declare_args() {
  # ABI version of libc++. Can be either 1 or 2, where 2 is currently not stable. Defaults to 1.
  libcxx_abi_version = 1

  # The inline ABI namespace used by libc++. It defaults to __n where `n` is the current ABI version.
  libcxx_abi_namespace = ""

  # Unstable ABI of libc++.
  libcxx_abi_unstable = false
}