re PR c++/70543 (wrong non-const error for enable_if and constexpr function)

	PR c++/70543

	* pt.c (value_dependent_expression_p) [VAR_DECL]: A type-dependent
	initializer also makes the variable value-dependent.

From-SVN: r234990

gcc/cp/ChangeLog

 2016-04-14  Jason Merrill  <jason@redhat.com>
 
+	PR c++/70543
+	* pt.c (value_dependent_expression_p) [VAR_DECL]: A type-dependent
+	initializer also makes the variable value-dependent.
+
 	PR c++/70648
 	* constexpr.c (cxx_eval_store_expression): Also copy
 	CONSTRUCTOR_NO_IMPLICIT_ZERO.

gcc/cp/pt.c

@@ -22670,6 +22670,7 @@ value_dependent_expression_p (tree expression)
 	  && (TREE_CODE (DECL_INITIAL (expression)) == TREE_LIST
 	      /* cp_finish_decl doesn't fold reference initializers.  */
 	      || TREE_CODE (TREE_TYPE (expression)) == REFERENCE_TYPE
+	      || type_dependent_expression_p (DECL_INITIAL (expression))
 	      || value_dependent_expression_p (DECL_INITIAL (expression))))
 	return true;
       return false;

gcc/testsuite/g++.dg/cpp0x/constexpr-template9.C

+// PR c++/70543
+// { dg-do compile { target c++11 } }
+
+template <typename>
+struct X
+{
+  template <unsigned int = 0>
+  static constexpr int
+  calc (void)
+  {
+    return 0;
+  }
+
+  static constexpr unsigned int value = calc ();
+
+  char foo[value];
+};