[Bug tree-optimization/49772] [4.7 Regression] ICE: in ipa_pta_execute, at tree-ssa-structalias.c:6790 with -fipa-pta

["rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49772

--- Comment #12 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-12-08 11:39:21 UTC ---
It's a complete mystery to me how this cgraph node cloning and edge code
works.  We create the inline clone for a completely different edge
(that _is_ decided to be inlined) than the one we later fail on
(that one is _not_ marked inline and does _not_ have an inline clone callee).

Thus, we shouldn't arrive at this situation at all.  Instead we seem to fail
to inline a call that we should inline (and decided to inline) because of:

/* Expand calls to inline functions in the body of FN.  */

unsigned int
optimize_inline_calls (tree fn)
{
...
  /* There is no point in performing inlining if errors have already
     occurred -- and we might crash if we try to inline invalid
     code.  */
  if (seen_error ())
    return 0;

which leaves us with such state.

So this is yet another case of overeager fail to complete our task.
I suppose we can remove that late fail now that we bail out way earlier
at proper IPA "scope".

The ICE is fixed with removing the above out.