// 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.common.truth.Truth.assertThat;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.devtools.build.lib.analysis.ConfiguredTarget;
import com.google.devtools.build.lib.analysis.test.InstrumentedFilesInfo;
import com.google.devtools.build.lib.analysis.util.AnalysisMock;
import com.google.devtools.build.lib.analysis.util.BuildViewTestCase;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.packages.Provider;
import com.google.devtools.build.lib.packages.StarlarkProvider;
import com.google.devtools.build.lib.packages.StructImpl;
import com.google.devtools.build.lib.packages.util.Crosstool.CcToolchainConfig;
import com.google.devtools.build.lib.packages.util.MockCcSupport;
import com.google.devtools.build.lib.packages.util.ResourceLoader;
import com.google.devtools.build.lib.testutil.TestConstants;
import com.google.devtools.build.lib.util.Pair;
import net.starlark.java.eval.Dict;
import net.starlark.java.eval.Mutability;
import net.starlark.java.eval.Starlark;
import net.starlark.java.eval.StarlarkFunction;
import net.starlark.java.eval.StarlarkSemantics;
import net.starlark.java.eval.StarlarkThread;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/**
 * Unit tests for {@code CcToolchainProvider}
 */
@RunWith(JUnit4.class)
public class CcToolchainProviderTest extends BuildViewTestCase {
  @Test
  public void testStarlarkCallables() throws Exception {
    AnalysisMock.get()
        .ccSupport()
        .setupCcToolchainConfig(
            mockToolsConfig, CcToolchainConfig.builder().withFeatures(CppRuleClasses.SUPPORTS_PIC));
    useConfiguration("--force_pic", "--platforms=" + TestConstants.PLATFORM_LABEL);
    scratch.file(
        "test/rule.bzl",
        """
        MyInfo = provider()

        def _impl(ctx):
            provider = ctx.attr._cc_toolchain[cc_common.CcToolchainInfo]
            feature_configuration = cc_common.configure_features(
                ctx = ctx,
                cc_toolchain = provider,
            )
            return MyInfo(
                dirs = provider.built_in_include_directories,
                sysroot = provider.sysroot,
                cpu = provider.cpu,
                ar_executable = provider.ar_executable,
                use_pic_for_dynamic_libraries = provider.needs_pic_for_dynamic_libraries(
                    feature_configuration = feature_configuration,
                ),
            )

        my_rule = rule(
            _impl,
            attrs = {"_cc_toolchain": attr.label(default = Label("//test:toolchain"))},
            fragments = ["cpp"],
        )
        """);

    scratch.file(
        "test/BUILD",
        """
        load(":rule.bzl", "my_rule")

        cc_toolchain_alias(name = "toolchain")

        my_rule(name = "target")
        """);

    ConfiguredTarget ct = getConfiguredTarget("//test:target");
    Provider.Key key = new StarlarkProvider.Key(Label.parseCanonical("//test:rule.bzl"), "MyInfo");
    StructImpl info = (StructImpl) ct.get(key);

    assertThat((String) info.getValue("ar_executable")).endsWith("/usr/bin/mock-ar");

    assertThat(info.getValue("cpu")).isEqualTo("k8");

    assertThat(info.getValue("sysroot")).isEqualTo("/usr/grte/v1");

    boolean usePicForDynamicLibraries = (boolean) info.getValue("use_pic_for_dynamic_libraries");
    assertThat(usePicForDynamicLibraries).isTrue();
  }

