Examples with RuleConfiguredTargetBuilder com.google.devtools.build.lib.analysis.RuleConfiguredTargetBuilder used on opensource projects

Example 1 with RuleConfiguredTargetBuilder

use of com.google.devtools.build.lib.analysis.RuleConfiguredTargetBuilder in project bazel by bazelbuild.

the class ShBinary method create.

@Override
public ConfiguredTarget create(RuleContext ruleContext) throws RuleErrorException {
    ImmutableList<Artifact> srcs = ruleContext.getPrerequisiteArtifacts("srcs", Mode.TARGET).list();
    if (srcs.size() != 1) {
        ruleContext.attributeError("srcs", "you must specify exactly one file in 'srcs'");
        return null;
    }
    Artifact symlink = ruleContext.createOutputArtifact();
    // Note that src is used as the executable script too
    Artifact src = srcs.get(0);
    // The interpretation of this deceptively simple yet incredibly generic rule is complicated
    // by the distinction between targets and (not properly encapsulated) artifacts. It depends
    // on the notion of other rule's "files-to-build" sets, which are undocumented, making it
    // impossible to give a precise definition of what this rule does in all cases (e.g. what
    // happens when srcs = ['x', 'y'] but 'x' is an empty filegroup?). This is a pervasive
    // problem in Blaze.
    ruleContext.registerAction(new ExecutableSymlinkAction(ruleContext.getActionOwner(), src, symlink));
    NestedSet<Artifact> filesToBuild = NestedSetBuilder.<Artifact>stableOrder().add(src).add(symlink).build();
    Runfiles runfiles = new Runfiles.Builder(ruleContext.getWorkspaceName(), ruleContext.getConfiguration().legacyExternalRunfiles()).addTransitiveArtifacts(filesToBuild).addRunfiles(ruleContext, RunfilesProvider.DEFAULT_RUNFILES).build();
    RunfilesSupport runfilesSupport = RunfilesSupport.withExecutable(ruleContext, runfiles, symlink);
    return new RuleConfiguredTargetBuilder(ruleContext).setFilesToBuild(filesToBuild).setRunfilesSupport(runfilesSupport, symlink).addProvider(RunfilesProvider.class, RunfilesProvider.simple(runfiles)).build();
}

Example 2 with RuleConfiguredTargetBuilder

use of com.google.devtools.build.lib.analysis.RuleConfiguredTargetBuilder in project bazel by bazelbuild.

the class ShLibrary method create.

@Override
public ConfiguredTarget create(RuleContext ruleContext) throws RuleErrorException {
    NestedSet<Artifact> filesToBuild = NestedSetBuilder.<Artifact>stableOrder().addAll(ruleContext.getPrerequisiteArtifacts("srcs", Mode.TARGET).list()).addAll(ruleContext.getPrerequisiteArtifacts("deps", Mode.TARGET).list()).addAll(ruleContext.getPrerequisiteArtifacts("data", Mode.DATA).list()).build();
    Runfiles runfiles = new Runfiles.Builder(ruleContext.getWorkspaceName(), ruleContext.getConfiguration().legacyExternalRunfiles()).addTransitiveArtifacts(filesToBuild).build();
    return new RuleConfiguredTargetBuilder(ruleContext).setFilesToBuild(filesToBuild).addProvider(RunfilesProvider.class, RunfilesProvider.simple(runfiles)).build();
}

Example 3 with RuleConfiguredTargetBuilder

use of com.google.devtools.build.lib.analysis.RuleConfiguredTargetBuilder in project bazel by bazelbuild.

the class CcBinary method init.

