re PR c++/84350 (ICE with new and auto)

/cp
2018-02-14  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/84350
	* pt.c (do_auto_deduction): Don't check the TREE_TYPE of a null
	init, early return.

/testsuite
2018-02-14  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/84350
	* g++.dg/cpp0x/auto49.C: New.

From-SVN: r257666

gcc/cp/ChangeLog

+2018-02-14  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/84350
+	* pt.c (do_auto_deduction): Don't check the TREE_TYPE of a null
+	init, early return.
+
 2018-02-14  Nathan Sidwell  <nathan@acm.org>
 
 	* decl2.c (mark_vtable_entries): Set input_location to decl's.

gcc/cp/pt.c

@@ -25975,7 +25975,7 @@ do_auto_deduction (tree type, tree init, tree auto_node,
     /* C++17 class template argument deduction.  */
     return do_class_deduction (type, tmpl, init, flags, complain);
 
-  if (TREE_TYPE (init) == NULL_TREE)
+  if (init == NULL_TREE || TREE_TYPE (init) == NULL_TREE)
     /* Nothing we can do with this, even in deduction context.  */
     return type;
 

gcc/testsuite/ChangeLog

+2018-02-14  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/84350
+	* g++.dg/cpp0x/auto49.C: New.
+
 2018-02-14  Nathan Sidwell  <nathan@acm.org>
 
 	* g++.dg/template/instantiate5.C: Adjust required-from loc.

gcc/testsuite/g++.dg/cpp0x/auto49.C

+// PR c++/84350
+// { dg-do compile { target c++11 } }
+
+template<typename... T> void foo(T... t)
+{
+  new auto(t...);  // { dg-error "invalid use" }
+}
+
+void bar()
+{
+  foo();
+}