BUILDCONFIG.gn

# 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.

# This BUILDCONFIG file tells GN how to build upstream Pigweed. When starting a
# new project, you'll need to copy this file to your project and then modify it
# to fit your needs. Due to the way Pigweed handles file imports, you won't be
# able to simply import this file in your own BUILDCONFIG.gn.
#
# Keep in mind when importing .gni files that `gn format` will try to
# alphabetically sort imports unless they're separated by comments. For this
# file, import order matters (modules.gni MUST be imported first).

# This is imported into a scope so as not to pollute the global variable space.
_pigweed_directory = {
  import("//build_overrides/pigweed.gni")
}

_pigweed_modules = {
  # Import target configuration. This is what "completes" a Pigweed
  # configuration. This file should set a default toolchain, configure
  # pw_executable, select backends to build against, and provide target-specific
  # build arguments.
  import("${_pigweed_directory.dir_pigweed}/legacy_target.gni")
}

# Ensure some sort of default toolchain was provided by the target, and then
# set the default toolchain.
assert(_pigweed_modules.pw_target_toolchain != "",
       "Build target must provide its own toolchain.")

# The default toolchain is not used in Pigweed builds, so it is set to a dummy
# toolchain. The top-level BUILD.gn should stamp a group with all of the build
# targets and their toolchains.
set_default_toolchain("${_pigweed_modules.dir_pw_toolchain}/dummy")