re PR c++/63588 (ICE (segfault) on arm-linux-gnueabihf)

	PR c++/63588
	* pt.c (uses_template_parms): Handle null argument.

From-SVN: r217948

gcc/cp/ChangeLog

+2014-11-21  Jason Merrill  <jason@redhat.com>
+
+	PR c++/63588
+	* pt.c (uses_template_parms): Handle null argument.
+
 2014-11-21  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/63764

gcc/cp/pt.c

@@ -8294,6 +8294,9 @@ for_each_template_parm (tree t, tree_fn_t fn, void* data,
 int
 uses_template_parms (tree t)
 {
+  if (t == NULL_TREE)
+    return false;
+
   bool dependent_p;
   int saved_processing_template_decl;
 

gcc/testsuite/g++.dg/cpp1y/var-templ15.C

+// PR c++/63588
+// { dg-do compile { target c++14 } }
+
+template <class T> T elements;
+int i = elements <>;		// { dg-error "arguments" }