[Bug c++/45894] [4.5 Regression] [C++0x] ICE: segmentation fault with -Wall

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45894

--- Comment #12 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-02-02 16:27:46 UTC ---
Although this bug has 4.4.5 in the "Known to work" field, the bug in cp/tree.c
is present on the 4.4 branch, and the testcase in PR 47589 causes an ICE with
4.4.5, without -Wall or -std=c++0x

The fix for cp/tree.c looks safe to backport to 4.4 - any objections to doing
so?

--- gcc/cp/tree.c.jj    2010-11-03 16:58:26.000000000 +0100
+++ gcc/cp/tree.c       2010-11-05 13:45:53.000000000 +0100
@@ -67,7 +67,8 @@ lvalue_kind (const_tree ref)
          == REFERENCE_TYPE)
     return lvalue_kind (TREE_OPERAND (ref, 0));

-  if (TREE_CODE (TREE_TYPE (ref)) == REFERENCE_TYPE)
+  if (TREE_TYPE (ref)
+      && TREE_CODE (TREE_TYPE (ref)) == REFERENCE_TYPE)
     {
       /* unnamed rvalue references are rvalues */
       if (TYPE_REF_IS_RVALUE (TREE_TYPE (ref))