Failure to bootstrap trunk with --enable-threads=posix on cygwin since r180767

[Christian Joensson <christian dot joensson at gmail dot com>]

On cygwin, I get the following failure when trying to boostrap current
Fri Nov  4 19:36:52 UTC 2011 (revision 180977) gcc trunk:

/bin/sh ../../../gcc/libgcc/../mkinstalldirs .
ln -s -f libgcc.map libgcc.map.def && if [ ! -d ./shlib ]; then mkdir
./shlib; else true; fi && /usr/local/src/objdir/./gcc/xgcc
-B/usr/local/src/objdir/./gcc/ -B/usr/i686-pc-cygwin/bin/
-B/usr/i686-pc-cygwin/lib/ -isystem /usr/i686-pc-cygwin/include
-isystem /usr/i686-pc-cygwin/sys-include    -O2
-I../../../gcc/libgcc/../winsup/w32api/include
-I../../../gcc/libgcc/../winsup/include
-I../../../gcc/libgcc/../winsup/cygwin/include -g -O2 -DIN_GCC   -W
-Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -Wstrict-prototypes
-Wmissing-prototypes -Wold-style-definition  -isystem ./include   -g
-DIN_LIBGCC2 -fbuilding-libgcc -fno-stack-protector  -pthread -shared
-nodefaultlibs libgcc.map.def
-Wl,--out-implib,./shlib/libgcc_s.dll.a.tmp -o
./shlib/cyggcc_s-1.dll.tmp -g -O2 -B./ _chkstk_s.o _chkstk_ms_s.o
_muldi3_s.o _negdi2_s.o _lshrdi3_s.o _ashldi3_s.o _ashrdi3_s.o
_cmpdi2_s.o _ucmpdi2_s.o _clear_cache_s.o _trampoline_s.o __main_s.o
_absvsi2_s.o _absvdi2_s.o _addvsi3_s.o _addvdi3_s.o _subvsi3_s.o
_subvdi3_s.o _mulvsi3_s.o _mulvdi3_s.o _negvsi2_s.o _negvdi2_s.o
_ctors_s.o _ffssi2_s.o _ffsdi2_s.o _clz_s.o _clzsi2_s.o _clzdi2_s.o
_ctzsi2_s.o _ctzdi2_s.o _popcount_tab_s.o _popcountsi2_s.o
_popcountdi2_s.o _paritysi2_s.o _paritydi2_s.o _powisf2_s.o
_powidf2_s.o _powixf2_s.o _powitf2_s.o _mulsc3_s.o _muldc3_s.o
_mulxc3_s.o _multc3_s.o _divsc3_s.o _divdc3_s.o _divxc3_s.o
_divtc3_s.o _bswapsi2_s.o _bswapdi2_s.o _clrsbsi2_s.o _clrsbdi2_s.o
_fixunssfsi_s.o _fixunsdfsi_s.o _fixunsxfsi_s.o _fixsfdi_s.o
_fixdfdi_s.o _fixxfdi_s.o _fixunssfdi_s.o _fixunsdfdi_s.o
_fixunsxfdi_s.o _floatdisf_s.o _floatdidf_s.o _floatdixf_s.o
_floatundisf_s.o _floatundidf_s.o _floatundixf_s.o _divdi3_s.o
_moddi3_s.o _udivdi3_s.o _umoddi3_s.o _udiv_w_sdiv_s.o _udivmoddi4_s.o
tf-signs_s.o addtf3_s.o divtf3_s.o eqtf2_s.o getf2_s.o letf2_s.o
multf3_s.o negtf2_s.o subtf3_s.o unordtf2_s.o fixtfsi_s.o
fixunstfsi_s.o floatsitf_s.o floatunsitf_s.o fixtfdi_s.o
fixunstfdi_s.o floatditf_s.o floatunditf_s.o extendsftf2_s.o
extenddftf2_s.o extendxftf2_s.o trunctfsf2_s.o trunctfdf2_s.o
trunctfxf2_s.o enable-execute-stack_s.o unwind-dw2_s.o
unwind-dw2-fde_s.o unwind-sjlj_s.o unwind-c_s.o emutls_s.o
-Wl,-lpthread -lcygwin -ladvapi32 -lshell32 -luser32 -lkernel32 && if
[ -f ./shlib/cyggcc_s-1.dll ]; then mv -f ./shlib/cyggcc_s-1.dll
./shlib/cyggcc_s-1.dll.backup; else true; fi && mv
./shlib/cyggcc_s-1.dll.tmp ./shlib/cyggcc_s-1.dll && mv
./shlib/libgcc_s.dll.a.tmp ./shlib/libgcc_s.dll.a
xgcc: error: unrecognized command line option ÃâË-pthreadÃââ
make[3]: *** [libgcc_s.dll] Error 1
make[3]: Leaving directory `/usr/local/src/objdir/i686-pc-cygwin/libgcc'
make[2]: *** [all-stage1-target-libgcc] Error 2
make[2]: Leaving directory `/usr/local/src/objdir'
make[1]: *** [stage1-bubble] Error 2
make[1]: Leaving directory `/usr/local/src/objdir'
make: *** [all] Error 2

This is with gcc configured as

Using built-in specs.
COLLECT_GCC=./gcc/xgcc
Target: i686-pc-cygwin
Configured with: ../gcc/configure --prefix=/usr --exec-prefix=/usr
--bindir=/usrfdir=/etc --datarootdir=/usr/share
--docdir=/usr/share/doc/gcc4 -C --datadir=/usnable-bootstrap
--enable-version-specific-runtime-libs --libexecdir=/usr/lib --enu-as
--with-dwarf2 --disable-sjlj-exceptions
--enable-languages=c,c++,fortran,jble-libjava --program-suffix=-4
--enable-libgomp --enable-libssp --enable-threadRGET=gcc-4
CXX_FOR_TARGET=g++-4
Thread model: posix
gcc version 4.7.0 20111104 (experimental) [trunk revision 180977] (GCC)

Note the --enable-threads=posix.

Backing off to revision 180766 does not yield this problem, while
180767 has the problem.

-- 
Cheers,

/ChJ