Mine

checking for gxx-include-dir... no
checking for --enable-version-specific-runtime-libs... no
checking for install location... ${prefix}/include/c++/${gcc_version}
configure: creating ./config.status
config.status: creating Makefile
config.status: creating include/Makefile
config.status: creating libmath/Makefile
config.status: creating libsupc++/Makefile
config.status: creating src/Makefile
config.status: creating po/Makefile
config.status: creating testsuite/Makefile
config.status: creating scripts/testsuite_flags
config.status: creating config.h
config.status: config.h is unchanged
config.status: executing default-1 commands
Adding multilib support to Makefile in /usr/home/mj/openwrt/trunk/toolchain_build_i386/gcc-4.1.1/libstdc++-v3
multidirs=
with_multisubdir=
config.status: executing default commands
gmake[6]: Entering directory `/usr/home/mj/openwrt/trunk/toolchain_build_i386/gcc-4.1.1-final/i386-linux-uclibc/libstdc++-v3/include'
gmake[6]: Nothing to be done for `all'.
gmake[6]: Leaving directory `/usr/home/mj/openwrt/trunk/toolchain_build_i386/gcc-4.1.1-final/i386-linux-uclibc/libstdc++-v3/include'
Configuring in i386-linux-uclibc/libiberty
configure: loading cache ./config.cache
configure: error: `CC' has changed since the previous run:
configure:   former value:  /usr/home/mj/openwrt/trunk/toolchain_build_i386/gcc-4.1.1-final/./gcc/xgcc -B/usr/home/mj/openwrt/trunk/toolchain_build_i386/gcc-4.1.1-final/./gcc/ -B/home/mj/openwrt/trunk/staging_dir_i386/i386-linux-uclibc/bin/ -B/home/mj/openwrt/trunk/staging_dir_i386/i386-linux-uclibc/lib/ -isystem /home/mj/openwrt/trunk/staging_dir_i386/i386-linux-uclibc/include -isystem /home/mj/openwrt/trunk/staging_dir_i386/i386-linux-uclibc/sys-include
configure:   current value: /usr/home/mj/openwrt/trunk/toolchain_build_i386/gcc-4.1.1-final/./gcc/xgcc -B/usr/home/mj/openwrt/trunk/toolchain_build_i386/gcc-4.1.1-final/./gcc/ -B/usr/home/mj/openwrt/trunk/staging_dir_i386/i386-linux-uclibc/bin/ -B/usr/home/mj/openwrt/trunk/staging_dir_i386/i386-linux-uclibc/lib/ -isystem /usr/home/mj/openwrt/trunk/staging_dir_i386/i386-linux-uclibc/include -isystem /usr/home/mj/openwrt/trunk/staging_dir_i386/i386-linux-uclibc/sys-include
configure: error: changes in the environment can compromise the build
configure: error: run `make distclean' and/or `rm ./config.cache' and start over
gmake[5]: *** [configure-target-libiberty] Error 1
gmake[5]: Leaving directory `/usr/home/mj/openwrt/trunk/toolchain_build_i386/gcc-4.1.1-final'
gmake[4]: *** [all] Error 2
gmake[4]: Leaving directory `/usr/home/mj/openwrt/trunk/toolchain_build_i386/gcc-4.1.1-final'
gmake[3]: *** [/usr/home/mj/openwrt/trunk/staging_dir_i386/stampfiles/.host_gcc-installed] Error 2
gmake[3]: Leaving directory `/usr/home/mj/openwrt/trunk/toolchain/gcc'
gmake[2]: *** [gcc-install] Error 2
gmake[2]: Leaving directory `/usr/home/mj/openwrt/trunk/toolchain'
gmake[1]: *** [toolchain/install] Error 2
gmake[1]: Leaving directory `/usr/home/mj/openwrt/trunk'
gmake: *** [world] Error 2
*** Error code 2

Stop in /usr/home/mj/openwrt/trunk.
greebo% rm ./config.cache
rm: ./config.cache: No such file or directory