# Copyright 2020 The Pigweed Authors
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not
# use this file except in compliance with the License. You may obtain a copy of
# the License at
#
#     https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations under
# the License.

import("//build_overrides/pigweed.gni")

import("$dir_pw_span/polyfill.gni")

declare_args() {
  # Default configs and dependencies targets provided by the toolchain. These
  # are applied to all of the pw_* target types. They are set from a toolchain's
  # toolchain_args for cross-toolchain deps, e.g. for
  #
  #   `deps = [ //pw_some_module(//pw_toolchain:not_default) ]`
  #
  # The default toolchain is never used.
  default_configs = []
  default_public_deps = []
  remove_default_configs = []

  # Controls the default visibility of C/C++ libraries and executables
  # (pw_source_set, pw_static_library, pw_shared_library pw_executable). This
  # can be "*" or a list of paths.
  #
  # This is useful for limiting usage of Pigweed modules via an explicit
  # allowlist. For the GN build to work, pw_build_DEFAULT_VISIBILITY must always
  # at least include the Pigweed repository ("$dir_pigweed/*").
  #
  # Explicitly setting a target's visibility overrides this default.
  pw_build_DEFAULT_VISIBILITY = "*"
}

# Combine target-specifc and target-agnostic default variables.
_pw_build_defaults = {
  configs = default_configs
  public_deps = default_public_deps

  # The target-agnostic defaults.
  configs += [
    "$dir_pw_build:colorize_output",
    "$dir_pw_build:debugging",
    "$dir_pw_build:reduced_size",
    "$dir_pw_build:strict_warnings",
    "$dir_pw_build:toolchain_cpp_standard",
    "$dir_pw_build:relative_paths",
  ]

  # TODO(b/235237667): Remove this once all uses explicitly depend on polyfills.
  if (pw_span_ENABLE_STD_SPAN_POLYFILL) {
    public_deps += [ "$dir_pw_span:polyfill" ]
  }
  if (pw_build_DEFAULT_VISIBILITY != "*") {
    visibility = pw_build_DEFAULT_VISIBILITY
  }
}

# One more pass, to remove configs
pw_build_defaults = {
  configs = []
  forward_variables_from(_pw_build_defaults, "*")
  if (remove_default_configs != []) {
    # Add them first to ensure they are present to be removed.
    configs += remove_default_configs
    configs -= remove_default_configs
  }
}