public static ConfiguredTarget init(CppSemantics semantics, RuleContext ruleContext, boolean fake) throws InterruptedException, RuleErrorException {
    ruleContext.checkSrcsSamePackage(true);
    CcCommon common = new CcCommon(ruleContext);
    CcToolchainProvider ccToolchain = common.getToolchain();
    FdoSupportProvider fdoSupport = common.getFdoSupport();
    FeatureConfiguration featureConfiguration = CcCommon.configureFeatures(ruleContext, ccToolchain);
    CppConfiguration cppConfiguration = ruleContext.getFragment(CppConfiguration.class);
    PrecompiledFiles precompiledFiles = new PrecompiledFiles(ruleContext);
    LinkTargetType linkType = isLinkShared(ruleContext) ? LinkTargetType.DYNAMIC_LIBRARY : LinkTargetType.EXECUTABLE;
    semantics.validateAttributes(ruleContext);
    if (ruleContext.hasErrors()) {
        return null;
    }
    List<String> linkopts = common.getLinkopts();
    LinkStaticness linkStaticness = getLinkStaticness(ruleContext, linkopts, cppConfiguration);
    // We currently only want link the dynamic library generated for test code separately.
    boolean linkCompileOutputSeparately = ruleContext.isTestTarget() && cppConfiguration.getLinkCompileOutputSeparately() && linkStaticness == LinkStaticness.DYNAMIC;
    CcLibraryHelper helper = new CcLibraryHelper(ruleContext, semantics, featureConfiguration, ccToolchain, fdoSupport).fromCommon(common).addSources(common.getSources()).addDeps(ImmutableList.of(CppHelper.mallocForTarget(ruleContext))).setFake(fake).addPrecompiledFiles(precompiledFiles).enableInterfaceSharedObjects();
    // When linking the object files directly into the resulting binary, we do not need
    // library-level link outputs; thus, we do not let CcLibraryHelper produce link outputs
    // (either shared object files or archives) for a non-library link type [*], and add
    // the object files explicitly in determineLinkerArguments.
    //
    // When linking the object files into their own library, we want CcLibraryHelper to
    // take care of creating the library link outputs for us, so we need to set the link
    // type to STATIC_LIBRARY.
    //
    // [*] The only library link type is STATIC_LIBRARY. EXECUTABLE specifies a normal
    // cc_binary output, while DYNAMIC_LIBRARY is a cc_binary rules that produces an
    // output matching a shared object, for example cc_binary(name="foo.so", ...) on linux.
    helper.setLinkType(linkCompileOutputSeparately ? LinkTargetType.STATIC_LIBRARY : linkType);
    CcLibraryHelper.Info info = helper.build();
    CppCompilationContext cppCompilationContext = info.getCppCompilationContext();
    CcCompilationOutputs ccCompilationOutputs = info.getCcCompilationOutputs();
    // if cc_binary includes "linkshared=1", then gcc will be invoked with
    // linkopt "-shared", which causes the result of linking to be a shared
    // library. In this case, the name of the executable target should end
    // in ".so" or "dylib" or ".dll".
    PathFragment binaryPath = new PathFragment(ruleContext.getTarget().getName());
    if (!isLinkShared(ruleContext)) {
        binaryPath = new PathFragment(binaryPath.getPathString() + OsUtils.executableExtension());
    }
    Artifact binary = ruleContext.getBinArtifact(binaryPath);
    if (isLinkShared(ruleContext) && !CppFileTypes.SHARED_LIBRARY.matches(binary.getFilename()) && !CppFileTypes.VERSIONED_SHARED_LIBRARY.matches(binary.getFilename())) {
        ruleContext.attributeError("linkshared", "'linkshared' used in non-shared library");
        return null;
    }
    CppLinkActionBuilder linkActionBuilder = determineLinkerArguments(ruleContext, ccToolchain, fdoSupport, common, precompiledFiles, info, cppCompilationContext.getTransitiveCompilationPrerequisites(), fake, binary, linkStaticness, linkopts, linkCompileOutputSeparately);
