build/toolchain/toolchain_suite.gni

# Converts a single toolchain definition into multple toolchains with
# different toolchain args.

# Even though these imports aren't used directly, they are required so
# that the template works when it is called.
import("//build/toolchain/android/android_toolchain.gni")
import("//build/toolchain/gcc_toolchain.gni")
if (host_os == "mac") {
  import("//build/toolchain/mac/mac_toolchain.gni")
}
if (is_win) {
  import("//build/toolchain/win/msvc_toolchain.gni")
}
if (is_fuchsia) {
  import("//build/toolchain/fuchsia/fuchsia_toolchain.gni")
}

_all_toolchains = [
  # default toolchain.
  {
    suffix = ""
    toolchain_args = {
      is_shared_library = false
    }
  },

  # toolchain for building shared libraries.
  {
    suffix = "_shared"
    toolchain_args = {
      is_shared_library = true
    }
  },
]

template("toolchain_suite") {
  assert(defined(invoker.toolchain_template),
         "tolchain_suite() must specify a \"toolchain_template\" value")
  _target_type = invoker.toolchain_template
  foreach(conf, _all_toolchains) {
    target(_target_type, "${target_name}${conf.suffix}") {
      forward_variables_from(invoker, "*", [ "toolchain_args" ])

      toolchain_args = {
        forward_variables_from(conf.toolchain_args, "*")
        if (defined(invoker.toolchain_args)) {
          forward_variables_from(invoker.toolchain_args, "*")
        }
      }
    }
  }
}