com.google.devtools.build.lib.bazel.rules.android.ndkcrosstools.r15.AndroidNdkCrosstoolsR15.java Source code

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Here is the source code for com.google.devtools.build.lib.bazel.rules.android.ndkcrosstools.r15.AndroidNdkCrosstoolsR15.java

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// Copyright 2018 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.bazel.rules.android.ndkcrosstools.r15;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.devtools.build.lib.bazel.rules.android.ndkcrosstools.NdkPaths;
import com.google.devtools.build.lib.bazel.rules.android.ndkcrosstools.StlImpl;
import com.google.devtools.build.lib.view.config.crosstool.CrosstoolConfig.CToolchain;
import com.google.devtools.build.lib.view.config.crosstool.CrosstoolConfig.CrosstoolRelease;
import com.google.devtools.build.lib.view.config.crosstool.CrosstoolConfig.DefaultCpuToolchain;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

/** Generates a CrosstoolRelease proto for the Android NDK. */
final class AndroidNdkCrosstoolsR15 {

    /**
     * Creates a CrosstoolRelease proto for the Android NDK, given the API level to use and the
     * release revision. The crosstools are generated through code rather than checked in as a flat
     * file to reduce the amount of templating needed (for parameters like the release name and
     * certain paths), to reduce duplication, and to make it easier to support future versions of the
     * NDK. TODO(bazel-team): Eventually we should move this into Skylark so the crosstools can be
     * updated independently of Bazel itself.
     *
     * @return A CrosstoolRelease for the Android NDK.
     */
    static CrosstoolRelease create(NdkPaths ndkPaths, StlImpl stlImpl, String hostPlatform, String clangVersion) {
        return CrosstoolRelease.newBuilder().setMajorVersion("android").setMinorVersion("")
                .setDefaultTargetCpu("armeabi")
                .addAllDefaultToolchain(getDefaultCpuToolchains(stlImpl, clangVersion))
                .addAllToolchain(createToolchains(ndkPaths, stlImpl, hostPlatform, clangVersion)).build();
    }

    private static ImmutableList<CToolchain> createToolchains(NdkPaths ndkPaths, StlImpl stlImpl,
            String hostPlatform, String clangVersion) {

        List<CToolchain.Builder> toolchainBuilders = new ArrayList<>();
        toolchainBuilders.addAll(new ArmCrosstools(ndkPaths, stlImpl, clangVersion).createCrosstools());
        toolchainBuilders.addAll(new MipsCrosstools(ndkPaths, stlImpl, clangVersion).createCrosstools());
        toolchainBuilders.addAll(new X86Crosstools(ndkPaths, stlImpl, clangVersion).createCrosstools());

        ImmutableList.Builder<CToolchain> toolchains = new ImmutableList.Builder<>();

        // Set attributes common to all toolchains.
        for (CToolchain.Builder toolchainBuilder : toolchainBuilders) {
            toolchainBuilder.setHostSystemName(hostPlatform).setTargetLibc("local")
                    .setAbiVersion(toolchainBuilder.getTargetCpu()).setAbiLibcVersion("local");

            // builtin_sysroot is set individually on each toolchain.
            // platforms/arch sysroot
            toolchainBuilder.addCxxBuiltinIncludeDirectory("%sysroot%/usr/include");
            // unified headers sysroot, from ndk15 and up
            toolchainBuilder.addCxxBuiltinIncludeDirectory(ndkPaths.createBuiltinSysroot() + "/usr/include");
            toolchainBuilder.addUnfilteredCxxFlag(
                    "-isystem%ndk%/usr/include".replace("%ndk%", ndkPaths.createBuiltinSysroot()));

            toolchains.add(toolchainBuilder.build());
        }

        return toolchains.build();
    }

    private static ImmutableList<DefaultCpuToolchain> getDefaultCpuToolchains(StlImpl stlImpl,
            String clangVersion) {
        // TODO(bazel-team): It would be better to auto-generate this somehow.

        ImmutableMap<String, String> defaultCpus = ImmutableMap.<String, String>builder()
                // arm
                .put("armeabi", "arm-linux-androideabi-clang" + clangVersion)
                .put("armeabi-v7a", "arm-linux-androideabi-clang" + clangVersion + "-v7a")
                .put("arm64-v8a", "aarch64-linux-android-clang" + clangVersion)

                // mips
                .put("mips", "mipsel-linux-android-clang" + clangVersion)
                .put("mips64", "mips64el-linux-android-clang" + clangVersion)

                // x86
                .put("x86", "x86-clang" + clangVersion).put("x86_64", "x86_64-clang" + clangVersion).build();

        ImmutableList.Builder<DefaultCpuToolchain> defaultCpuToolchains = ImmutableList.builder();
        for (Map.Entry<String, String> defaultCpu : defaultCpus.entrySet()) {
            defaultCpuToolchains.add(DefaultCpuToolchain.newBuilder().setCpu(defaultCpu.getKey())
                    .setToolchainIdentifier(defaultCpu.getValue() + "-" + stlImpl.getName()).build());
        }
        return defaultCpuToolchains.build();
    }
}