[C++ PATCH] Don't ICE on auto decl with no initializer (PR c++/37965)

[Jakub Jelinek]

Hi!

If processing_template_decl, start_decl_1 isn't called and thus
nothing reports an error for auto typed variable with no initializer.
Fixed thusly, tested with check-g++ RUNTESTFLAGS=cpp0x/*.C, full
bootstrap/regtest pending.  Ok for trunk if it succeeds?

2008-10-31  Jakub Jelinek  <jakub@redhat.com>

	PR c++/37965
	* decl.c (cp_finish_decl): Diagnose type_uses_auto type with
	no initializer.

	* g++.dg/cpp0x/auto7.C: New test.

--- gcc/cp/decl.c.jj	2008-10-23 13:21:09.000000000 +0200
+++ gcc/cp/decl.c	2008-10-31 13:19:36.000000000 +0100
@@ -5488,11 +5488,20 @@ cp_finish_decl (tree decl, tree init, bo
     DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
 
   auto_node = type_uses_auto (type);
-  if (auto_node && !type_dependent_expression_p (init))
+  if (auto_node)
     {
-      type = TREE_TYPE (decl) = do_auto_deduction (type, init, auto_node);
-      if (type == error_mark_node)
-	return;
+      if (init == NULL_TREE)
+	{
+	  error ("declaration of %q#D has no initializer", decl);
+	  TREE_TYPE (decl) = error_mark_node;
+	  return;
+	}
+      else if (!type_dependent_expression_p (init))
+	{
+	  type = TREE_TYPE (decl) = do_auto_deduction (type, init, auto_node);
+	  if (type == error_mark_node)
+	    return;
+	}
     }
 
   if (processing_template_decl)
--- gcc/testsuite/g++.dg/cpp0x/auto7.C.jj	2008-10-31 13:42:02.000000000 +0100
+++ gcc/testsuite/g++.dg/cpp0x/auto7.C	2008-10-31 13:45:42.000000000 +0100
@@ -0,0 +1,13 @@
+// PR c++/37965
+// Negative test for auto
+// { dg-options "-std=c++0x" }
+
+auto i = 6;
+auto j;			// { dg-error "has no initializer" }
+
+template<int> struct A
+{
+  static auto k = 7;
+  static auto l;	// { dg-error "has no initializer" }
+  auto m;		// { dg-error "has no initializer" }
+};

	Jakub