$ aarch64-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=aarch64-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/opt/toolchains/aarch64-linux-4.9/bin/../libexec/gcc/aarch64-linux-gnu/4.9.2/lto-wrapper
Target: aarch64-linux-gnu
Configured with: /cbuild/slaves/oorts/crosstool-ng/builds/aarch64-linux-gnu-linux/.build/src/gcc-linaro-4.9-2014.09/configure --build=i686-build_pc-linux-gnu --host=i686-build_pc-linux-gnu --target=aarch64-linux-gnu --prefix=/cbuild/slaves/oorts/crosstool-ng/builds/aarch64-linux-gnu-linux/install --with-sysroot=/cbuild/slaves/oorts/crosstool-ng/builds/aarch64-linux-gnu-linux/install/aarch64-linux-gnu/libc --enable-languages=c,c++,fortran --disable-multilib --enable-multiarch --with-arch=armv8-a --with-pkgversion='crosstool-NG linaro-1.13.1-4.9-2014.09 - Linaro GCC 4.9-2014.09' --with-bugurl=https://bugs.launchpad.net/gcc-linaro --enable-__cxa_atexit --disable-libmudflap --enable-libgomp --disable-libssp --with-gmp=/cbuild/slaves/oorts/crosstool-ng/builds/aarch64-linux-gnu-linux/.build/aarch64-linux-gnu/build/static --with-mpfr=/cbuild/slaves/oorts/crosstool-ng/builds/aarch64-linux-gnu-linux/.build/aarch64-linux-gnu/build/static --with-mpc=/cbuild/slaves/oorts/crosstool-ng/builds/aarch64-linux-gnu-linux/.build/aarch64-linux-gnu/build/static --with-isl=/cbuild/slaves/oorts/crosstool-ng/builds/aarch64-linux-gnu-linux/.build/aarch64-linux-gnu/build/static --with-cloog=/cbuild/slaves/oorts/crosstool-ng/builds/aarch64-linux-gnu-linux/.build/aarch64-linux-gnu/build/static --with-libelf=/cbuild/slaves/oorts/crosstool-ng/builds/aarch64-linux-gnu-linux/.build/aarch64-linux-gnu/build/static --enable-threads=posix --disable-libstdcxx-pch --enable-linker-build-id --enable-plugin --with-local-prefix=/cbuild/slaves/oorts/crosstool-ng/builds/aarch64-linux-gnu-linux/install/aarch64-linux-gnu/libc --enable-c99 --enable-long-long
Thread model: posix
gcc version 4.9.2 20140904 (prerelease) (crosstool-NG linaro-1.13.1-4.9-2014.09 - Linaro GCC 4.9-2014.09)