[clang] OpenOffice does not work with clang-compiled libgcc_s.so.1

Hello list!

I have decided that clang in mature enough to give it a try on a main
desktop. Everything is working fine except OpenOffice. The problem was
already reported [1] and even analyzed [2]. Although the OP has reported [3]
that since r218915 he has no problems anymore, I still have :(
Note, that according to [4] it seems it was not specifically fixed upstream.

So, if I compile the whole world (and kernel) with clang, soffice.bin
dumps core. If I recompile the world with gcc and replace /lib/libgcc_s.so.1
with the new one, OpenOffice works fine again. Here are some information
about the system that may be useful:

~> uname -a
FreeBSD lexx.ifp.tuwien.ac.at 9.0-BETA1 FreeBSD 9.0-BETA1 #0 r224414: Tue Jul 26 16:00:43 CEST 2011     [e-mail]:/usr/obj/usr/src/sys/GENERIC  amd64

~> gcc --version
gcc (GCC) 4.2.2 20070831 prerelease [FreeBSD]
Copyright (C) 2007 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

~> clang --version
FreeBSD clang version 3.0 (trunk 135360) 20110717
Target: x86_64-unknown-freebsd9.0
Thread model: posix

~> cat /etc/make.conf
SUP_UPDATE=	YES
PORTSSUPFILE=	/root/ports-supfile
DOCSUPFILE=	/root/doc-supfile
DOC_LANG=	en_US.ISO8859-1

..if ${.CURDIR:M*/usr/ports*}
..include "/etc/ports.conf"
..endif

# Building base with clang
..if ${.CURDIR:M*/usr/src*}
..if !defined(CC) || ${CC} == "cc"
CC=		clang
..endif
..if !defined(CXX) || ${CXX} == "c++"
CXX=		clang++
..endif
..if !defined(CPP) || ${CPP} == "cpp"
CPP=		clang -E
..endif
# Don't die on warnings
NO_WERROR=
WERROR=
..endif
# added by use.perl 2011-07-18 17:50:51
PERL_VERSION=5.14.1

I don't have much time recently, so any further debugging will be on a
"best effort" basis. Anyway I thought it is better to post it here, so
it won't be just lost. If necessary I can file a PR about it.

Thanks,
Alexey.

[1] http://lists.freebsd.org/pipermail/freebsd-current/2010-October/020668.html
[2] http://lists.freebsd.org/pipermail/freebsd-current/2010-November/020838.html
[3] http://lists.freebsd.org/pipermail/freebsd-current/2011-February/023003.html
[4] http://llvm.org/bugs/show_bug.cgi?id=8541
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