PR c++/70824 - initializer_list in template

* init.c (constant_value_1): Don't instantiated DECL_INITIAL of
	artificial variables.

From-SVN: r238386

gcc/cp/ChangeLog

@@ -1,3 +1,9 @@
+2016-07-15  Jason Merrill  <jason@redhat.com>
+
+	PR c++/70824
+	* init.c (constant_value_1): Don't instantiated DECL_INITIAL of
+	artificial variables.
+
 2016-07-15  Cesar Philippidis  <cesar@codesourcery.com>
 
 	* parser.c (cp_parser_oacc_declare): Don't scan for

gcc/cp/init.c

@@ -2073,8 +2073,13 @@ constant_value_1 (tree decl, bool strict_p, bool return_aggregate_cst_ok_p)
 	  && TREE_CODE (init) == TREE_LIST
 	  && TREE_CHAIN (init) == NULL_TREE)
 	init = TREE_VALUE (init);
-      /* Instantiate a non-dependent initializer.  */
-      init = instantiate_non_dependent_or_null (init);
+      /* Instantiate a non-dependent initializer for user variables.  We
+	 mustn't do this for the temporary for an array compound literal;
+	 trying to instatiate the initializer will keep creating new
+	 temporaries until we crash.  Probably it's not useful to do it for
+	 other artificial variables, either.  */
+      if (!DECL_ARTIFICIAL (decl))
+	init = instantiate_non_dependent_or_null (init);
       if (!init
 	  || !TREE_TYPE (init)
 	  || !TREE_CONSTANT (init)

gcc/testsuite/g++.dg/cpp0x/initlist-template1.C

@@ -0,0 +1,15 @@
+// PR c++/70824
+// { dg-do compile { target c++11 } }
+
+#include <initializer_list>
+
+constexpr
+int
+max(std::initializer_list<int> __l)
+{ return *__l.begin(); }
+
+template <class Src>
+void
+a() {
+  const int v =  max({1});
+}