Re: CURRENT (r249438): (devel/libiconv)./unistd.h:686:5: error:

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On 2013-04-17 06:07:47 -0400, Dimitry Andric wrote:
> On Apr 17, 2013, at 07:31, Jan Beich <jbeich@tormail.org> wrote:
>> Dimitry Andric <dim@FreeBSD.org> writes: On Apr 16, 2013, at
>> 00:42, Jan Beich <jbeich@tormail.org> wrote:
> ...
>>>> Maybe -O3 overoptimizes regex in libc e.g.,
>>>> 
>>>> $ echo '#if @GNULIB_EUIDACCESS@' | sed
>>>> 's/@GNULIB_EUIDACCESS@/0/' #if @GNULIB_EUIDACCESS@
>>>> 
>>>> $ echo 'aaaaaaaaaaaaaaaaxxxaaaa' | sed
>>>> 's/aaaaaaaaaaaaxxxaaaa//' aaaaaaaaaaaaaaaaxxxaaaa
>>> 
>>> How did you arrive at this result?
>> 
>> 1/ chroot into poudriere jail for /head amd64 2/ echo CFLAGS+=-O3
>> >> /etc/make.conf 3/ make -j2 (in /usr/src/lib/libc) 4/ prepend
>> LD_LIBRARY_PATH=. before sed(1) 5/ rebuild regcomp.o, regcomp.So
>> with -O2 to confirm
> 
> I have been able to reproduce this on amd64, with -O3, but not on
> i386. It seems regcomp() is either miscompiled at -O3, or it
> contains some bug triggered only by the vectorizer.  I am still
> investigating.
....

With "-fno-vectorize", this problem doesn't seem to happen.

FYI,

Jung-uk Kim
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