relibc_compiler-builtins/ci/env.sh

case $TRAVIS_OS_NAME in
    linux)
        export HOST=x86_64-unknown-linux-gnu
        ;;
    osx)
        export HOST=x86_64-apple-darwin
        ;;
esac

case $TARGET in
    aarch64-unknown-linux-gnu)
        export PREFIX=aarch64-linux-gnu-
        export QEMU_LD_PREFIX=/usr/aarch64-linux-gnu
        ;;
    arm*-unknown-linux-gnueabi)
        export PREFIX=arm-linux-gnueabi-
        export QEMU_LD_PREFIX=/usr/arm-linux-gnueabi
        ;;
    arm*-unknown-linux-gnueabihf)
        export PREFIX=arm-linux-gnueabihf-
        export QEMU_LD_PREFIX=/usr/arm-linux-gnueabihf
        ;;
esac