gn/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/gn/packages.gni")
import("//build/package.gni")
import("//build/toolchain/goma.gni")

# Permit dependencies on testonly targets from packages.
testonly = true

group("packages") {
  deps = package_targets
  data_deps = package_data_deps
}

group("default") {
  deps = [
    ":host_tests",
    ":packages",
  ]
  if (package_targets != []) {
    deps += [
      "//build/images",
      "//build/images:updates",
    ]
  }
}

# Instantiate the packages synthesized from the build argument.
foreach(pkg, synthesize_packages) {
  package(pkg.name) {
    forward_variables_from(pkg, "*", [ "name" ])
  }
}

# Copy host test binaries to $root_build_dir/host_tests.
if (package_host_tests != []) {
  copy("host_tests") {
    deps = []
    sources = []
    bindir = get_label_info("//anything($host_toolchain)", "root_out_dir")
    foreach(label, package_host_tests) {
      deps += [ "$label($host_toolchain)" ]
      binary = get_label_info(label, "name")
      sources += [ "$bindir/$binary" ]
    }
    outputs = [
      "$root_build_dir/host_tests/{{source_file_part}}",
    ]
  }
} else {
  group("host_tests") {
  }
}

# TODO(BLD-31): This Zircon->GN magic needs some comments.

zircon_files =
    exec_script("//build/zircon/list_source_files.py", [], "list lines")

supporting_templates = [
  "//build/zircon/boards.mako",
  "//build/zircon/header.mako",
  "//build/zircon/host_tool.mako",
  "//build/zircon/main.mako",
  "//build/zircon/shared_library.mako",
  "//build/zircon/source_library.mako",
  "//build/zircon/static_library.mako",
  "//build/zircon/sysroot.mako",
]

# The following script generates GN build files for Zircon objects. It is placed
# before everything else so that //zircon targets are available in due time.
# See //build/zircon/README.md for more details.
exec_script("//build/zircon/create_gn_rules.py",
            [
              "--out",
              rebase_path("//zircon/public"),
              "--staging",
              rebase_path("$root_out_dir/zircon-gn"),
              "--zircon-user-build",
              rebase_path("//out/build-zircon/build-\${target_cpu}"),
              "--zircon-tool-build",
              rebase_path("//out/build-zircon"),
            ],
            "",
            zircon_files + supporting_templates)

# Write a file that can be sourced by `fx`.  This file is produced
# by `gn gen` and is not known to Ninja at all, so it has nothing to
# do with the build itself.  Its sole purpose is to leave bread
# crumbs about the settings `gn gen` used for `fx` to use later.
_relative_build_dir = rebase_path(root_build_dir, "//", "//")
_fx_config_lines = [
  "# Generated by `gn gen`.",
  "FUCHSIA_BUILD_DIR='${_relative_build_dir}'",
  "FUCHSIA_ARCH='${target_cpu}'",
]
if (use_goma) {
  _fx_config_lines += [
    "# This will affect Zircon's make via //scripts/build-zircon.sh.",
    "export GOMACC='${goma_dir}/gomacc'",
  ]
}
write_file("$root_build_dir/fx.config", _fx_config_lines)