Bootstrap failure on sparc-sun-solaris2.10

[Art Haas <ahaas at impactweather dot com>]

I've had no success lately getting GCC to bootstrap successfully. My
last successful bootstrap was on September 6; my builds on September
7 through today all end with a comparison failure. Here's the end
of my build log:

gmake[2]: Entering directory `/export/home/arth/src/gcc-0929'
gmake[3]: Entering directory `/export/home/arth/src/gcc-0929'
rm -f stage_current
gmake[3]: Leaving directory `/export/home/arth/src/gcc-0929'
Comparing stages 2 and 3
warning: gcc/cc1-checksum.o differs
warning: gcc/cc1plus-checksum.o differs
warning: gcc/cc1obj-checksum.o differs
Bootstrap comparison failure!
libdecnumber/decNumber.o differs
gmake[2]: *** [compare] Error 1
gmake[2]: Leaving directory `/export/home/arth/src/gcc-0929'
gmake[1]: *** [stage3-bubble] Error 2
gmake[1]: Leaving directory `/export/home/arth/src/gcc-0929'
gmake: *** [bootstrap-lean] Error 2

My last successful build was configured like so:

$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/export/home/arth/local/libexec/gcc/sparc-sun-solaris2.10/4.7.0/lto-wrapper
Target: sparc-sun-solaris2.10
Configured with: /export/home/arth/src/gcc.git/configure --prefix=/export/home/arth/local --enable-languages=c,c++,objc --disable-nls --with-gmp=/export/home/arth/local --with-mpfr=/export/home/arth/local --with-mpc=/export/home/arth/local --enable-checking=release --enable-threads --with-gnu-as --with-as=/export/home/arth/local/bin/as --with-gnu-ld --with-ld=/export/home/arth/local/bin/ld --enable-libstdcxx-pch=no --with-cpu=ultrasparc3 --with-tune=ultrasparc3
Thread model: posix
gcc version 4.7.0 20110906 (experimental) [master revision bdc818b:c562c54:dfb98d7502700782f4a1a4e04357e46fd90784fe] (GCC)
$

I've seen numerous Sparc related patch land after my last successful
build, so I'm guessing the issue is Solaris specific. Anyone else who
builds on this platform seeing similar problems?

Art Haas