--disable-checking bootstrap failure

[Nathan Sidwell <nathan at codesourcery dot com>]

I have tracked the --disable-checking bootstrap failure to the assertification
of tree-cfg.c.  However, the bug is not a misapplied assert, or
an assert with sideeffects. It must reside elsewhere.

I attach a patch which reinserts the check with an abort, but this is
obviously papering over the problem.


I've attached a preprocessed tree-cfg.i file, with this patch applied
(line 24410).  Removing that line causes miscompilation of the file
on (at least) i686-pc-linux-gnu, with '-O2 -g'.

It's getting to the end of the day here, and I'm going to have another
learning curve figuring out where to look next.  anyone want to help?

nathan
--
Nathan Sidwell    ::   http://www.codesourcery.com   ::     CodeSourcery LLC
nathan@codesourcery.com    ::     http://www.planetfall.pwp.blueyonder.co.uk

Index: tree-cfg.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/tree-cfg.c,v
retrieving revision 2.49
diff -c -3 -p -r2.49 tree-cfg.c
*** tree-cfg.c	10 Sep 2004 08:58:46 -0000	2.49
--- tree-cfg.c	10 Sep 2004 15:41:03 -0000
*************** tree_find_edge_insert_loc (edge e, block
*** 2894,2899 ****
--- 2894,2900 ----
  	  if (!is_gimple_val (op))
  	    {
  	      gcc_assert (TREE_CODE (op) == MODIFY_EXPR);
+ 	      if (TREE_CODE (op) != MODIFY_EXPR) abort ();
  	      bsi_insert_before (bsi, op, BSI_NEW_STMT);
  	      TREE_OPERAND (tmp, 0) = TREE_OPERAND (op, 0);
  	    }

Attachment: tree-cfg.i.gz
Description: application/gunzip