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https://fuchsia.googlesource.com/third_party/pigweed.googlesource.com/pigweed/pigweed
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2119240da1
- Override built-in targets, which gives more flexibility than set_defaults. - Provide the default C++ in the toolchain, which can be overridden by explicitly specifying a config on a target. - Remove the C++17 default flags from public configs, since it is no longer needed. Change-Id: If211bada971c46cef83909bf15811a4f2c1eb7fd
84 lines
3.2 KiB
Plaintext
84 lines
3.2 KiB
Plaintext
# Copyright 2020 The Pigweed Authors
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may not
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# use this file except in compliance with the License. You may obtain a copy of
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# the License at
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#
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# https://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations under
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# the License.
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# This BUILDCONFIG file tells GN how to build upstream Pigweed. When starting a
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# new project, you'll need to copy this file to your project and then modify it
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# to fit your needs. Due to the way Pigweed handles file imports, you won't be
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# able to simply import this file in your own BUILDCONFIG.gn.
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#
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# Keep in mind when importing .gni files that `gn format` will try to
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# alphabetically sort imports unless they're separated by comments. For this
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# file, import order matters (modules.gni MUST be imported first).
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declare_args() {
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# Location of the Pigweed modules directory (defaults to the directory of
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# this file). When copying this buildconfig into a new project, this should
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# be modified to point to the location of the Pigweed repository.
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dir_pigweed = get_path_info(get_path_info("BUILDCONFIG.gn", "abspath"), "dir")
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# Path to the Pigweed variables config file for the build target.
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#
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# When this is changed, you must run `ninja -t clean` to remove any files from
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# the previous target's build before building again.
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pw_target_config = "$dir_pigweed/targets/host/host.gni"
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}
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# Import variables that provide paths to modules. Pigweed's GN build requires
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# that this file is imported, and it MUST be imported before any other Pigweed
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# .gni files (as they depend on the dir_[module] variables).
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import("$dir_pigweed/modules.gni")
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# Import target configuration. This is what "completes" a Pigweed configuration.
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# This file should set a default toolchain, configure pw_executable, select
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# backends to build against, and provide target-specific build arguments.
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import(pw_target_config)
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# Ensure some sort of default toolchain was provided by the target, and then
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# set the default toolchain.
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assert(pw_target_toolchain != "",
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"Build target must provide its own toolchain.")
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set_default_toolchain(pw_target_toolchain)
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# Override the built-in build targets to add default compilation options.
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# TODO(pwbug/72): Move this code to a .gni file for easier reuse.
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template("_pw_override_target_with_defaults") {
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target(invoker._target_type, target_name) {
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forward_variables_from(invoker, "*", [ "_target_type" ])
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if (!defined(configs)) {
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configs = []
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}
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# Add default configs to use for all binary build targets.
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configs += [
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"$dir_pw_build:reduced_size",
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"$dir_pw_build:strict_warnings",
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]
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}
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}
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foreach(_target_type,
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[
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"source_set",
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"executable",
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"shared_library",
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"static_library",
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]) {
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template(_target_type) {
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_pw_override_target_with_defaults(target_name) {
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forward_variables_from(invoker, "*")
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}
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}
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}
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