# Copyright 2018 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/config/clang/clang.gni")

# This is $root_build_dir in the Zircon GN build.
# **NOTE!** This is not a subdirectory of $root_build_dir because that
# makes GN insist that it understand where all files in there come from.
# We instead require that users (or `fx build`) run ninja in
# $zircon_root_build_dir before running ninja in $root_build_dir.
zircon_root_build_dir = "${root_build_dir}.zircon"

# Zircon tools get added to that directory by the Fuchsia GN build.
# When using to a tool from this directory, add the corresponding dependency on
# `//zircon/public/tool/$tool_name($host_toolchain)`.
zircon_tools_dir =
    get_label_info("//zircon/public/tool($host_toolchain)", "root_out_dir")

# Template for running a Zircon host tool as part of the build.
# This is a thin wrapper to define an `action()` target.
#
# Parameters
#
#     tool (required)
#         [string] The name of the tool, like "mkbootfs".
#
#     args (required)
#         [list of strings] The arguments to pass the tool.
#         The tool runs with `root_build_dir` as its current directory,
#         so any file names should be made either absolute or relative
#         to `root_build_dir` using `rebase_path()`.
#
# All other parameters are exactly as for `action()`, except
# that `script` is replaced with `tool`.
#
template("zircon_tool_action") {
  assert(defined(invoker.tool), "zircon_tool_action() requires `tool`")
  assert(defined(invoker.args), "zircon_tool_action() requires `args`")
  _dep = "//zircon/public/tool/${invoker.tool}($host_toolchain)"
  _tool = "$zircon_tools_dir/${invoker.tool}"
  action(target_name) {
    inputs = []
    forward_variables_from(invoker,
                           [
                             "testonly",
                             "visibility",
                           ])
    forward_variables_from(invoker,
                           "*",
                           [
                             "args",
                             "script",
                             "tool",
                             "testonly",
                             "visibility",
                           ])
    script = "//build/gn_run_binary.sh"
    inputs += [ _tool ]
    args = [
             clang_prefix,
             rebase_path(_tool, root_build_dir),
           ] + invoker.args
    if (!defined(deps)) {
      deps = []
    }
    deps += [ _dep ]
  }
}