; i++) /* { dg-warning "ISO C90 does not support .for. loop" } */
+    bar (i);
+}

gcc/testsuite/gcc.dg/Wc90-c99-compat-11.c

+/* PR c/85318 */
+/* { dg-do compile } */
+/* { dg-options "-std=gnu11 -Wc90-c99-compat -Wno-pedantic" } */
+
+extern void bar (int);
+
+void
+foo (int n)
+{
+  for (int i = 0; i < n; i++) /* { dg-warning "ISO C90 does not support .for. loop" } */
+    bar (i);
+}

gcc/testsuite/gcc.dg/Wc90-c99-compat-12.c

+/* PR c/85318 */
+/* { dg-do compile } */
+/* { dg-options "-Wpedantic" } */
+
+extern void bar (int);
+
+void
+foo (int n)
+{
+  for (int i = 0; i < n; i++) /* { dg-bogus "ISO C90 does not support .for. loop" } */
+    bar (i);
+}

gcc/testsuite/gcc.dg/Wc90-c99-compat-9.c

+/* PR c/85318 */
+/* { dg-do compile } */
+/* { dg-options "-std=gnu99 -Wc90-c99-compat -pedantic-errors" } */
+
+extern void bar (int);
+
+void
+foo (int n)
+{
+  for (int i = 0; i < n; i++) /* { dg-warning "ISO C90 does not support .for. loop" } */
+    bar (i);
+}