Gcc [trunk revision 243001] failed to bootstrap on x86_64!

[hjl@gnu-skl-1.localdomain (H.J. Lu)]

cd bld; \
 RUNTESTFLAGS="--target_board='unix{-m32,}'" ../src-trunk/configure \
	 --prefix=/usr/7.0.0 --enable-clocale=gnu --with-system-zlib --enable-shared --with-demangler-in-ld --enable-libmpx --with-build-config='bootstrap-O3 bootstrap-debug' --disable-werror --with-fpmath=sse 
checking build system type... x86_64-pc-linux-gnu
checking host system type... x86_64-pc-linux-gnu
checking target system type... x86_64-pc-linux-gnu
checking for a BSD-compatible install... /bin/install -c
    grep "Error " makelog.243001.trunk.x86_64.O3 >> makelog.243001.trunk.x86_64.O3.mail; \
make[4]: *** [configure-target-libobjc] Error 1
make[3]: *** [bootstrap] Error 2
make[2]: *** [bootstrap] Error 2
no
checking for clock_settime... checking whether byte ordering is bigendian... yes
checking for shm_open in -lrt... no
checking for the word size... yes
checking for dlsym in -ldl... config.status: executing libtool commands
4
yes
checking for clock_gettime in -lrt... config.status: executing depfiles commands
yes
checking for necessary platform features... checking whether the target supports hidden visibility... yes
checking __sync extensions... yes
checking __atomic extensions... yes
checking output filetype... yes
checking whether the target supports dllexport... no
checking whether the target supports symbol aliases... elf32
looking for a compliant stdint.h in stdint.h, checking for uintmax_t... yes
checking whether the target supports the ifunc attribute... yes
checking for uintptr_t... config.status: executing libtool commands
yes
checking for ld used by /export/gnu/import/git/gcc-test/bld/./gcc/xgcc -B/export/gnu/import/git/gcc-test/bld/./gcc/ -B/usr/7.0.0/x86_64-pc-linux-gnu/bin/ -B/usr/7.0.0/x86_64-pc-linux-gnu/lib/ -isystem /usr/7.0.0/x86_64-pc-linux-gnu/include -isystem /usr/7.0.0/x86_64-pc-linux-gnu/sys-include  -m32... (cached) /export/gnu/import/git/gcc-test/bld/./gcc/collect-ld
checking if the linker (/export/gnu/import/git/gcc-test/bld/./gcc/collect-ld) is GNU ld... (cached) yes
yes
checking for int_least32_t... checking for shared libgcc... yes
configure: versioning on shared library symbols is gnu
yes
checking for int_fast32_t... configure: updating cache ./config.cache
configure: creating ./config.status
yes
checking for uint64_t... yes
checking what to include in gstdint.h... stdint.h (already complete)
checking sys/mman.h usability... yes
checking sys/mman.h presence... yes
checking for sys/mman.h... yes
checking alloca.h usability... yes
checking alloca.h presence... yes
checking for alloca.h... yes
checking link.h usability... yes
checking link.h presence... yes
checking for link.h... yes
checking whether strnlen is declared... yes
checking rpc/xdr.h usability... config.status: creating Makefile
yes
checking rpc/xdr.h presence... config.status: creating testsuite/Makefile
config.status: creating auto-config.h
yes
checking for rpc/xdr.h... yes
checking tirpc/rpc/xdr.h usability... config.status: executing default-1 commands
no
checking tirpc/rpc/xdr.h presence... no
checking for tirpc/rpc/xdr.h... no
Adding multilib support to Makefile in ../../../../src-trunk/libatomic
with_multisubdir=32
config.status: executing depfiles commands
configure: updating cache ./config.cache
configure: creating ./config.status
config.status: executing libtool commands
config.status: executing gstdint.h commands
config.status: executing depfiles commands
config.status: executing libtool commands
config.status: executing gstdint.h commands
config.status: creating Makefile
config.status: creating libsanitizer.spec
config.status: creating libbacktrace/backtrace-supported.h
config.status: creating interception/Makefile
Adding multilib support to interception/Makefile in ../../../../src-trunk/libsanitizer
with_multisubdir=32
config.status: creating sanitizer_common/Makefile
Adding multilib support to sanitizer_common/Makefile in ../../../../src-trunk/libsanitizer
with_multisubdir=32
config.status: creating libbacktrace/Makefile
Adding multilib support to libbacktrace/Makefile in ../../../../src-trunk/libsanitizer
with_multisubdir=32
config.status: creating lsan/Makefile
Adding multilib support to lsan/Makefile in ../../../../src-trunk/libsanitizer
with_multisubdir=32
config.status: creating asan/Makefile
Adding multilib support to asan/Makefile in ../../../../src-trunk/libsanitizer
with_multisubdir=32
config.status: creating ubsan/Makefile
Adding multilib support to ubsan/Makefile in ../../../../src-trunk/libsanitizer
with_multisubdir=32
config.status: creating config.h
config.status: executing default-1 commands
Adding multilib support to Makefile in ../../../../src-trunk/libsanitizer
with_multisubdir=32
config.status: executing depfiles commands
config.status: executing libtool commands
config.status: executing gstdint.h commands
config.status: executing depfiles commands
config.status: executing libtool commands
config.status: executing gstdint.h commands
make[4]: Leaving directory '/export/gnu/import/git/gcc-test/bld'
Makefile:23809: recipe for target 'bootstrap' failed
make[3]: *** [bootstrap] Error 2
make[3]: Leaving directory '/export/gnu/import/git/gcc-test/bld'
12517.11user 287.65system 35:18.93elapsed 604%CPU (0avgtext+0avgdata 558700maxresident)k
48inputs+21754368outputs (0major+126571199minor)pagefaults 0swaps
Makefile:294: recipe for target 'bootstrap' failed
make[2]: *** [bootstrap] Error 2
make[2]: Leaving directory '/export/gnu/import/git/gcc-test'