re PR c++/51714 (internal compiler error: Segmentation fault with -std=c++11)

	PR c++/51714
	* pt.c (value_dependent_expression_p): Treat STMT_EXPR as
	value-dependent.

From-SVN: r183149

gcc/cp/ChangeLog

+2012-01-12  Jason Merrill  <jason@redhat.com>
+
+	PR c++/51714
+	* pt.c (value_dependent_expression_p): Treat STMT_EXPR as
+	value-dependent.
+
 2012-01-13  Dodji Seketeli  <dodji@redhat.com>
 
 	PR c++/51633

gcc/cp/pt.c

@@ -19526,6 +19526,11 @@ value_dependent_expression_p (tree expression)
 	return false;
       }
 
+    case STMT_EXPR:
+      /* Treat a GNU statement expression as dependent to avoid crashing
+	 under fold_non_dependent_expr; it can't be constant.  */
+      return true;
+
     default:
       /* A constant expression is value-dependent if any subexpression is
 	 value-dependent.  */

gcc/testsuite/ChangeLog

+2012-01-12  Jason Merrill  <jason@redhat.com>
+
+	PR c++/51714
+	* g++.dg/ext/stmtexpr14.C: New.
+
 2012-01-13  Dodji Seketeli  <dodji@redhat.com>
 
 	PR c++/51633

gcc/testsuite/g++.dg/ext/stmtexpr14.C

+// PR c++/51714
+
+template <typename T>
+void Foo()
+{
+  true || !__extension__ ({ int verbose = 2; verbose <= 3; });
+}
+
+int main()
+{
+  Foo<int>();
+}