    linkActionBuilder.setUseTestOnlyFlags(ruleContext.isTestTarget());
    if (linkStaticness == LinkStaticness.DYNAMIC) {
        linkActionBuilder.setRuntimeInputs(ArtifactCategory.DYNAMIC_LIBRARY, ccToolchain.getDynamicRuntimeLinkMiddleman(), ccToolchain.getDynamicRuntimeLinkInputs());
    } else {
        linkActionBuilder.setRuntimeInputs(ArtifactCategory.STATIC_LIBRARY, ccToolchain.getStaticRuntimeLinkMiddleman(), ccToolchain.getStaticRuntimeLinkInputs());
        // TODO(bazel-team): Move this to CcToolchain.
        if (!ccToolchain.getStaticRuntimeLinkInputs().isEmpty()) {
            linkActionBuilder.addLinkopt("-static-libgcc");
        }
    }
    linkActionBuilder.setLinkType(linkType);
    linkActionBuilder.setLinkStaticness(linkStaticness);
    linkActionBuilder.setFake(fake);
    linkActionBuilder.setFeatureConfiguration(featureConfiguration);
    if (CppLinkAction.enableSymbolsCounts(cppConfiguration, fake, linkType)) {
        linkActionBuilder.setSymbolCountsOutput(ruleContext.getBinArtifact(CppLinkAction.symbolCountsFileName(binaryPath)));
    }
    if (isLinkShared(ruleContext)) {
        linkActionBuilder.setLibraryIdentifier(CcLinkingOutputs.libraryIdentifierOf(binary));
    }
    // Store immutable context for use in other *_binary rules that are implemented by
    // linking the interpreter (Java, Python, etc.) together with native deps.
    CppLinkAction.Context linkContext = new CppLinkAction.Context(linkActionBuilder);
    Iterable<LTOBackendArtifacts> ltoBackendArtifacts = ImmutableList.of();
    boolean usePic = CppHelper.usePic(ruleContext, !isLinkShared(ruleContext));
    if (featureConfiguration.isEnabled(CppRuleClasses.THIN_LTO)) {
        linkActionBuilder.setLTOIndexing(true);
        linkActionBuilder.setUsePicForLTOBackendActions(usePic);
        linkActionBuilder.setUseFissionForLTOBackendActions(cppConfiguration.useFission());
        CppLinkAction indexAction = linkActionBuilder.build();
        ruleContext.registerAction(indexAction);
        ltoBackendArtifacts = indexAction.getAllLTOBackendArtifacts();
        linkActionBuilder.setLTOIndexing(false);
    }
    CppLinkAction linkAction = linkActionBuilder.build();
    ruleContext.registerAction(linkAction);
    LibraryToLink outputLibrary = linkAction.getOutputLibrary();
    Iterable<Artifact> fakeLinkerInputs = fake ? linkAction.getInputs() : ImmutableList.<Artifact>of();
    Artifact executable = linkAction.getLinkOutput();
    CcLinkingOutputs.Builder linkingOutputsBuilder = new CcLinkingOutputs.Builder();
    if (isLinkShared(ruleContext)) {
        linkingOutputsBuilder.addDynamicLibrary(outputLibrary);
        linkingOutputsBuilder.addExecutionDynamicLibrary(outputLibrary);
    }
    // Also add all shared libraries from srcs.
    for (Artifact library : precompiledFiles.getSharedLibraries()) {
        Artifact symlink = common.getDynamicLibrarySymlink(library, true);
        LibraryToLink symlinkLibrary = LinkerInputs.solibLibraryToLink(symlink, library, CcLinkingOutputs.libraryIdentifierOf(library));
        linkingOutputsBuilder.addDynamicLibrary(symlinkLibrary);
        linkingOutputsBuilder.addExecutionDynamicLibrary(symlinkLibrary);
    }
    CcLinkingOutputs linkingOutputs = linkingOutputsBuilder.build();
    NestedSet<Artifact> filesToBuild = NestedSetBuilder.create(Order.STABLE_ORDER, executable);
    // Create the stripped binary, but don't add it to filesToBuild; it's only built when requested.
    Artifact strippedFile = ruleContext.getImplicitOutputArtifact(CppRuleClasses.CC_BINARY_STRIPPED);
    CppHelper.createStripAction(ruleContext, ccToolchain, cppConfiguration, executable, strippedFile);
