[PATCH] Fix PR48073

[Richard Guenther]

This fixes PR48073 - we are not interested in types on IDENTIFIER_NODEs
for LTO and thus we don't need to walk types or decls that hang off
such types.

Bootstrapped and tested on x86_64-unknown-linux-gnu, applied to trunk.

Richard.

2011-03-11  Richard Guenther  <rguent...@suse.de>

        PR lto/48073
        * tree.c (find_decls_types_r): Do not walk types only reachable
        from IDENTIFIER_NODEs.

        * g++.dg/lto/20110311-1_0.C: New testcase.

Index: gcc/tree.c
===================================================================
--- gcc/tree.c  (revision 170868)
+++ gcc/tree.c  (working copy)
@@ -4822,7 +4822,8 @@ find_decls_types_r (tree *tp, int *ws, v
       fld_worklist_push (BLOCK_ABSTRACT_ORIGIN (t), fld);
     }
 
-  fld_worklist_push (TREE_TYPE (t), fld);
+  if (TREE_CODE (t) != IDENTIFIER_NODE)
+    fld_worklist_push (TREE_TYPE (t), fld);
 
   return NULL_TREE;
 }
Index: gcc/testsuite/g++.dg/lto/20110311-1_0.C
===================================================================
--- gcc/testsuite/g++.dg/lto/20110311-1_0.C     (revision 0)
+++ gcc/testsuite/g++.dg/lto/20110311-1_0.C     (revision 0)
@@ -0,0 +1,51 @@
+/* { dg-lto-do link } */
+/* { dg-extra-ld-options "-r -nostdlib" } */
+
+struct NullType {};
+
+template <class T, class U>
+struct TList
+{
+    typedef T Head;
+    typedef U Tail;
+};
+
+template <class T>
+struct TListLength {};
+
+template <class T, class U>
+struct TListLength<TList<T,U> >
+{
+    enum
+    {
+        Ret = 1 + TListLength<U>::Ret
+    };
+};
+
+template <>
+struct TListLength<NullType>
+{
+    enum
+    {
+        Ret = 0
+    };
+};
+
+template <class Moves>
+class DDQMC
+{
+public:
+    int* moves[TListLength<Moves>::Ret];
+    inline DDQMC();
+private:
+};
+
+template <class Moves>
+DDQMC<Moves>::DDQMC()
+{
+}
+
+int main()
+{
+    typedef DDQMC< TList<float, TList<int, NullType> > > mytype;
+}