https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83206
--- Comment #3 from Andrew Roberts <andrewm.roberts at sky dot com> --- ok confirmed, this bug is still present on the gcc-7 branch, with the current snapshot: /usr/local/gcc-7.2.1/bin/gcc -v Using built-in specs. COLLECT_GCC=/usr/local/gcc-7.2.1/bin/gcc COLLECT_LTO_WRAPPER=/usr/local/gcc-7.2.1/bin/../libexec/gcc/armv7l-unknown-linux-gnueabihf/7.2.1/lto-wrapper Target: armv7l-unknown-linux-gnueabihf Configured with: ../gcc-7.3.0/configure --prefix=/usr/local/gcc-7.3.0 --program-suffix= --disable-werror --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-linker-hash-style=gnu --enable-plugin --enable-gnu-indirect-function --enable-lto --with-isl --enable-languages=c,c++,fortran,lto --disable-libgcj --enable-clocale=gnu --disable-libstdcxx-pch --enable-install-libiberty --disable-multilib --disable-libssp --enable-default-pie --enable-default-ssp --host=armv7l-unknown-linux-gnueabihf --build=armv7l-unknown-linux-gnueabihf --with-arch=armv7-a --with-float=hard --with-fpu=vfpv3-d16 --disable-bootstrap Thread model: posix gcc version 7.2.1 20171123 (GCC) /usr/local/gcc-7.2.1/bin/gcc -march=native -mcpu=cortex-a53 -mfpu=auto -Ofast -o matrix matrix.c cc1: error: -mfloat-abi=hard: selected processor lacks an FPU Also the gcc man pages for 7.2.1 lack documentation for the -mfpu=auto option, although it is accepted as an argument (gcc 8 does document it) On 7.2.1 man page: -mfpu=name This specifies what floating-point hardware (or hardware emulation) is available on the target. Permissible names are: vfpv2, vfpv3, vfpv3-fp16, vfpv3-d16, vfpv3-d16-fp16, vfpv3xd, vfpv3xd-fp16, neon-vfpv3, neon-fp16, vfpv4, vfpv4-d16, fpv4-sp-d16, neon-vfpv4, fpv5-d16, fpv5-sp-d16, fp-armv8, neon-fp-armv8 and crypto-neon-fp-armv8. Note that neon is an alias for neon-vfpv3 and vfp is an alias for vfpv2. On 8.0.0 man page: -mfpu=name This specifies what floating-point hardware (or hardware emulation) is available on the target. Permissible names are: auto, vfpv2, vfpv3, vfpv3-fp16, vfpv3-d16, vfpv3-d16-fp16, vfpv3xd, vfpv3xd-fp16, neon-vfpv3, neon-fp16, vfpv4, vfpv4-d16, fpv4-sp-d16, neon-vfpv4, fpv5-d16, fpv5-sp-d16, fp-armv8, neon-fp-armv8 and crypto-neon-fp-armv8. Note that neon is an alias for neon-vfpv3 and vfp is an alias for vfpv2.