mirror of https://github.com/bazelbuild/rules_cc
73 lines
2.5 KiB
Python
73 lines
2.5 KiB
Python
# Copyright 2024 The Bazel Authors. All rights reserved.
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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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"""Implementation of the cc_feature_constraint rule."""
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load(
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"//cc/toolchains/impl:collect.bzl",
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"collect_features",
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"collect_provider",
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)
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load(
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":cc_toolchain_info.bzl",
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"FeatureConstraintInfo",
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"FeatureSetInfo",
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)
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def _cc_feature_constraint_impl(ctx):
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if ctx.attr.features:
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fail("Features is a reserved attribute in bazel. Use the attributes `all_of` and `none_of` for feature constraints")
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all_of = collect_provider(ctx.attr.all_of, FeatureConstraintInfo)
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none_of = [collect_features(ctx.attr.none_of)]
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none_of.extend([fc.none_of for fc in all_of])
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return [FeatureConstraintInfo(
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label = ctx.label,
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all_of = depset(transitive = [fc.all_of for fc in all_of]),
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none_of = depset(transitive = none_of),
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)]
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cc_feature_constraint = rule(
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implementation = _cc_feature_constraint_impl,
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attrs = {
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"all_of": attr.label_list(
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providers = [FeatureConstraintInfo],
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),
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"none_of": attr.label_list(
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providers = [FeatureSetInfo],
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),
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},
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provides = [FeatureConstraintInfo],
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doc = """Defines a compound relationship between features.
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This rule can be used with [`cc_args.require_any_of`](#cc_args-require_any_of) to specify that a set
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of arguments are only enabled when a constraint is met. Both `all_of` and `none_of` must be
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satisfied simultaneously.
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This is basically a `cc_feature_set` that supports `none_of` expressions. This extra flexibility
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is why this rule may only be used by [`cc_args.require_any_of`](#cc_args-require_any_of).
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Example:
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```
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load("//cc/toolchains:feature_constraint.bzl", "cc_feature_constraint")
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# A constraint that requires a `linker_supports_thinlto` feature to be enabled,
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# AND a `no_optimization` to be disabled.
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cc_feature_constraint(
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name = "thinlto_constraint",
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all_of = [":linker_supports_thinlto"],
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none_of = [":no_optimization"],
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)
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```
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""",
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)
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