[PATCH] fix for pr 57474

[Iyer, Balaji V]

Hello Everyone,
        PR reports that sec_implicit2 and sec_implicit regression tests were 
failing in darwin. I looked into it and it is due to an uninitialized variable 
(rhs_length). This patch pasted below should fix that issue. Is this OK for 
trunk?

Here are the ChangeLog entries:

2013-05-31  Balaji V. Iyer  <balaji.v.i...@intel.com>
        PR c/57474
        * c-array-notation.c (build_array_notation_expr): Initialized rhs_length
        array to NULL_TREE if they are unused.  Also added a check for the
        field to be NULL before its fields are used in future.


Here is the patch:


diff --git gcc/c/c-array-notation.c gcc/c/c-array-notation.c
index 5376e6b..7fbd573 100644
--- gcc/c/c-array-notation.c
+++ gcc/c/c-array-notation.c
@@ -1547,7 +1547,10 @@ build_array_notation_expr (location_t location, tree 
lhs, tr
        }
       else
        for (jj = 0; jj < rhs_rank; jj++)
-         rhs_vector[ii][jj] = false;
+         {
+           rhs_vector[ii][jj] = false;
+           rhs_length[ii][jj] = NULL_TREE;
+         }
     }

   if (length_mismatch_in_expr_p (EXPR_LOCATION (lhs), lhs_length,
@@ -1561,6 +1564,7 @@ build_array_notation_expr (location_t location, tree lhs, 
tre

   if (lhs_list_size > 0 && rhs_list_size > 0 && lhs_rank > 0 && rhs_rank > 0
       && TREE_CODE (lhs_length[0][0]) == INTEGER_CST
+      && rhs_length[0][0]
       && TREE_CODE (rhs_length[0][0]) == INTEGER_CST)
     {
       HOST_WIDE_INT l_length = int_cst_value (lhs_length[0][0]);  


Thanks,

Balaji V. Iyer.