buildspec.aarch64

# Target architecture in docker parlance. This is essentially $GOARCH, per the
# manifest spec at https://docs.docker.com/registry/spec/manifest-v2-2/
#
# The "linux/" OS prefix is assumed.
#
export ARCH=arm64

# The advertised variant that will be used in the manifest.
export VARIANT=v8

# GCC arch flags to ensure we get the right architecture-specific features.
#
# In this case, we want the ARM v8.2-a instruction set in order to fully capitalize
# on atomic instructions.
#
# See https://gcc.gnu.org/onlinedocs/gcc/ARM-Options.html#index-march-2
#     https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html#index-march-14
#     https://github.com/aws/aws-graviton-getting-started/blob/master/c-c%2B%2B.md
#
export ARCH_FLAGS=armv8.2-a+fp16+rcpc+dotprod+crypto

# The GNU triplet toolchain for cross-compiling to the specified architecture.
# These are specifically "debian multiarch tuples" per https://wiki.debian.org/Multiarch/Tuples
export TOOLCHAIN=aarch64-linux-gnu
export TOOLCHAIN_PREFIX=aarch64-linux-gnu

# Valid openssl targets are defined in openssl/Configurations/10-main.conf.
export OPENSSL_TARGET=linux-aarch64