toolchain/fuchsia/BUILD.gn

# Copyright 2016 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import("//build/toolchain/clang_toolchain.gni")
import("//build/config/fuchsia/config.gni")

template("fuchsia_toolchain") {
  clang_toolchain(target_name) {
    forward_variables_from(invoker, "*")

    if (host_cpu == "arm64") {
      clang_cpu = "aarch64"
    } else if (host_cpu == "x64") {
      clang_cpu = "x86_64"
    } else {
      assert(false, "Host CPU not supported")
    }

    if (host_os == "linux") {
      clang_os = "linux"
    } else if (host_os == "mac") {
      clang_os = "darwin"
    } else {
      assert(false, "Host OS not supported")
    }

    clang_name = "clang+llvm-$clang_cpu-$clang_os"
    clang_path = "$fuchsia_sdk/toolchain/$clang_name"
    prefix = rebase_path("$clang_path/bin/", root_build_dir)

    cc = "${prefix}clang"
    cxx = "${prefix}clang++"
    ld = cxx
    ar = "${prefix}llvm-ar"
    strip = "${prefix}strip"

    toolchain_cpu = target_cpu
    toolchain_os = target_os
  }
}

# The fuchsia toolchains require an assembled sysroot in order to do anything,
# so we need to create a dependency edge between all targets using the fuchsia
# toolchain and the sysroot assembly step. The cleanest way to do this in GN is
# by creating a toolchain dependency from the fuchsia toolchains to the
# assembly step. Since all targets in GN exist within a toolchain, and all
# targets inside the fuchsia toolchain need to depend on the sysroot assembly
# step, we need to create another toolchain to contain the sysroot assembly
# target.
fuchsia_toolchain("${target_cpu}-sysroot") {
}

fuchsia_toolchain(target_cpu) {
  deps = [
    "//build/sysroot(//build/toolchain/fuchsia:${target_cpu}-sysroot)",
  ]
}
fuchsia_toolchain("${target_cpu}-shared") {
  is_pic_default = true
  deps = [
    "//build/sysroot(//build/toolchain/fuchsia:${target_cpu}-sysroot)",
  ]
}