https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87302
Bug ID: 87302 Summary: -mfpu=auto -march=armv8-a does not work Product: gcc Version: 8.2.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: target Assignee: unassigned at gcc dot gnu.org Reporter: nsz at gcc dot gnu.org Target Milestone: --- i think the following inconsistency is problematic: on a hard float toolchain (-mfloat-abi=hard): $ arm-none-linux-gnueabihf-gcc -mfpu=auto -march=armv7-a a.c ; echo $? cc1: error: -mfloat-abi=hard: selected processor lacks an FPU 1 $ arm-none-linux-gnueabihf-gcc -mfpu=auto -march=armv7-a+fp a.c ; echo $? 0 $ arm-none-linux-gnueabihf-gcc -mfpu=auto -march=armv8-a a.c ; echo $? cc1: error: -mfloat-abi=hard: selected processor lacks an FPU 1 $ arm-none-linux-gnueabihf-gcc -mfpu=auto -march=armv8-a+fp a.c ; echo $? arm-none-linux-gnueabihf-gcc: error: 'armv8-a' does not support feature 'fp' arm-none-linux-gnueabihf-gcc: note: valid feature names are: crc simd crypto nocrypto nofp; did you mean 'nofp'? 1 $ arm-none-linux-gnueabihf-gcc -mfpu=auto -march=armv8-a+simd a.c ; echo $? 0 so it seems neither armv8-a nor armv8-a+fp work with -mfpu=auto, but armv8-a+simd and armv7-a+fp do.