GCC build failure, HEAD@190918 on native

[GCC regression tester]

With your recent patch, GCC HEAD revision 190918 had problems on:
native: build (about the same as the previous build)
Attached is build output for those targets.
The previous build was of revision 190914.

Log information for changes since the last build:
------------------------------------------------------------------------
r190918 | rguenth | 2012-09-04 02:28:58 -0700 (Tue, 04 Sep 2012) | 8 lines
Changed paths:
   M /trunk/gcc/ChangeLog
   M /trunk/gcc/testsuite/ChangeLog
   A /trunk/gcc/testsuite/gcc.dg/torture/pr54458.c
   M /trunk/gcc/tree-ssa-threadupdate.c

2012-09-04  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/54458
	* tree-ssa-threadupdate.c (thread_through_loop_header): If we
	turn the loop into one with multiple latches mark it so.

	* gcc.dg/torture/pr54458.c: New testcase.

------------------------------------------------------------------------

For more information, see <http://glutton.geoffk.org/HEAD/>.

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/bin/sh ../../libtool --tag CXX --tag disable-shared   --mode=compile /home/regress/tbox/native/build/./gcc/xgcc -shared-libgcc -B/home/regress/tbox/native/build/./gcc -nostdinc++ -L/home/regress/tbox/native/build/i686-pc-linux-gnu/libstdc++-v3/src -L/home/regress/tbox/native/build/i686-pc-linux-gnu/libstdc++-v3/src/.libs -B/home/regress/tbox/objs/i686-pc-linux-gnu/bin/ -B/home/regress/tbox/objs/i686-pc-linux-gnu/lib/ -isystem /home/regress/tbox/objs/i686-pc-linux-gnu/include -isystem /home/regress/tbox/objs/i686-pc-linux-gnu/sys-include    -I/home/regress/tbox/svn-gcc/libstdc++-v3/../libgcc -I/home/regress/tbox/native/build/i686-pc-linux-gnu/libstdc++-v3/include/i686-pc-linux-gnu -I/home/regress/tbox/native/build/i686-pc-linux-gnu/libstdc++-v3/include -I/home/regress/tbox/svn-gcc/libstdc++-v3/libsupc++  -std=gnu++11 -prefer-pic -fno-implicit-templates -Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi  -fdiagnostics-show-location=once   -ffunction-sections -fdata-sections  -fr!
 andom-seed=fstream-inst.lo -g -O2 -D_GNU_SOURCE -c -o fstream-inst.lo /home/regress/tbox/svn-gcc/libstdc++-v3/src/c++11/fstream-inst.cc
libtool: compile:  /home/regress/tbox/native/build/./gcc/xgcc -shared-libgcc -B/home/regress/tbox/native/build/./gcc -nostdinc++ -L/home/regress/tbox/native/build/i686-pc-linux-gnu/libstdc++-v3/src -L/home/regress/tbox/native/build/i686-pc-linux-gnu/libstdc++-v3/src/.libs -B/home/regress/tbox/objs/i686-pc-linux-gnu/bin/ -B/home/regress/tbox/objs/i686-pc-linux-gnu/lib/ -isystem /home/regress/tbox/objs/i686-pc-linux-gnu/include -isystem /home/regress/tbox/objs/i686-pc-linux-gnu/sys-include -I/home/regress/tbox/svn-gcc/libstdc++-v3/../libgcc -I/home/regress/tbox/native/build/i686-pc-linux-gnu/libstdc++-v3/include/i686-pc-linux-gnu -I/home/regress/tbox/native/build/i686-pc-linux-gnu/libstdc++-v3/include -I/home/regress/tbox/svn-gcc/libstdc++-v3/libsupc++ -std=gnu++11 -fno-implicit-templates -Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi -fdiagnostics-show-location=once -ffunction-sections -fdata-sections -frandom-seed=fstream-inst.lo -g -O2 -D_GNU_SOURCE -c /home/regress/tbox/s!
 vn-gcc/libstdc++-v3/src/c++11/fstream-inst.cc  -fPIC -DPIC -o fstream-inst.o
/tmp/ccmqySfZ.s: Assembler messages:
/tmp/ccmqySfZ.s:44: Error: no such instruction: `rdrand %eax'
make[6]: *** [random.lo] Error 1
make[6]: *** Waiting for unfinished jobs....
make[6]: Leaving directory `/home/regress/tbox/native/build/i686-pc-linux-gnu/libstdc++-v3/src/c++11'
make[5]: *** [all-recursive] Error 1
make[5]: Leaving directory `/home/regress/tbox/native/build/i686-pc-linux-gnu/libstdc++-v3/src'
make[4]: *** [all-recursive] Error 1
make[4]: Leaving directory `/home/regress/tbox/native/build/i686-pc-linux-gnu/libstdc++-v3'
make[3]: *** [all] Error 2
make[3]: Leaving directory `/home/regress/tbox/native/build/i686-pc-linux-gnu/libstdc++-v3'
make[2]: *** [all-stage1-target-libstdc++-v3] Error 2
make[2]: Leaving directory `/home/regress/tbox/native/build'
make[1]: *** [stage1-bubble] Error 2
make[1]: Leaving directory `/home/regress/tbox/native/build'
make: *** [bootstrap] Error 2
+ '[' -s .bad_compare ']'
+ exit 1
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-- 
Geoffrey Keating <geoffk@geoffk.org> 
(via an automated GCC regression-testing script.)