Re: bootstrap compare failure in ada/targparm.o on i686-pc-linux-gnu?

[Alexandre Oliva <aoliva at redhat dot com>]

On Apr  4, 2005, Dale Johannesen <dalej@apple.com> wrote:

> On Apr 4, 2005, at 2:32 PM, Alexandre Oliva wrote:
>> On Mar 26, 2005, Graham Stott <graham.stott@btinternet.com> wrote:
>>> I do regular bootstraps of mainline all languages on FC3
>>> i686-pc-linuux-gnu and haven't seen any problemss upto Friday. I'm
>>> using --enable-checking=tree,misc,rtl,rtlflag which might make a
>>> difference.

>> I'm still observing this problem every now and then.  It's not
>> consistent or easily reproducible, unfortunately.  I suspect we're
>> using pointers somewhere, and that stack/mmap/whatever address
>> randomization is causing different results.  I'm looking into it.

> I've found 2 bugs over the last 6 months where the problem is exposed
> only if two pointers happen to hash to the same bucket.  It's occurred
> to me that doing a bootstrap with all hashtable sizes set to 1 might be
> a good idea.

Perhaps.  But the fundamental problem is that we shouldn't be hashing
on pointers, and tree-eh.c does just that for finally_tree and
throw_stmt_table.

-- 
Alexandre Oliva             http://www.ic.unicamp.br/~oliva/
Red Hat Compiler Engineer   aoliva@{redhat.com, gcc.gnu.org}
Free Software Evangelist  oliva@{lsd.ic.unicamp.br, gnu.org}