declare_args() {
  # If set, this is prepended to compile action command lines (e.g. `"ccache"`).
  compiler_wrapper = ""

  # Set this to a clang build directory. If set, that clang is used as compiler.
  # On Windows, setting this also causes lld-link to be used as linker.
  # Example value: getenv("HOME") + "/src/llvm-build/Release+Asserts"
  clang_base_path = ""

  # Set this to the path to Android NDK r21. If set, cross compilation targeting
  # Android will be enabled.
  android_ndk_path = ""

  # Set this to the path of the Win SDK. Only used for cross compilation. If set, cross compilation targeting Windows will be enabled.
  win_sysroot = ""
}

declare_args() {
  # Set if the host compiler is clang.  On by default on Mac or if
  # clang_base_path is set.
  is_clang = host_os == "mac" || clang_base_path != ""

  # Set this to true to link with LLD instead of the default linker.
  use_lld = clang_base_path != ""
}

assert(
    !(host_os == "win" && win_sysroot != ""),
    "win_sysroot should only be used for cross compilation, use sysroot on Windows")