Date: Tue, 16 Apr 2013 20:58:49 +0200 From: Dimitry Andric <dim@FreeBSD.org> To: Jan Beich <jbeich@tormail.org> Cc: FreeBSD Current <freebsd-current@freebsd.org>, "O. Hartmann" <ohartman@zedat.fu-berlin.de>, FreeBSD ports <freebsd-ports@freebsd.org> Subject: Re: CURRENT (r249438): (devel/libiconv)./unistd.h:686:5: error: invalid token at start of a preprocessor expression : #if @GNULIB_EUIDACCESS@ Message-ID: <E15F2208-0A57-4C40-B7B0-FEA7953500AD@FreeBSD.org> In-Reply-To: <1URs5b-000B9U-A2@internal.tormail.org> References: <1365877246.2093.20.camel@thor.walstatt.dyndns.org> <1URs5b-000B9U-A2@internal.tormail.org>
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On Apr 16, 2013, at 00:42, Jan Beich <jbeich@tormail.org> wrote: > "O. Hartmann" <ohartman@zedat.fu-berlin.de> writes: >> ./unistd.h:694:5: error: invalid token at start of a preprocessor >> expression >> #if @GNULIB_EUIDACCESS@ >> ^ >> 1 error generated. > > 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? I have recompiled both libc and sed with -O3, but it works just fine here. Maybe -march=native is the clue, so which kind of CPU do you have? To see what CPU llvm detects, try: tblgen -version | grep CPU Note that -O3 turns on clang's vectorizer, so you might have run into an optimizer bug, or some kind of undefined behavior which now falls over. -Dimitry
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