  @Test
  public void testToolchainAndSuiteDifferentPackages() throws Exception {
    scratch.file("suite/BUILD", "filegroup(name = 'empty')");
    scratch.file(
        "toolchain/BUILD",
        """
        load(":cc_toolchain_config.bzl", "cc_toolchain_config")

        cc_toolchain(
            name = "toolchain",
            all_files = ":empty",
            ar_files = ":empty",
            as_files = ":empty",
            compiler_files = ":empty",
            dwp_files = ":empty",
            linker_files = ":empty",
            objcopy_files = ":empty",
            strip_files = ":empty",
            toolchain_config = ":banana_config",
            toolchain_identifier = "banana",
        )

        cc_toolchain_config(name = "banana_config")
        """);

    scratch.appendFile("tools/cpp/BUILD", "");
    scratch.overwriteFile(
        "tools/cpp/cc_toolchain_config_lib.bzl",
        ResourceLoader.readFromResources(
            TestConstants.RULES_CC_REPOSITORY_EXECROOT + "cc/cc_toolchain_config_lib.bzl"));
    scratch.file(
        "toolchain/cc_toolchain_config.bzl",
        """
        load("//tools/cpp:cc_toolchain_config_lib.bzl", "tool_path")

        def _impl(ctx):
            return cc_common.create_cc_toolchain_config_info(
                ctx = ctx,
                features = [],
                action_configs = [],
                artifact_name_patterns = [],
                cxx_builtin_include_directories = [],
                toolchain_identifier = "toolchain",
                host_system_name = "host",
                target_system_name = "target",
                target_cpu = "cpu",
                target_libc = "libc",
                compiler = "compiler",
                abi_libc_version = "abi_libc",
                abi_version = "banana",
                tool_paths = [
                    tool_path(name = "ar", path = "some/ar"),
                    tool_path(name = "cpp", path = "some/cpp"),
                    tool_path(name = "gcc", path = "some/gcc"),
                    tool_path(name = "gcov", path = "some/gcov"),
                    tool_path(name = "gcovtool", path = "some/gcovtool"),
                    tool_path(name = "ld", path = "some/ld"),
                    tool_path(name = "nm", path = "some/nm"),
                    tool_path(name = "objcopy", path = "some/objcopy"),
                    tool_path(name = "objdump", path = "some/objdump"),
                    tool_path(name = "strip", path = "some/strip"),
                    tool_path(name = "dwp", path = "some/dwp"),
                ],
                cc_target_os = "os",
                builtin_sysroot = "sysroot",
            )

        cc_toolchain_config = rule(
            implementation = _impl,
            attrs = {},
            provides = [CcToolchainConfigInfo],
            fragments = ["cpp"],
        )
        """);

    ConfiguredTarget target = getConfiguredTarget("//toolchain");
    CcToolchainProvider toolchainProvider = target.get(CcToolchainProvider.PROVIDER);

    assertThat(
            CcToolchainProvider.getToolPathString(
                toolchainProvider.getToolPaths(),
                CppConfiguration.Tool.CPP,
                toolchainProvider.getCcToolchainLabel(),
                toolchainProvider.getToolchainIdentifier()))
        .isEqualTo("toolchain/some/cpp");
  }

  private ImmutableMap<String, String> getMakeVariables(CcToolchainProvider ccToolchainProvider)
      throws Exception {
    StarlarkFunction getMakeVariables =
        (StarlarkFunction)
            getTestAnalysisEnvironment()
                .getStarlarkDefinedBuiltins()
                .get("get_toolchain_global_make_variables");
    try (Mutability mu = Mutability.create("test")) {
      StarlarkThread thread = StarlarkThread.createTransient(mu, StarlarkSemantics.DEFAULT);
      Dict<?, ?> makeVarsDict =
          (Dict<?, ?>)
              Starlark.call(
                  thread,
                  getMakeVariables,
                  ImmutableList.of(ccToolchainProvider.getValue()),
                  ImmutableMap.of());
      return ImmutableMap.copyOf(
          Dict.cast(makeVarsDict, String.class, String.class, "make_vars_for_test"));
    }
  }

