[Bug bootstrap/60830] [4.9 Regression] ICE on bootstrapping on cygwin

["bernd.edlinger at hotmail dot de" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60830

--- Comment #27 from Bernd Edlinger <bernd.edlinger at hotmail dot de> ---
(In reply to Denis Excoffier from comment #26)
> After more investigation, it seems that the culprit can be
> --disable-sjlj-exceptions. Since the beginning (last Sunday), each time i
> use it on the command line, the build fails and each time i don't use it,
> the build succeeds.
> Please would you mind trying again a cygwin build, but
> with --disable-sjlj-exceptions this time. Especially for those where the
> build succeeded. For Mikael (see comment #2), it is more than probable that
> he used --disable-sjlj-exceptions instead of my gmp kludges known by nobody
> except by me.

Yes, adding --disable-sjlj-exceptions makes the build fail:

mkdir -p -- i686-pc-cygwin/libgcc
Checking multilib configuration for libgcc...
Configuring stage 2 in i686-pc-cygwin/libgcc
configure: creating cache ./config.cache
checking build system type... i686-pc-cygwin
checking host system type... i686-pc-cygwin
checking for --enable-version-specific-runtime-libs... no
checking for a BSD-compatible install... /usr/bin/install -c
checking for gawk... gawk
xgcc: error: unrecognized command line option '-isystem'
xgcc: error: unrecognized command line option '-isystem'
xgcc: error: unrecognized command line option '-mtune=generic'
xgcc: error: unrecognized command line option '-march=pentiumpro'
checking for i686-pc-cygwin-ar... ar
checking for i686-pc-cygwin-lipo... lipo
checking for i686-pc-cygwin-nm... /home/ED/gnu/gcc-build/./gcc/nm
checking for i686-pc-cygwin-ranlib... ranlib
checking for i686-pc-cygwin-strip... strip
checking whether ln -s works... yes
checking for i686-pc-cygwin-gcc... /home/ED/gnu/gcc-build/./gcc/xgcc
-B/home/ED/gnu/gcc-build/./gcc/ -B/home/ed/gnu/install/i686-pc-cygwin/bin/
-B/home/ed/gnu/install/i686-pc-cygwin/lib/ -isystem
/home/ed/gnu/install/i686-pc-cygwin/include -isystem
/home/ed/gnu/install/i686-pc-cygwin/sys-include
checking for C compiler default output file name...
configure: error: in `/home/ED/gnu/gcc-build/i686-pc-cygwin/libgcc':
configure: error: C compiler cannot create executables
See `config.log' for more details.
Makefile:17788: recipe for target 'configure-stage2-target-libgcc' failed
make[2]: *** [configure-stage2-target-libgcc] Error 77
make[2]: Leaving directory '/home/ED/gnu/gcc-build'
Makefile:20606: recipe for target 'stage2-bubble' failed
make[1]: *** [stage2-bubble] Error 2
make[1]: Leaving directory '/home/ED/gnu/gcc-build'
Makefile:897: recipe for target 'all' failed
make: *** [all] Error 2