Fix PR c++/69091 (ICE with operator overload having 'auto' return type)

gcc/cp/ChangeLog:

	PR c++/69091
	* pt.c (type_dependent_expression_p): For a function template
	specialization, a type is dependent iff any of its template
	arguments are.

gcc/testsuite/ChangeLog:

	PR c++/69091
	* g++.dg/template/pr69091.C: New test.

From-SVN: r232463

gcc/cp/ChangeLog

 2016-01-16  Patrick Palka  <ppalka@gcc.gnu.org>
 
+	PR c++/69091
+	* pt.c (type_dependent_expression_p): For a function template
+	specialization, a type is dependent iff any of its template
+	arguments are.
+
+2016-01-16  Patrick Palka  <ppalka@gcc.gnu.org>
+
 	* cp-array-notation.c (cp_expand_cond_array_notations): Return
 	error_mark_node only if find_rank failed, not if it was
 	successful.

gcc/cp/pt.c

@@ -22759,12 +22759,12 @@ type_dependent_expression_p (tree expression)
 	      || dependent_scope_p (scope));
     }
 
+  /* A function template specialization is type-dependent if it has any
+     dependent template arguments.  */
   if (TREE_CODE (expression) == FUNCTION_DECL
       && DECL_LANG_SPECIFIC (expression)
-      && DECL_TEMPLATE_INFO (expression)
-      && (any_dependent_template_arguments_p
-	  (INNERMOST_TEMPLATE_ARGS (DECL_TI_ARGS (expression)))))
-    return true;
+      && DECL_TEMPLATE_INFO (expression))
+    return any_dependent_template_arguments_p (DECL_TI_ARGS (expression));
 
   if (TREE_CODE (expression) == TEMPLATE_DECL
       && !DECL_TEMPLATE_TEMPLATE_PARM_P (expression))

gcc/testsuite/ChangeLog

 2016-01-16  Patrick Palka  <ppalka@gcc.gnu.org>
 
+	PR c++/69091
+	* g++.dg/template/pr69091.C: New test.
+
+2016-01-16  Patrick Palka  <ppalka@gcc.gnu.org>
+
 	* c-c++-common/cilk-plus/AN/an-if.c: Check that the original
 	dump does not contain an error_mark_node.
 	* c-c++-common/cilk-plus/CK/pr60469.c: Likewise.

gcc/testsuite/g++.dg/template/pr69091.C

+// PR c++/69091
+// { dg-do compile { target c++14 } }
+
+template <class ValueType, ValueType>
+struct Option {};
+
+template <class ValueType, ValueType Value, class OptionsRhs>
+auto operator|(Option<ValueType, Value>, OptionsRhs) {
+  return Value;
+}
+
+enum canine_t { no, yes };
+Option<canine_t, no> cat;
+Option<canine_t, yes> dog;
+
+template <class T>
+void f(T) {
+  cat | dog;
+}
+
+struct A {};
+int main() {
+  f(A{});
+  return 0;
+}