http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43085
--- Comment #9 from Artem Anisimov <aanisimov at inbox dot ru> 2010-10-12 12:28:10 UTC --- (In reply to comment #7) It's interesting to note that profiledbootstrap break amd64 build too, though for different reason: /home/artem/testing/gcc-build/./prev-gcc/xgcc -B/home/artem/testing/gcc-build/./prev-gcc/ -B/home/artem/testing/gcc46/x86_64-slackware-linux/bin/ -B/home/artem/testing/gcc46/x86_64-slackware-linux/bin/ -B/home/artem/testing/gcc46/x86_64-slackware-linux/lib/ -isystem /home/artem/testing/gcc46/x86_64-slackware-linux/include -isystem /home/artem/testing/gcc46/x86_64-slackware-linux/sys-include -c -DIN_GCC_FRONTEND -g -O2 -gtoggle -fprofile-generate -DIN_GCC -W -Wall -Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes -Wmissing-format-attribute -pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Werror -Wold-style-definition -Wc++-compat -DHAVE_CONFIG_H -I. -I. -I../../gcc-current/gcc -I../../gcc-current/gcc/. -I../../gcc-current/gcc/../include -I../../gcc-current/gcc/../libcpp/include -I../../gcc-current/gcc/../libdecnumber -I../../gcc-current/gcc/../libdecnumber/bid -I../libdecnumber -I/usr/include/libelf ../../gcc-current/gcc/c-parser.c -o c-parser.o ../../gcc-current/gcc/c-parser.c: In function 'c_parser_for_statement': ../../gcc-current/gcc/c-parser.c:4672:19: error: 'incr' may be used uninitialized in this function [-Werror=uninitialized] cc1: all warnings being treated as errors For amd64 I configured with these settings: ../gcc-current/configure --prefix=/home/artem/testing/gcc46 --enable-shared --enable-bootstrap --enable-languages=c,c++ --enable-threads=posix --enable-checking=release --with-system-zlib --disable-libunwind-exceptions --enable-__cxa_atexit --enable-libssp --with-gnu-ld --with-lto --disable-nls --verbose --with-arch=athlon64 --target=x86_64-slackware-linux --build=x86_64-slackware-linux --host=x86_64-slackware-linux --disable-multilib --enable-checking=release Doing normal (not profiled) build with these settings succeeds for me.