PR c++/84045 - ICE with typedef and noexcept.

	* except.c (build_noexcept_spec): Use strip_typedefs_expr.

From-SVN: r257713

gcc/cp/ChangeLog

 2018-02-15  Jason Merrill  <jason@redhat.com>
 
+	PR c++/84045 - ICE with typedef and noexcept.
+	* except.c (build_noexcept_spec): Use strip_typedefs_expr.
+
 	PR c++/84376 - ICE with omitted template arguments.
 	* pt.c (dguide_name_p): Check for IDENTIFIER_NODE.
 

gcc/cp/except.c

@@ -1217,6 +1217,10 @@ build_noexcept_spec (tree expr, int complain)
     {
       gcc_assert (processing_template_decl
 		  || TREE_CODE (expr) == DEFERRED_NOEXCEPT);
+      if (TREE_CODE (expr) != DEFERRED_NOEXCEPT)
+	/* Avoid problems with a function type built with a dependent typedef
+	   being reused in another scope (c++/84045).  */
+	expr = strip_typedefs_expr (expr);
       return build_tree_list (expr, NULL_TREE);
     }
 }

gcc/testsuite/g++.dg/cpp0x/noexcept32.C

+// PR c++/84045
+// { dg-do compile { target c++11 } }
+
+template <typename T> struct K {
+  static const bool d = true;
+};
+template <typename T, typename> struct B {
+  typedef K<T> D;
+  void foo () noexcept (D::d);
+};
+template <typename T> struct P {
+  P () noexcept (K<T>::d);
+};
+P<int> p;