    DwoArtifactsCollector dwoArtifacts = collectTransitiveDwoArtifacts(ruleContext, ccCompilationOutputs, linkStaticness, cppConfiguration.useFission(), usePic, ltoBackendArtifacts);
    Artifact dwpFile = ruleContext.getImplicitOutputArtifact(CppRuleClasses.CC_BINARY_DEBUG_PACKAGE);
    createDebugPackagerActions(ruleContext, ccToolchain, cppConfiguration, dwpFile, dwoArtifacts);
    // The debug package should include the dwp file only if it was explicitly requested.
    Artifact explicitDwpFile = dwpFile;
    if (!cppConfiguration.useFission()) {
        explicitDwpFile = null;
    } else {
        // built statically.
        if (TargetUtils.isTestRule(ruleContext.getRule()) && linkStaticness != LinkStaticness.DYNAMIC && cppConfiguration.shouldBuildTestDwp()) {
            filesToBuild = NestedSetBuilder.fromNestedSet(filesToBuild).add(dwpFile).build();
        }
    }
    // TODO(bazel-team): Do we need to put original shared libraries (along with
    // mangled symlinks) into the RunfilesSupport object? It does not seem
    // logical since all symlinked libraries will be linked anyway and would
    // not require manual loading but if we do, then we would need to collect
    // their names and use a different constructor below.
    Runfiles runfiles = collectRunfiles(ruleContext, ccToolchain, linkingOutputs, info, linkStaticness, filesToBuild, fakeLinkerInputs, fake, helper.getCompilationUnitSources(), linkCompileOutputSeparately);
    RunfilesSupport runfilesSupport = RunfilesSupport.withExecutable(ruleContext, runfiles, executable, ruleContext.getConfiguration().buildRunfiles());
    TransitiveLipoInfoProvider transitiveLipoInfo;
    if (cppConfiguration.isLipoContextCollector()) {
        transitiveLipoInfo = common.collectTransitiveLipoLabels(ccCompilationOutputs);
    } else {
        transitiveLipoInfo = TransitiveLipoInfoProvider.EMPTY;
    }
    RuleConfiguredTargetBuilder ruleBuilder = new RuleConfiguredTargetBuilder(ruleContext);
    addTransitiveInfoProviders(ruleContext, cppConfiguration, common, ruleBuilder, filesToBuild, ccCompilationOutputs, cppCompilationContext, linkingOutputs, dwoArtifacts, transitiveLipoInfo, fake);
    Map<Artifact, IncludeScannable> scannableMap = new LinkedHashMap<>();
    Map<PathFragment, Artifact> sourceFileMap = new LinkedHashMap<>();
    if (cppConfiguration.isLipoContextCollector()) {
        for (IncludeScannable scannable : transitiveLipoInfo.getTransitiveIncludeScannables()) {
            // These should all be CppCompileActions, which should have only one source file.
            // This is also checked when they are put into the nested set.
            Artifact source = Iterables.getOnlyElement(scannable.getIncludeScannerSources());
            scannableMap.put(source, scannable);
            sourceFileMap.put(source.getExecPath(), source);
        }
    }
    // Support test execution on darwin.
    if (Platform.isApplePlatform(cppConfiguration.getTargetCpu()) && TargetUtils.isTestRule(ruleContext.getRule())) {
        ruleBuilder.addNativeDeclaredProvider(new ExecutionInfoProvider(ImmutableMap.of(ExecutionRequirements.REQUIRES_DARWIN, "")));
    }
    return ruleBuilder.addProvider(RunfilesProvider.class, RunfilesProvider.simple(runfiles)).addProvider(CppDebugPackageProvider.class, new CppDebugPackageProvider(ruleContext.getLabel(), strippedFile, executable, explicitDwpFile)).setRunfilesSupport(runfilesSupport, executable).addProvider(LipoContextProvider.class, new LipoContextProvider(cppCompilationContext, ImmutableMap.copyOf(scannableMap), ImmutableMap.copyOf(sourceFileMap))).addProvider(CppLinkAction.Context.class, linkContext).addSkylarkTransitiveInfo(CcSkylarkApiProvider.NAME, new CcSkylarkApiProvider()).build();
}

