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Date: Wed, 17 Apr 2013 15:16:23 -0400
From: Jung-uk Kim <jkim@FreeBSD.org>
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To: Dimitry Andric <dim@freebsd.org>
Subject: Re: CURRENT (r249438): (devel/libiconv)./unistd.h:686:5: error:
 invalid
 token at start of a preprocessor expression : #if @GNULIB_EUIDACCESS@
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Cc: FreeBSD Current <freebsd-current@freebsd.org>,
 "O. Hartmann" <ohartman@zedat.fu-berlin.de>,
 FreeBSD ports <freebsd-ports@freebsd.org>, Jan Beich <jbeich@tormail.org>
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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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