re PR c++/21113 (Jumps into VLA or VM scope not rejected for C++)

	PR c++/21113
	* decl.c (decl_jump_unsafe): Consider variably-modified decls.

From-SVN: r209124

gcc/cp/ChangeLog

+2014-04-04  Patrick Palka  <patrick@parcs.ath.cx>
+
+	PR c++/21113
+	* decl.c (decl_jump_unsafe): Consider variably-modified decls.
+
 2014-04-04  Fabien Chêne  <fabien@gcc.gnu.org>
 
 	* class.c (find_abi_tags_r): Check for the return of warning

gcc/cp/decl.c

@@ -2785,12 +2785,11 @@ decl_jump_unsafe (tree decl)
       || type == error_mark_node)
     return 0;
 
-  type = strip_array_types (type);
-
-  if (DECL_NONTRIVIALLY_INITIALIZED_P (decl))
+  if (DECL_NONTRIVIALLY_INITIALIZED_P (decl)
+      || variably_modified_type_p (type, NULL_TREE))
     return 2;
 
-  if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
+  if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
     return 1;
 
   return 0;

gcc/testsuite/g++.dg/ext/vla14.C

+// PR c++/21113
+// { dg-options "" }
+
+void
+f (int n)
+{
+  goto label; // { dg-error "from here" }
+  int a[n]; // { dg-error "crosses initialization" }
+label: // { dg-error "jump to label" }
+  ;
+}
+
+void
+g (int n)
+{
+  switch (1)
+  {
+  case 1:
+    int (*a)[n]; // { dg-error "crosses initialization" }
+  default: // { dg-error "jump to case label" }
+    ;
+  }
+}