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CcHostToolchainAliasRule.java
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CcHostToolchainAliasRule.java
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// Copyright 2017 The Bazel Authors. All rights reserved.
//
// 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
//
// http://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.
package com.google.devtools.build.lib.rules.cpp;
import static com.google.devtools.build.lib.packages.Attribute.attr;
import static com.google.devtools.build.lib.packages.BuildType.LABEL;
import com.google.devtools.build.lib.actions.MutableActionGraph.ActionConflictException;
import com.google.devtools.build.lib.analysis.BaseRuleClasses;
import com.google.devtools.build.lib.analysis.ConfiguredTarget;
import com.google.devtools.build.lib.analysis.RuleConfiguredTargetBuilder;
import com.google.devtools.build.lib.analysis.RuleConfiguredTargetFactory;
import com.google.devtools.build.lib.analysis.RuleContext;
import com.google.devtools.build.lib.analysis.RuleDefinition;
import com.google.devtools.build.lib.analysis.RuleDefinitionEnvironment;
import com.google.devtools.build.lib.analysis.Runfiles;
import com.google.devtools.build.lib.analysis.RunfilesProvider;
import com.google.devtools.build.lib.analysis.TemplateVariableInfo;
import com.google.devtools.build.lib.analysis.TransitiveInfoCollection;
import com.google.devtools.build.lib.analysis.config.ExecutionTransitionFactory;
import com.google.devtools.build.lib.analysis.platform.ToolchainInfo;
import com.google.devtools.build.lib.packages.RuleClass;
import javax.annotation.Nullable;
/** Implementation of the {@code cc_toolchain_alias} rule. */
public class CcHostToolchainAliasRule implements RuleDefinition {
@Override
public RuleClass build(RuleClass.Builder builder, RuleDefinitionEnvironment env) {
return builder
.requiresConfigurationFragments(CppConfiguration.class)
.removeAttribute("licenses")
.removeAttribute("distribs")
.add(
attr("$cc_toolchain_alias", LABEL)
.cfg(ExecutionTransitionFactory.create())
.value(env.getToolsLabel("//tools/cpp:current_cc_toolchain")))
.build();
}
@Override
public Metadata getMetadata() {
return Metadata.builder()
.name("cc_host_toolchain_alias")
.ancestors(BaseRuleClasses.NativeBuildRule.class)
.factoryClass(CcHostToolchainAlias.class)
.build();
}
/** Implementation of cc_host_toolchain_alias. */
public static class CcHostToolchainAlias implements RuleConfiguredTargetFactory {
@Override
@Nullable
public ConfiguredTarget create(RuleContext ruleContext)
throws InterruptedException, RuleErrorException, ActionConflictException {
TransitiveInfoCollection ccToolchainAlias =
ruleContext.getPrerequisite("$cc_toolchain_alias");
CcToolchainProvider ccToolchainProvider = ccToolchainAlias.get(CcToolchainProvider.PROVIDER);
TemplateVariableInfo templateVariableInfo =
ccToolchainAlias.get(TemplateVariableInfo.PROVIDER);
ToolchainInfo toolchain = ccToolchainAlias.get(ToolchainInfo.PROVIDER);
return new RuleConfiguredTargetBuilder(ruleContext)
.addProvider(RunfilesProvider.simple(ruleContext, Runfiles.EMPTY))
.addNativeDeclaredProvider(ccToolchainProvider)
.addNativeDeclaredProvider(toolchain)
.addNativeDeclaredProvider(templateVariableInfo)
.setFilesToBuild(ccToolchainProvider.getAllFilesIncludingLibc())
.build();
}
}
}