Example 4 with RuleConfiguredTargetBuilder

use of com.google.devtools.build.lib.analysis.RuleConfiguredTargetBuilder in project bazel by bazelbuild.

the class CcIncLibrary method create.

@Override
public ConfiguredTarget create(final RuleContext ruleContext) throws RuleErrorException, InterruptedException {
    CcToolchainProvider ccToolchain = CppHelper.getToolchain(ruleContext, ":cc_toolchain");
    FeatureConfiguration featureConfiguration = CcCommon.configureFeatures(ruleContext, ccToolchain);
    PathFragment packageFragment = ruleContext.getPackageDirectory();
    // The rule needs a unique location for the include directory, which doesn't conflict with any
    // other rule. For that reason, the include directory is at:
    // configuration/package_name/_/target_name
    // And then the symlink is placed at:
    // configuration/package_name/_/target_name/package_name
    // So that these inclusions can be resolved correctly:
    // #include "package_name/a.h"
    //
    // The target of the symlink is:
    // package_name/targetPrefix/
    // All declared header files must be below that directory.
    String expandedIncSymlinkAttr = ruleContext.attributes().get("prefix", Type.STRING);
    // We use an additional "_" directory here to avoid conflicts between this and previous Blaze
    // versions. Previous Blaze versions created a directory symlink; the new version does not
    // detect that the output directory isn't a directory, and tries to put the symlinks into what
    // is actually a symlink into the source tree.
    PathFragment includeDirectory = new PathFragment("_").getRelative(ruleContext.getTarget().getName());
    Root configIncludeDirectory = ruleContext.getConfiguration().getIncludeDirectory(ruleContext.getRule().getRepository());
    PathFragment includePath = configIncludeDirectory.getExecPath().getRelative(packageFragment).getRelative(includeDirectory);
    Path includeRoot = configIncludeDirectory.getPath().getRelative(packageFragment).getRelative(includeDirectory);
    // For every source artifact, we compute a virtual artifact that is below the include directory.
    // These are used for include checking.
    PathFragment prefixFragment = packageFragment.getRelative(expandedIncSymlinkAttr);
    if (!prefixFragment.isNormalized()) {
        ruleContext.attributeWarning("prefix", "should not contain '.' or '..' elements");
    }
    ImmutableSortedMap.Builder<Artifact, Artifact> virtualArtifactMapBuilder = ImmutableSortedMap.orderedBy(Artifact.EXEC_PATH_COMPARATOR);
    prefixFragment = prefixFragment.normalize();
    ImmutableList<Artifact> hdrs = ruleContext.getPrerequisiteArtifacts("hdrs", Mode.TARGET).list();
    for (Artifact src : hdrs) {
        // All declared header files must start with package/targetPrefix.
        if (!src.getRootRelativePath().startsWith(prefixFragment)) {
            ruleContext.attributeError("hdrs", src + " does not start with '" + prefixFragment.getPathString() + "'");
            return null;
        }
        // Remove the targetPrefix from within the exec path of the source file, and prepend the
        // unique directory prefix, e.g.:
        // third_party/foo/1.2/bar/a.h -> third_party/foo/name/third_party/foo/bar/a.h
        PathFragment suffix = src.getRootRelativePath().relativeTo(prefixFragment);
        PathFragment virtualPath = includeDirectory.getRelative(packageFragment).getRelative(suffix);
        // These virtual artifacts have the symlink action as generating action.
        Artifact virtualArtifact = ruleContext.getPackageRelativeArtifact(virtualPath, configIncludeDirectory);
        virtualArtifactMapBuilder.put(virtualArtifact, src);
    }
    ImmutableSortedMap<Artifact, Artifact> virtualArtifactMap = virtualArtifactMapBuilder.build();
    ruleContext.registerAction(new CreateIncSymlinkAction(ruleContext.getActionOwner(), virtualArtifactMap, includeRoot));
    FdoSupportProvider fdoSupport = CppHelper.getFdoSupport(ruleContext, ":cc_toolchain");
    CcLibraryHelper.Info info = new CcLibraryHelper(ruleContext, semantics, featureConfiguration, ccToolchain, fdoSupport).addIncludeDirs(Arrays.asList(includePath)).addPublicHeaders(virtualArtifactMap.keySet()).addDeps(ruleContext.getPrerequisites("deps", Mode.TARGET)).build();
    // cc_inc_library doesn't compile any file - no compilation outputs available.
    InstrumentedFilesProvider instrumentedFilesProvider = new CcCommon(ruleContext).getInstrumentedFilesProvider(new ArrayList<Artifact>(), /*withBaselineCoverage=*/
    true);
    return new RuleConfiguredTargetBuilder(ruleContext).addProviders(info.getProviders()).addSkylarkTransitiveInfo(CcSkylarkApiProvider.NAME, new CcSkylarkApiProvider()).addOutputGroups(info.getOutputGroups()).add(InstrumentedFilesProvider.class, instrumentedFilesProvider).add(RunfilesProvider.class, RunfilesProvider.simple(Runfiles.EMPTY)).build();
}

