[Bug bootstrap/49383] [4.7 regression] powerpc64-linux bootstrap failure due to ice in cgraph_only_called_directly_p

[amodra at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49383

Alan Modra <amodra at gmail dot com> changed:

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                 CC|                            |amodra at gmail dot com

--- Comment #4 from Alan Modra <amodra at gmail dot com> 2011-06-19 23:18:08 UTC ---
Honza, the code here is called during expansion of functions.  If called at the
start of a function body, the function is attempting to answer the question:
Can this function be called from anywhere external to this object file?
If called for the expansion of a call then the question is:
Can this function call go to a function external to this object file?
Then, once those questions are answered, further code checks whether function
arguments and return value might be affected by the ABI in force.

We aren't at all interested in local functions, so I don't think c_node->local
and c_node->can_change_signature are relevant.  At least, I don't see that they
give any more information than cgraph_only_called_directly_p relevant to the
questions call_ABI_of_interest is trying to answer.