63 lines
2.1 KiB
Python
63 lines
2.1 KiB
Python
# Copyright (C) 2023 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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FEATURES_ATTR_KEY = "features"
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LTO_FEATURE = "android_thin_lto"
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CLI_FEATURES_KEY = "//command_line_option:features"
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# This propagates LTO enablement down the dependency tree for modules that
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# enable it explicitly
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# TODO(b/270418352): Move this logic to the incoming transition when incoming
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# transitions support select statements
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def lto_deps_transition_impl(settings, attr):
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features = getattr(attr, FEATURES_ATTR_KEY)
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new_cli_features = list(settings[CLI_FEATURES_KEY])
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if LTO_FEATURE in features and LTO_FEATURE not in new_cli_features:
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new_cli_features.append(LTO_FEATURE)
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return {
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CLI_FEATURES_KEY: new_cli_features,
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}
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lto_deps_transition = transition(
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implementation = lto_deps_transition_impl,
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inputs = [
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CLI_FEATURES_KEY,
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],
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outputs = [
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CLI_FEATURES_KEY,
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],
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)
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# This un-propagates LTO enablement for shared deps, as LTO should only
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# propagate down static deps. This approach avoids an error where we end up with
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# two config variants of the same dependency
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def apply_drop_lto(old_cli_features):
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new_cli_features = list(old_cli_features)
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if LTO_FEATURE in old_cli_features:
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new_cli_features.remove(LTO_FEATURE)
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return {
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CLI_FEATURES_KEY: new_cli_features,
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}
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def drop_lto_transition_impl(settings, _):
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return apply_drop_lto(settings[CLI_FEATURES_KEY])
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drop_lto_transition = transition(
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implementation = drop_lto_transition_impl,
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inputs = [CLI_FEATURES_KEY],
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outputs = [CLI_FEATURES_KEY],
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)
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