Example 5 with RuleConfiguredTargetBuilder

use of com.google.devtools.build.lib.analysis.RuleConfiguredTargetBuilder in project bazel by bazelbuild.

the class CcToolchain method create.

@Override
public ConfiguredTarget create(RuleContext ruleContext) throws RuleErrorException, InterruptedException {
    TransitiveInfoCollection lipoContextCollector = ruleContext.getPrerequisite(":lipo_context_collector", Mode.DONT_CHECK);
    if (lipoContextCollector != null && lipoContextCollector.getProvider(LipoContextProvider.class) == null) {
        ruleContext.ruleError("--lipo_context must point to a cc_binary or a cc_test rule");
        return null;
    }
    CppConfiguration cppConfiguration = Preconditions.checkNotNull(ruleContext.getFragment(CppConfiguration.class));
    Path fdoZip = ruleContext.getConfiguration().getCompilationMode() == CompilationMode.OPT ? cppConfiguration.getFdoZip() : null;
    SkyKey fdoKey = FdoSupportValue.key(cppConfiguration.getLipoMode(), fdoZip, cppConfiguration.getFdoInstrument());
    SkyFunction.Environment skyframeEnv = ruleContext.getAnalysisEnvironment().getSkyframeEnv();
    FdoSupportValue fdoSupport;
    try {
        fdoSupport = (FdoSupportValue) skyframeEnv.getValueOrThrow(fdoKey, FdoException.class, IOException.class);
    } catch (FdoException | IOException e) {
        ruleContext.ruleError("cannot initialize FDO: " + e.getMessage());
        return null;
    }
    if (skyframeEnv.valuesMissing()) {
        return null;
    }
    final Label label = ruleContext.getLabel();
    final NestedSet<Artifact> crosstool = ruleContext.getPrerequisite("all_files", Mode.HOST).getProvider(FileProvider.class).getFilesToBuild();
    final NestedSet<Artifact> crosstoolMiddleman = getFiles(ruleContext, "all_files");
    final NestedSet<Artifact> compile = getFiles(ruleContext, "compiler_files");
    final NestedSet<Artifact> strip = getFiles(ruleContext, "strip_files");
    final NestedSet<Artifact> objcopy = getFiles(ruleContext, "objcopy_files");
    final NestedSet<Artifact> link = getFiles(ruleContext, "linker_files");
    final NestedSet<Artifact> dwp = getFiles(ruleContext, "dwp_files");
    final NestedSet<Artifact> libcLink = inputsForLibc(ruleContext);
    String purposePrefix = Actions.escapeLabel(label) + "_";
    String runtimeSolibDirBase = "_solib_" + "_" + Actions.escapeLabel(label);
    final PathFragment runtimeSolibDir = ruleContext.getConfiguration().getBinFragment().getRelative(runtimeSolibDirBase);
    // Static runtime inputs.
    TransitiveInfoCollection staticRuntimeLibDep = selectDep(ruleContext, "static_runtime_libs", cppConfiguration.getStaticRuntimeLibsLabel());
    final NestedSet<Artifact> staticRuntimeLinkInputs;
    final Artifact staticRuntimeLinkMiddleman;
    if (cppConfiguration.supportsEmbeddedRuntimes()) {
        staticRuntimeLinkInputs = staticRuntimeLibDep.getProvider(FileProvider.class).getFilesToBuild();
