PR c++/91868 - improve -Wshadow location.

	* name-lookup.c (check_local_shadow): Use DECL_SOURCE_LOCATION
	instead of input_location.

	* g++.dg/warn/Wshadow-16.C: New test.

From-SVN: r276103

gcc/cp/ChangeLog

 2019-09-24  Marek Polacek  <polacek@redhat.com>
 
+	PR c++/91868 - improve -Wshadow location.
+	* name-lookup.c (check_local_shadow): Use DECL_SOURCE_LOCATION
+	instead of input_location.
+
 	PR c++/91845 - ICE with invalid pointer-to-member.
 	* expr.c (mark_use): Use error_operand_p.
 	* typeck2.c (build_m_component_ref): Check error_operand_p after

gcc/cp/name-lookup.c

@@ -2771,7 +2771,7 @@ check_local_shadow (tree decl)
 	msg = "declaration of %qD shadows a previous local";
 
       auto_diagnostic_group d;
-      if (warning_at (input_location, warning_code, msg, decl))
+      if (warning_at (DECL_SOURCE_LOCATION (decl), warning_code, msg, decl))
 	inform_shadowed (old);
       return;
     }
@@ -2798,7 +2798,7 @@ check_local_shadow (tree decl)
 	    || TYPE_PTRMEMFUNC_P (TREE_TYPE (decl)))
 	  {
 	    auto_diagnostic_group d;
-	    if (warning_at (input_location, OPT_Wshadow,
+	    if (warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wshadow,
 			    "declaration of %qD shadows a member of %qT",
 			    decl, current_nonlambda_class_type ())
 		&& DECL_P (member))
@@ -2818,7 +2818,7 @@ check_local_shadow (tree decl)
     /* XXX shadow warnings in outer-more namespaces */
     {
       auto_diagnostic_group d;
-      if (warning_at (input_location, OPT_Wshadow,
+      if (warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wshadow,
 		      "declaration of %qD shadows a global declaration",
 		      decl))
 	inform_shadowed (old);

gcc/testsuite/ChangeLog

 2019-09-24  Marek Polacek  <polacek@redhat.com>
 
+	PR c++/91868 - improve -Wshadow location.
+	* g++.dg/warn/Wshadow-16.C: New test.
+
 	PR c++/91845 - ICE with invalid pointer-to-member.
 	* g++.dg/cpp1y/pr91845.C: New test.
 

gcc/testsuite/g++.dg/warn/Wshadow-16.C

+// PR c++/91868 - improve -Wshadow location.
+// { dg-options "-Wshadow" }
+
+int global; // { dg-message "shadowed declaration" }
+
+struct S
+{
+  static int bar; // { dg-message "shadowed declaration" }
+  S (int i) { int bar // { dg-warning "19:declaration of .bar. shadows a member" }
+      (1);
+    int global // { dg-warning "9:declaration of .global. shadows a global declaration" }
+      (42);
+  }
+};
+
+void
+foo ()
+{
+  int xx; // { dg-message "shadowed declaration" }
+  {
+    S xx // { dg-warning "7:declaration of .xx. shadows a previous local" }
+    (42);
+  }
+}