Re: circular reference chains with DW_AT_containing_type

[Roland McGrath <roland at redhat dot com>]

It certainly merits investigation on the GCC side to see if this data is
coming out as it ought to.  Butk, we have to cope with the data as it
exists, even bad old data from buggy old compilers.

So far the only violation of our assumption for the algorithm design is
this case of direct self-reference.  That is far simpler to handle than the
general case of circular chains of references.  For hashing purposes, we
can treat a direct self reference as hashing to zero.  If we come across
cases of indirect circularity in the data, then we'll have to reconsider
more fully.  But this alone doesn't seem like it fouls our plans.


Thanks,
Roland