    } else {
        staticRuntimeLinkInputs = NestedSetBuilder.emptySet(Order.STABLE_ORDER);
    }
    if (!staticRuntimeLinkInputs.isEmpty()) {
        NestedSet<Artifact> staticRuntimeLinkMiddlemanSet = CompilationHelper.getAggregatingMiddleman(ruleContext, purposePrefix + "static_runtime_link", staticRuntimeLibDep);
        staticRuntimeLinkMiddleman = staticRuntimeLinkMiddlemanSet.isEmpty() ? null : Iterables.getOnlyElement(staticRuntimeLinkMiddlemanSet);
    } else {
        staticRuntimeLinkMiddleman = null;
    }
    Preconditions.checkState((staticRuntimeLinkMiddleman == null) == staticRuntimeLinkInputs.isEmpty());
    // Dynamic runtime inputs.
    TransitiveInfoCollection dynamicRuntimeLibDep = selectDep(ruleContext, "dynamic_runtime_libs", cppConfiguration.getDynamicRuntimeLibsLabel());
    NestedSet<Artifact> dynamicRuntimeLinkSymlinks;
    List<Artifact> dynamicRuntimeLinkInputs = new ArrayList<>();
    Artifact dynamicRuntimeLinkMiddleman;
    if (cppConfiguration.supportsEmbeddedRuntimes()) {
        NestedSetBuilder<Artifact> dynamicRuntimeLinkSymlinksBuilder = NestedSetBuilder.stableOrder();
        for (Artifact artifact : dynamicRuntimeLibDep.getProvider(FileProvider.class).getFilesToBuild()) {
            if (CppHelper.SHARED_LIBRARY_FILETYPES.matches(artifact.getFilename())) {
                dynamicRuntimeLinkInputs.add(artifact);
                dynamicRuntimeLinkSymlinksBuilder.add(SolibSymlinkAction.getCppRuntimeSymlink(ruleContext, artifact, runtimeSolibDirBase, ruleContext.getConfiguration()));
            }
        }
        dynamicRuntimeLinkSymlinks = dynamicRuntimeLinkSymlinksBuilder.build();
    } else {
        dynamicRuntimeLinkSymlinks = NestedSetBuilder.emptySet(Order.STABLE_ORDER);
    }
    if (!dynamicRuntimeLinkInputs.isEmpty()) {
        List<Artifact> dynamicRuntimeLinkMiddlemanSet = CppHelper.getAggregatingMiddlemanForCppRuntimes(ruleContext, purposePrefix + "dynamic_runtime_link", dynamicRuntimeLinkInputs, runtimeSolibDirBase, ruleContext.getConfiguration());
        dynamicRuntimeLinkMiddleman = dynamicRuntimeLinkMiddlemanSet.isEmpty() ? null : Iterables.getOnlyElement(dynamicRuntimeLinkMiddlemanSet);
    } else {
        dynamicRuntimeLinkMiddleman = null;
    }
    Preconditions.checkState((dynamicRuntimeLinkMiddleman == null) == dynamicRuntimeLinkSymlinks.isEmpty());
    CppCompilationContext.Builder contextBuilder = new CppCompilationContext.Builder(ruleContext);
    CppModuleMap moduleMap = createCrosstoolModuleMap(ruleContext);
    if (moduleMap != null) {
        contextBuilder.setCppModuleMap(moduleMap);
    }
    final CppCompilationContext context = contextBuilder.build();
    boolean supportsParamFiles = ruleContext.attributes().get("supports_param_files", BOOLEAN);
    boolean supportsHeaderParsing = ruleContext.attributes().get("supports_header_parsing", BOOLEAN);
