Fix 20020425-1.c

[Mike Stump]

This fixes 20020425-1.c when the compiler under test is built with -O0 and 
we're on a machine with an 8 meg stack.

Ok?

2011-04-12  Mike Stump  <mikest...@comcast.net>

        * c-typeck.c (c_finish_if_stmt): Fold result.
        * fold-const.c (fold_ternary_loc): Handle an empty else.


This fixes 20020425-1.c so that it doesn't fail when the compiler is built with 
-O0. 

2011-04-12  Mike Stump  <mikest...@comcast.net>

        * c-typeck.c (c_finish_if_stmt): Fold result.
        * fold-const.c (fold_ternary_loc): Handle an empty else.

Index: fold-const.c
===================================================================
--- fold-const.c        (revision 1279)
+++ fold-const.c        (working copy)
@@ -13260,6 +13260,8 @@
       return NULL_TREE;
 
     case COND_EXPR:
+      if (!op2)
+       return NULL_TREE;
       /* Pedantic ANSI C says that a conditional expression is never an lvalue,
         so all simple results must be passed through pedantic_non_lvalue.  */
       if (TREE_CODE (arg0) == INTEGER_CST)
Index: c-typeck.c
===================================================================
--- c-typeck.c  (revision 1279)
+++ c-typeck.c  (working copy)
@@ -8916,8 +8916,7 @@
                     "suggest explicit braces to avoid ambiguous %<else%>");
     }
 
-  stmt = build3 (COND_EXPR, void_type_node, cond, then_block, else_block);
-  SET_EXPR_LOCATION (stmt, if_locus);
+  stmt = fold_build3_loc (if_locus, COND_EXPR, void_type_node, cond, 
then_block, else_block);
   add_stmt (stmt);
 }