seen with the 4.8.0 release candidate on arm-linux-gnueabi{,hf} /build/buildd-gcc-4.8_4.8-20130315-1-armhf-5HYdhU/gcc-4.8-4.8-20130315/build/./prev-gcc/xg++ -B/build/buildd-gcc-4.8_4.8-20130315-1-armhf-5HYdhU/gcc-4.8-4.8-20130315/build/./prev-gcc/ -B/usr/arm-linux-gnueabihf/bin/ -nostdinc++ -B/build/buildd-gcc-4.8_4.8-20130315-1-armhf-5HYdhU/gcc-4.8-4.8-20130315/build/prev-arm-linux-gnueabihf/libstdc++-v3/src/.libs -B/build/buildd-gcc-4.8_4.8-20130315-1-armhf-5HYdhU/gcc-4.8-4.8-20130315/build/prev-arm-linux-gnueabihf/libstdc++-v3/libsupc++/.libs -I/build/buildd-gcc-4.8_4.8-20130315-1-armhf-5HYdhU/gcc-4.8-4.8-20130315/build/prev-arm-linux-gnueabihf/libstdc++-v3/include/arm-linux-gnueabihf -I/build/buildd-gcc-4.8_4.8-20130315-1-armhf-5HYdhU/gcc-4.8-4.8-20130315/build/prev-arm-linux-gnueabihf/libstdc++-v3/include -I/build/buildd-gcc-4.8_4.8-20130315-1-armhf-5HYdhU/gcc-4.8-4.8-20130315/src/libstdc++-v3/libsupc++ -L/build/buildd-gcc-4.8_4.8-20130315-1-armhf-5HYdhU/gcc-4.8-4.8-20130315/build/prev-arm-linux-gnueabihf/libstdc++-v3/src/.libs -L/build/buildd-gcc-4.8_4.8-20130315-1-armhf-5HYdhU/gcc-4.8-4.8-20130315/build/prev-arm-linux-gnueabihf/libstdc++-v3/libsupc++/.libs -c -g -O2 -gtoggle -DIN_GCC -fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -Wmissing-format-attribute -pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Werror -DHAVE_CONFIG_H -I. -I. -I../../src/gcc -I../../src/gcc/. -I../../src/gcc/../include -I../../src/gcc/../libcpp/include -I../../src/gcc/../libdecnumber -I../../src/gcc/../libdecnumber/dpd -I../libdecnumber -I../../src/gcc/../libbacktrace -DCLOOG_INT_GMP ../../src/gcc/ira.c -o ira.o ../../src/gcc/ira.c: In function 'void print_translated_classes(FILE*, bool)': ../../src/gcc/ira.c:1396:49: error: iteration 16u invokes undefined behavior [-Werror=aggressive-loop-optimizations] fprintf (f, " %s -> %s\n", reg_class_names[i], ^ ../../src/gcc/ira.c:1395:3: note: containing loop for (i = 0; i < N_REG_CLASSES; i++) ^ cc1plus: all warnings being treated as errors make[5]: *** [ira.o] Error 1 configured with Configured with: -v --with-pkgversion='Debian 4.8-20130315-1' --with-bugurl='file:///usr/share/doc/gcc-4.8/README.Bugs' --enable-languages=c,c++,go,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.8 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.8 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-libitm --enable-plugin --with-system-zlib --enable-objc-gc --enable-multiarch --disable-sjlj-exceptions --with-arch=armv7-a --with-fpu=vfpv3-d16 --with-float=hard --with-mode=thumb --enable-checking=release --build=arm-linux-gnueabihf --host=arm-linux-gnueabihf --target=arm-linux-gnueabihf and Configured with: -v --with-pkgversion='Debian 4.8-20130315-1' --with-bugurl='file:///usr/share/doc/gcc-4.8/README.Bugs' --enable-languages=c,c++,go,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.8 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.8 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-libitm --enable-plugin --with-system-zlib --enable-objc-gc --enable-multiarch --disable-sjlj-exceptions --with-arch=armv4t --with-float=soft --enable-checking=release --build=arm-linux-gnueabi --host=arm-linux-gnueabi --target=arm-linux-gnueabi
this fails for my Debian builds, as seen in https://buildd.debian.org/status/package.php?p=gcc-4.8&suite=experimental but succeeds for my Ubuntu build (the hard float configuration): https://launchpad.net/~ubuntu-toolchain-r/+archive/test/+build/4374070
the Debian builds use glibc-2.13 and binutils 2.22.x., the Ubuntu build glibc-2.17 and binutils-2.23.x
Created attachment 29683 [details] gcc48-pr56640.patch Untested fix.
Author: jakub Date: Sun Mar 17 16:28:16 2013 New Revision: 196753 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=196753 Log: PR target/56640 * config/arm/arm.h (REG_CLASS_NAMES): Add "SFP_REG" and "AFP_REG" class names. Remove trailing comma after "ALL_REGS". Modified: trunk/gcc/ChangeLog trunk/gcc/config/arm/arm.h
Author: jakub Date: Sun Mar 17 16:28:55 2013 New Revision: 196754 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=196754 Log: PR target/56640 * config/arm/arm.h (REG_CLASS_NAMES): Add "SFP_REG" and "AFP_REG" class names. Remove trailing comma after "ALL_REGS". Modified: branches/gcc-4_8-branch/gcc/ChangeLog branches/gcc-4_8-branch/gcc/config/arm/arm.h
Fixed.