Restructure build_package_enable_yjit to be cleaner and to exit before later checks if possible.

}

build_package_enable_yjit() {

  local rustc_installed x86_arch rustc_ver

  # If YJIT is explicitly enabled or disabled, don't change the config

  ([[ " ${RUBY_CONFIGURE_OPTS} " == *" --enable-yjit"* ]] || [[ " ${RUBY_CONFIGURE_OPTS} " == *" --disable-yjit"* ]]) && return 0;

  rustc_installed=""

  if type -p rustc &>/dev/null; then

    rustc_ver=`rustc --version`

    # Some kind of built-in bash comparison for dotted version strings would be awesome.

    if [[ "${rustc_ver}" == *"rustc 1."[6789]* ]]; then

      rustc_installed="1"

    fi

  fi

  # If we aren't on x86_64, don't enable YJIT

  [[ "$(uname -m)" != "x86_64" ]] && return 0;

  x86_arch=""

  if [[ "$(uname -m)" == "x86_64" ]]; then

    x86_arch="1"

  fi

  local rustc_ver

  # If YJIT is explicitly specified or we're not on x86_64, don't change anything

  if [[ "${x86_arch}" == "1" ]] && [[ " ${RUBY_CONFIGURE_OPTS} " != *" --enable-yjit"* ]] && [[ " ${RUBY_CONFIGURE_OPTS} " != *" --disable-yjit"* ]]; then

    if [[ "${rustc_installed}" == "1" ]]; then

  (type -p rustc &>/dev/null) || return 0;

  rustc_ver=`rustc --version`

  # Some kind of built-in bash comparison for dotted version strings would be awesome.

  if [[ "${rustc_ver})" == *"rustc 1."[6789]* ]]; then

    echo "Building with YJIT by default because ${rustc_ver} is installed; add RUBY_CONFIGURE_OPTS='--disable-yjit' to disable explicitly"

    package_option ruby configure --enable-yjit

  else

    echo "rustc 1.60+ is not installed, YJIT will not be built; if you want to use YJIT, install rustc 1.60+ and rerun this command."

  fi

  fi

}

build_package_enable_shared() {