For reference, trunk r178719 fails to build in an A9 or ARMv5 configuration:
http://builds.linaro.org/toolchain/gcc-4.7~svn178719/logs/armv7l-natty-cbuild181-ursa4-cortexa9r1/
The error is:
/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/./prev-gcc/g++
-B/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/./prev-gcc/
-B/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/install/armv7l-unknown-linux-gnueabi/bin/
-nostdinc++
-B/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/src/.libs
-B/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/libsupc++/.libs
-I/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/include/armv7l-unknown-linux-gnueabi
-I/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/include
-I/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/gcc-4.7~/libstdc++-v3/libsupc++
-L/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/src/.libs
-L/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/libsupc++/.libs
-c -g -O2 -gtoggle -DIN_GCC -W -Wall -Wwrite-strings -Wcast-qual
-Wmissing-format-attribute -pedantic -Wno-long-long
-Wno-variadic-macros -Wno-overlength-strings -Werror -fno-common
-DHAVE_CONFIG_H -I. -I. -I../../../gcc-4.7~/gcc
-I../../../gcc-4.7~/gcc/. -I../../../gcc-4.7~/gcc/../include
-I../../../gcc-4.7~/gcc/../libcpp/include
-I../../../gcc-4.7~/gcc/../libdecnumber
-I../../../gcc-4.7~/gcc/../libdecnumber/dpd -I../libdecnumber
insn-peep.c -o insn-peep.o
../../../gcc-4.7~/gcc/config/arm/arm.md: In function 'const char*
output_319(rtx_def**, rtx)':
../../../gcc-4.7~/gcc/config/arm/arm.md:10636:78: error: unknown
conversion type character '(' in format [-Werror=format]
../../../gcc-4.7~/gcc/config/arm/arm.md:10636:78: error: unknown
conversion type character ')' in format [-Werror=format]
/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/./prev-gcc/g++
-B/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/./prev-gcc/
-B/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/install/armv7l-unknown-linux-gnueabi/bin/
-nostdinc++
-B/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/src/.libs
-B/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/libsupc++/.libs
-I/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/include/armv7l-unknown-linux-gnueabi
-I/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/include
-I/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/gcc-4.7~/libstdc++-v3/libsupc++
-L/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/src/.libs
-L/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/libsupc++/.libs
-c -g -O2 -gtoggle -DIN_GCC -W -Wall -Wwrite-strings -Wcast-qual
-Wmissing-format-attribute -pedantic -Wno-long-long
-Wno-variadic-macros -Wno-overlength-strings -Werror -fno-common
-DHAVE_CONFIG_H -I. -I. -I../../../gcc-4.7~/gcc
-I../../../gcc-4.7~/gcc/. -I../../../gcc-4.7~/gcc/../include
-I../../../gcc-4.7~/gcc/../libcpp/include
-I../../../gcc-4.7~/gcc/../libdecnumber
-I../../../gcc-4.7~/gcc/../libdecnumber/dpd -I../libdecnumber
insn-preds.c -o insn-preds.o
cc1plus: all warnings being treated as errors
-- Michael
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