[C++/83287] Another overload lookup ice

https://gcc.gnu.org/ml/gcc-patches/2018-01/msg01580.html
	PR c++/83287
	* init.c (build_raw_new_expr): Scan list for lookups to keep.

	PR c++/83287
	* g++.dg/lookup/pr83287-2.C: New.

From-SVN: r256809

gcc/cp/ChangeLog

+2018-01-17  Nathan Sidwell  <nathan@acm.org>
+
+	PR c++/83287
+	* init.c (build_raw_new_expr): Scan list for lookups to keep.
+
 2018-01-17  David Malcolm  <dmalcolm@redhat.com>
 
 	PR c++/83814

gcc/cp/init.c

@@ -2325,7 +2325,12 @@ build_raw_new_expr (vec<tree, va_gc> *placement, tree type, tree nelts,
   else if (init->is_empty ())
     init_list = void_node;
   else
-    init_list = build_tree_list_vec (init);
+    {
+      init_list = build_tree_list_vec (init);
+      for (tree v = init_list; v; v = TREE_CHAIN (v))
+	if (TREE_CODE (TREE_VALUE (v)) == OVERLOAD)
+	  lookup_keep (TREE_VALUE (v), true);
+    }
 
   new_expr = build4 (NEW_EXPR, build_pointer_type (type),
 		     build_tree_list_vec (placement), type, nelts,

gcc/testsuite/ChangeLog

+2018-01-17  Nathan Sidwell  <nathan@acm.org>
+
+	PR c++/83287
+	* g++.dg/lookup/pr83287-2.C: New.
+
 2018-01-17  David Malcolm  <dmalcolm@redhat.com>
 
 	PR c++/83814

gcc/testsuite/g++.dg/lookup/pr83287-2.C

+// PR c++/83287 failed to keep lookup until instantiation time
+
+void foo ();
+
+namespace {
+  void foo ();
+}
+
+template <class T>
+void
+bar ()
+{
+  new T (foo); // { dg-error "cannot resolve" }
+}
+
+void
+baz ()
+{
+  bar <double> ();
+}