re PR c/70791 (-Wnested-externs prints inconsistent column number)

	PR c/70791
	* c-decl.c (pushdecl): Pass LOCUS down to warning.

	* gcc.dg/Wnested-externs-2.c: New test.

From-SVN: r235447

gcc/c/ChangeLog

@@ -8,6 +8,9 @@
 	(c_parser_switch_statement): Use it.
 	(c_parser_while_statement): Use it.
 
+	PR c/70791
+	* c-decl.c (pushdecl): Pass LOCUS down to warning.
+
 2016-04-20  Ilya Verbin  <ilya.verbin@intel.com>
 
 	PR c++/69363

gcc/c/c-decl.c

@@ -2949,7 +2949,8 @@ pushdecl (tree x)
 	}
       if (scope != file_scope
 	  && !DECL_IN_SYSTEM_HEADER (x))
-	warning (OPT_Wnested_externs, "nested extern declaration of %qD", x);
+	warning_at (locus, OPT_Wnested_externs,
+		    "nested extern declaration of %qD", x);
 
       while (b && !B_IN_EXTERNAL_SCOPE (b))
 	{

gcc/testsuite/ChangeLog

@@ -5,6 +5,9 @@
 	* gcc.dg/pr67784-4.c: New test.
 	* gcc.dg/pr67784-5.c: New test.
 
+	PR c/70791
+	* gcc.dg/Wnested-externs-2.c: New test.
+
 2016-04-26  Marc Glisse  <marc.glisse@inria.fr>
 
 	* gcc.dg/fold-plusmult.c: Adjust.

gcc/testsuite/gcc.dg/Wnested-externs-2.c

+/* PR c/70791 */
+/* { dg-do compile } */
+/* { dg-options "-Wnested-externs" } */
+
+void
+bar (void)
+{
+  extern int i; /* { dg-warning "14:nested extern declaration of 'i'" } */
+  extern short foo (void); /* { dg-warning "16:nested extern declaration of 'foo'" } */
+  extern struct S *s; /* { dg-warning "20:nested extern declaration of 's'" } */
+}