Patch for enable-checking failure egcs-19980715

[grahams@rcp.co.uk]

Hi,

egcs-19980715 fails to bootstrap with enable-checking enabled

This is because safe_from_p() temporarily marks any visited SAVE_EXPR
tree nodes as ERROR_MARK tree nodes to prevent combinational explosion.

Here's a patch which allows egcs-19980715 to complete "make bootstrap"
on x86-linux.

The patch replaces the use of ERROR_MARK tree node to mark a
SAVE_EXPR tree node visited node with a new tree node
SAVE_EXPR_MARKED defined in tree.def


 

Ch
PATCH~1.DIF
angeLog entries

 * gcc/tree.def: Define new tree node SAVE_EXPR_MARKED.

 * gcc/expr.c (safe_from_p): Use new tree node SAVE_EXPR_MARKED
 to mark SAVE_EXPR nodes visited.

With this change It would be possible to eliminate save_expr_rewritten[]   
at the
expense of another tree walk to change any SAVE_EXPR_MARKED
nodes back into SAVE_EXPR nodes.


Graham




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