zircon/BUILD.gn

# Copyright 2019 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("$zx/public/gn/build_api_module.gni")
import("$zx/public/gn/config/standard.gni")
import("$zx/public/gn/toolchain/environment_redirect.gni")
import("$zx/public/gn/zbi.gni")

# Build the native host tools intended for developer use.
_tools_targets = [ "tools" ]
foreach(host, standard_build_hosts) {
  _tools_targets += [ "tools-${host.os}-${host.cpu}" ]
  environment_redirect("tools-${host.os}-${host.cpu}.redirect") {
    visibility = [ ":*" ]
    testonly = true
    environment_label = "$zx/public/gn/toolchain:host"
    cpu = host.cpu
    os = host.os
    deps = [
      "$zx/system/host:tools",
    ]
  }
}

group("tools.redirect") {
  visibility = [ ":*" ]
  testonly = true
  public_deps = [
    ":tools-${host_os}-${host_cpu}",
  ]
}

if (current_toolchain == default_toolchain) {
  # Install the host developer tools for the running host platform in the
  # "$root_build_dir/tools/" directory.
  foreach(tools_target, _tools_targets) {
    tools_rspfile = "$target_gen_dir/${tools_target}.rsp"
    generated_file("$tools_target.rsp") {
      visibility = [ ":$tools_target" ]
      testonly = true
      outputs = [
        tools_rspfile,
      ]
      deps = [
        ":$tools_target.redirect",
      ]
      output_conversion = "list lines"
      data_keys = [ "tool_executables" ]
    }

    action(tools_target) {
      testonly = true
      deps = [
        ":$tools_target.rsp",
      ]
      script = "$zx/scripts/copy-files"
      depfile = "$target_out_dir/$target_name.d"
      outputs = [
        depfile,
      ]
      sources = [
        tools_rspfile,
      ]
      args = [
        tools_target,
        rebase_path(depfile, root_build_dir),
        rebase_path(tools_rspfile, root_build_dir),
      ]
    }
  }
}

group("default") {
  testonly = true
  deps = [
    ":images",
    ":tools",
  ]
}

group("all-cpu") {
  testonly = true
  deps = []
  foreach(cpu, standard_fuchsia_cpus) {
    deps += [
      ":$cpu",
      ":core-tests-$cpu",
    ]
  }
}

foreach(cpu, standard_fuchsia_cpus) {
  if (current_toolchain == default_toolchain) {
    zbi("core-tests-$cpu") {
      output_dir = root_build_dir
      testonly = true
      cpu = cpu
      deps = [
        ":core-tests-$cpu-deps",
      ]
    }

    zbi(cpu) {
      output_dir = root_build_dir
      testonly = true
      cpu = cpu
      deps = [
        ":everything-$cpu",
      ]
    }
  }

  environment_redirect("core-tests-$cpu-deps") {
    visibility = [ ":*" ]
    testonly = true
    cpu = cpu
    environment_label = "$zx/public/gn/toolchain:user"
    deps = [
      "kernel",
      "system/utest:core-tests",
    ]
  }

  environment_redirect("everything-$cpu") {
    visibility = [ ":*" ]
    testonly = true
    environment_label = "$zx/public/gn/toolchain:user"
    cpu = cpu
    deps = [
      "$zx/kernel",
      "$zx/system/core",
      "$zx/system/dev",
      "$zx/system/uapp",
      "$zx/system/utest",
      "$zx/third_party/uapp",
    ]
    if (cpu == "x64") {
      deps += [ "$zx/bootloader" ]
    }
  }
}

# This is the top-level build API module that just lists all the others.
# Each element of the list is the simple name of the API module; the
# module's contents are found at "$root_build_dir/$target_name.json".
# Type: list(string)
build_api_module("api") {
  testonly = true
  data_keys = [ "build_api_modules" ]
  deps = [
    ":buildargs",
    ":images",
  ]
}

# This just regurgitates the build arguments specified to `gn gen`.  This is
# the exact JSON representation of the settings in "$root_build_dir/args.gn".
# It does not include build arguments left to their default values.  So to
# reproduce the settings of this build, one could put in `args.gn`:
# ```
#   forward_variables_from(read_file("buildargs.json", "json"), "*")
# ```
# Type: scope
build_api_module("buildargs") {
  # The file does not exist at all if `gn gen` is run with no `--args`.  But
  # read_file() can't handle an optional file and there's no direct way to test
  # for file existence from GN.
  contents = exec_script("/bin/sh",
                         [
                           "-c",
                           "test ! -e args.gn || cat args.gn",
                         ],
                         "scope")
}

# This describes all the "image" files the build can produce.
#
# Consumers of the build should look here for the images to be built.
# The $cpu, $name, and $type fields identify the purpose of each image.
# Consumers are expected to ignore extra images they have no use for or
# whose fields they don't understand.
#
# The $path field indicates where the file is found in the build
# directory.  The presence of an image in the list means that the build
# *can* produce it, not that the build *will* produce it.  Hence,
# consumers should use $path as an explicit argument to Ninja to ensure
# that each needed image gets built.
#
# Type: list(scope)
#
#   cpu
#     Required: CPU architecture the image is for, e.g. "arm64" or "x64".
#     Type: string
#
#   name
#     Required: The primary way that this image is known to consumers.
#     Note that the name need not be unique within the images list.
#     The tuple of ($name, $type, $cpu) should be unique.
#     Type: string
#
#   label
#     Required: The GN label of the image target.
#     Type: label_with_toolchain
#
#   path
#     Required: Path to where the file is found, relative to $root_build_dir.
#     This is also the argument to Ninja that ensures this image will be built.
#     Type: path relative to $root_build_dir
#
#   type
#     Required: Type of file, e.g. "zbi".  This often corresponds to the
#     extension used on the image file name, but not always.  For many
#     miscellaneous formats, this is just "bin" and the consumer is
#     expected to understand what the particular format is for particular
#     $name, $cpu combinations.  Other types include:
#      * "zbi": the ZBI (<zircon/boot/image.h>) format
#      * "efi": an EFI executable that an EFI boot loader can load
#      * "kernel": some other format loaded by a boot loader or emulator
#      * "blk": contents to be written to a storage device or partition
#     Type: string
#
build_api_module("images") {
  testonly = true
  data_keys = [ "images" ]
  deps = [
    ":all-cpu",
  ]
}