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49 lines
2.0 KiB
49 lines
2.0 KiB
# 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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import("//build_overrides/pigweed.gni")
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import("$dir_pw_toolchain/generate_toolchain.gni")
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# Generates a toolchain using the currently active toolchain as a foundation.
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# WARNING: Only works with toolchains generated by Pigweed's generate_toolchain.
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# WARNING: This can quickly create an explosion of toolchains and compile times.
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# Use sparingly!
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#
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# Args:
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# build_args: (required) A scope setting GN build arg values to apply to GN
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# targets in this toolchain. These take precedence over args.gni settings,
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# and any build_args set by the currently active toolchain.
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# (other): You can optionally override all other generate_toolchain args. See
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# that template's documentation for more information.
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template("pw_generate_subtoolchain") {
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assert(defined(invoker.build_args), "Sub-toolchain is missing 'build_args'")
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_original_scope = pw_toolchain_SCOPE
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assert(defined(_original_scope.name),
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"Sub-toolchain must be generated from a Pigweed toolchain")
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generate_toolchain(target_name) {
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forward_variables_from(_original_scope, "*", [ "defaults" ])
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forward_variables_from(invoker, "*", [ "build_args" ])
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# Subtoolchains must always be generated from the toolchain that parses
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# them rather than relying on the default_toolchain.
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generate_from = current_toolchain
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defaults = {
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forward_variables_from(_original_scope.defaults, "*")
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forward_variables_from(invoker.build_args, "*")
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}
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}
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}
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