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// Copyright 2016 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.objc;
import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.analysis.config.BuildConfiguration;
import com.google.devtools.build.lib.analysis.config.BuildOptions;
import com.google.devtools.build.lib.analysis.config.PatchTransition;
import com.google.devtools.build.lib.rules.apple.AppleCommandLineOptions;
import com.google.devtools.build.lib.rules.apple.AppleConfiguration.ConfigurationDistinguisher;
import com.google.devtools.build.lib.rules.cpp.CppOptions;
import com.google.devtools.build.lib.rules.objc.ObjcCommandLineOptions.ObjcCrosstoolMode;
/**
* Transition that produces a configuration that causes c++ toolchain selection to use the
* CROSSTOOL given in apple_crosstool_top.
*/
public class AppleCrosstoolTransition implements PatchTransition {
/**
* A singleton instance of AppleCrosstoolTransition.
*/
public static final PatchTransition APPLE_CROSSTOOL_TRANSITION = new AppleCrosstoolTransition();
@Override
public boolean defaultsToSelf() {
return true;
}
@Override
public BuildOptions apply(BuildOptions buildOptions) {
BuildOptions result = buildOptions.clone();
if (!shouldUseAppleCrosstoolTransition(buildOptions)) {
return buildOptions;
}
result.get(AppleCommandLineOptions.class).configurationDistinguisher =
ConfigurationDistinguisher.APPLE_CROSSTOOL;
// TODO(b/29355778): Once ios_cpu is retired, introduce another top-level flag (perhaps
// --apple_cpu) for toolchain selection in top-level consuming rules.
String cpu = String.format("%s_%s",
buildOptions.get(AppleCommandLineOptions.class).applePlatformType,
buildOptions.get(AppleCommandLineOptions.class).getSingleArchitecture());
setAppleCrosstoolTransitionConfiguration(buildOptions, result, cpu);
return result;
}
/**
* Sets configuration fields required for a transition that uses apple_crosstool_top in place of
* the default CROSSTOOL.
*
* @param from options from the originating configuration
* @param to options for the destination configuration. This instance will be modified
* to so the destination configuration uses the apple crosstool
* @param cpu {@code --cpu} value for toolchain selection in the destination configuration
*/
public static void setAppleCrosstoolTransitionConfiguration(BuildOptions from,
BuildOptions to, String cpu) {
to.get(BuildConfiguration.Options.class).cpu = cpu;
to.get(CppOptions.class).crosstoolTop =
from.get(AppleCommandLineOptions.class).appleCrosstoolTop;
// --compiler = "compiler" for all OSX toolchains. We do not support asan/tsan, cfi, etc. on
// darwin.
to.get(CppOptions.class).cppCompiler = "compiler";
// OSX toolchains always use the runtime of the platform they are targeting (i.e. we do not
// support custom production environments).
to.get(CppOptions.class).libcTop = null;
to.get(CppOptions.class).glibc = null;
// OSX toolchains do not support fission.
to.get(CppOptions.class).fissionModes = ImmutableList.of();
}
/**
* Returns true if the given options imply use of AppleCrosstoolTransition for all apple
* targets.
*/
public static boolean shouldUseAppleCrosstoolTransition(BuildOptions options) {
return (options.get(AppleCommandLineOptions.class).enableAppleCrosstoolTransition
|| options.get(ObjcCommandLineOptions.class).experimentalObjcLibrary
|| options.get(ObjcCommandLineOptions.class).objcCrosstoolMode != ObjcCrosstoolMode.OFF);
}
}
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