re PR c++/65202 (ICE segfault with constexpr/noexcept)

	PR c++/65202
	* constexpr.c (cxx_eval_constant_expression): Don't evaluate
	a RETURN_EXPR if its operand is null.

	* g++.dg/cpp1y/pr65202.C: New test.

From-SVN: r221015

gcc/cp/ChangeLog

+2015-02-26  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/65202
+	* constexpr.c (cxx_eval_constant_expression): Don't evaluate
+	a RETURN_EXPR if its operand is null.
+
 2015-02-25  Jason Merrill  <jason@redhat.com>
 
 	PR c++/65209

gcc/cp/constexpr.c

@@ -3113,9 +3113,10 @@ cxx_eval_constant_expression (const constexpr_ctx *ctx, tree t,
       break;
 
     case RETURN_EXPR:
-      r = cxx_eval_constant_expression (ctx, TREE_OPERAND (t, 0),
-					lval,
-					non_constant_p, overflow_p);
+      if (TREE_OPERAND (t, 0) != NULL_TREE)
+	r = cxx_eval_constant_expression (ctx, TREE_OPERAND (t, 0),
+					  lval,
+					  non_constant_p, overflow_p);
       *jump_target = t;
       break;
 

gcc/testsuite/ChangeLog

+2015-02-26  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/65202
+	* g++.dg/cpp1y/pr65202.C: New test.
+
 2015-02-26  Tom de Vries  <tom@codesourcery.com>
 
 	* g++.dg/gcov/gcov-14.C: Add cleanup of iostream.gcov, ostream.gcov and

gcc/testsuite/g++.dg/cpp1y/pr65202.C

+// // PR c++/65202
+// { dg-do compile { target c++14 } }
+
+template <typename T> struct is_move_constructible;
+template <typename T> struct is_move_assignable;
+template <int, typename T> using enable_if_t = int;
+namespace adl {
+template <
+    typename L, typename R,
+    enable_if_t<is_move_constructible<L>() && is_move_assignable<L>(), int>...>
+constexpr auto adl_swap(L &l, R &r) -> decltype(swap(l, r)) {
+  return;
+}
+template <typename L, typename R>
+auto swap(L &l, R &r) noexcept(noexcept(adl::adl_swap(l, r)))
+    -> decltype(adl::adl_swap(l, r));
+namespace ns {
+template <typename T> struct foo {};
+template <typename T> void swap(foo<T> &, foo<T> &);
+struct bar;
+
+int main()
+{
+    foo<ns::bar> f;
+    adl::swap(f, f)
+} // { dg-error "" }