Re: [LTO][PATCH] Fix WPA breakage

["Ollie Wild" <aaw at google dot com>]

2008/9/25 Doug Kwan (Ãö®¶¼w) <dougkwan@google.com>
>
> I know what causes the problem.  The inter-procedural constant
> propagation pass generates summary information about indirect calls.
> Currently we do not write out this summary.  It is regenerated in the
> normal LTO run.  When we run WPA, regenerating that information is not
> possible because the function bodies are not present in memory.  So we
> do have that piece of information.  The crash you see is caused by the
> IPA inliner when it tries to copy the indirect-call summary of edges
> and nodes.

What's the easiest way to disable this?  Simply commenting out the
following block:

      /* FIXME lto. Hack. We should use the IPA passes.  There are a number
         of issues with this now. 1. There is no convenient way to do this.
         2. Some passes may depend on properties that requires the function
         bodies to compute.  */
      cgraph_function_flags_ready = true;
      bitmap_obstack_initialize (NULL);
      ipa_register_cgraph_hooks ();

      /* Reset inlining informationi before running IPA inliner.  */
      for (node = cgraph_nodes; node; node = node->next)
        reset_inline_failed (node);

      /* FIXME lto. We should not call this function directly. */
      pass_ipa_inline.pass.execute ();

      verify_cgraph ();
      bitmap_obstack_release (NULL);

triggers another error:

    lto1: internal compiler error: in
cgraph_function_body_availability, at cgraph.c:1384

I'd like to disable this for now, so we can start linking all the
WHOPR bits together without things blowing up.

Ollie