    NestedSetBuilder<Pair<String, String>> coverageEnvironment = NestedSetBuilder.compileOrder();
    coverageEnvironment.add(Pair.of("COVERAGE_GCOV_PATH", cppConfiguration.getGcovExecutable().getPathString()));
    if (cppConfiguration.getFdoInstrument() != null) {
        coverageEnvironment.add(Pair.of("FDO_DIR", cppConfiguration.getFdoInstrument().getPathString()));
    }
    CcToolchainProvider provider = new CcToolchainProvider(cppConfiguration, crosstool, fullInputsForCrosstool(ruleContext, crosstoolMiddleman), compile, strip, objcopy, fullInputsForLink(ruleContext, link), ruleContext.getPrerequisiteArtifact("$interface_library_builder", Mode.HOST), dwp, libcLink, staticRuntimeLinkInputs, staticRuntimeLinkMiddleman, dynamicRuntimeLinkSymlinks, dynamicRuntimeLinkMiddleman, runtimeSolibDir, context, supportsParamFiles, supportsHeaderParsing, getBuildVariables(ruleContext), getBuiltinIncludes(ruleContext), coverageEnvironment.build(), ruleContext.getPrerequisiteArtifact("$link_dynamic_library_tool", Mode.HOST), getEnvironment(ruleContext));
    RuleConfiguredTargetBuilder builder = new RuleConfiguredTargetBuilder(ruleContext).add(CcToolchainProvider.class, provider).add(FdoSupportProvider.class, fdoSupport.getFdoSupport().createFdoSupportProvider(ruleContext)).setFilesToBuild(new NestedSetBuilder<Artifact>(Order.STABLE_ORDER).build()).add(RunfilesProvider.class, RunfilesProvider.simple(Runfiles.EMPTY));
    // If output_license is specified on the cc_toolchain rule, override the transitive licenses
    // with that one. This is necessary because cc_toolchain is used in the target configuration,
    // but it is sort-of-kind-of a tool, but various parts of it are linked into the output...
    // ...so we trust the judgment of the author of the cc_toolchain rule to figure out what
    // licenses should be propagated to C++ targets.
    // TODO(elenairina): Remove this and use Attribute.Builder.useOutputLicenses() on the
    // :cc_toolchain attribute instead.
    final License outputLicense = ruleContext.getRule().getToolOutputLicense(ruleContext.attributes());
    if (outputLicense != null && outputLicense != License.NO_LICENSE) {
        final NestedSet<TargetLicense> license = NestedSetBuilder.create(Order.STABLE_ORDER, new TargetLicense(ruleContext.getLabel(), outputLicense));
        LicensesProvider licensesProvider = new LicensesProvider() {

            @Override
            public NestedSet<TargetLicense> getTransitiveLicenses() {
                return license;
            }

            @Override
            public TargetLicense getOutputLicenses() {
                return new TargetLicense(label, outputLicense);
            }

            @Override
            public boolean hasOutputLicenses() {
                return true;
            }
        };
        builder.add(LicensesProvider.class, licensesProvider);
    }
    return builder.build();
}