  /*
   * Crosstools should load fine with or without 'gcov-tool'. Those that define 'gcov-tool'
   * should also add a make variable.
   */
  @Test
  public void testGcovToolNotDefined() throws Exception {
    // Crosstool with gcov-tool
    scratch.file(
        "a/BUILD",
        "load(':cc_toolchain_config.bzl', 'cc_toolchain_config')",
        "filegroup(",
        "   name='empty')",
        "cc_toolchain(",
        "    name = 'b',",
        "    all_files = ':empty',",
        "    ar_files = ':empty',",
        "    as_files = ':empty',",
        "    compiler_files = ':empty',",
        "    dwp_files = ':empty',",
        "    linker_files = ':empty',",
        "    strip_files = ':empty',",
        "    objcopy_files = ':empty',",
        "    toolchain_identifier = 'banana',",
        "    toolchain_config = ':k8-compiler_config',",
        ")",
        CcToolchainConfig.builder()
            .withToolPaths(
                Pair.of("gcc", "path-to-gcc-tool"),
                Pair.of("ar", "ar"),
                Pair.of("cpp", "cpp"),
                Pair.of("gcov", "gcov"),
                Pair.of("ld", "ld"),
                Pair.of("nm", "nm"),
                Pair.of("objdump", "objdump"),
                Pair.of("strip", "strip"))
            .build()
            .getCcToolchainConfigRule());
    analysisMock.ccSupport().setupCcToolchainConfig(mockToolsConfig, CcToolchainConfig.builder());
    mockToolsConfig.create(
        "a/cc_toolchain_config.bzl",
        ResourceLoader.readFromResources(
            "com/google/devtools/build/lib/analysis/mock/cc_toolchain_config.bzl"));
    CcToolchainProvider ccToolchainProvider =
        getConfiguredTarget("//a:b").get(CcToolchainProvider.PROVIDER);
    assertThat(getMakeVariables(ccToolchainProvider)).doesNotContainKey("GCOVTOOL");
  }

  @Test
  public void testGcovToolDefined() throws Exception {
    // Crosstool with gcov-tool
    scratch.file(
        "a/BUILD",
        "load(':cc_toolchain_config.bzl', 'cc_toolchain_config')",
        "filegroup(",
        "   name='empty')",
        "cc_toolchain(",
        "    name = 'b',",
        "    all_files = ':empty',",
        "    ar_files = ':empty',",
        "    as_files = ':empty',",
        "    compiler_files = ':empty',",
        "    dwp_files = ':empty',",
        "    linker_files = ':empty',",
        "    strip_files = ':empty',",
        "    objcopy_files = ':empty',",
        "    toolchain_identifier = 'banana',",
        "    toolchain_config = ':k8-compiler_config',",
        ")",
        CcToolchainConfig.builder()
            .withToolPaths(
                Pair.of("gcc", "path-to-gcc-tool"),
                Pair.of("gcov-tool", "path-to-gcov-tool"),
                Pair.of("ar", "ar"),
                Pair.of("cpp", "cpp"),
                Pair.of("gcov", "gcov"),
                Pair.of("ld", "ld"),
                Pair.of("nm", "nm"),
                Pair.of("objdump", "objdump"),
                Pair.of("strip", "strip"))
            .build()
            .getCcToolchainConfigRule());
    analysisMock.ccSupport().setupCcToolchainConfig(mockToolsConfig, CcToolchainConfig.builder());
    mockToolsConfig.create(
        "a/cc_toolchain_config.bzl",
        ResourceLoader.readFromResources(
            "com/google/devtools/build/lib/analysis/mock/cc_toolchain_config.bzl"));
    useConfiguration(
        "--platforms=" + TestConstants.PLATFORM_LABEL,
        "--host_platform=" + TestConstants.PLATFORM_LABEL);
    CcToolchainProvider ccToolchainProvider =
        getConfiguredTarget("//a:b").get(CcToolchainProvider.PROVIDER);
    assertThat(getMakeVariables(ccToolchainProvider)).containsKey("GCOVTOOL");
  }

  @Test
  public void testGcovNotDefined() throws Exception {
    CcToolchainConfig.Builder ccToolchainConfigBuilder =
        CcToolchainConfig.builder()
            .withToolPaths(
                Pair.of("gcc", "path-to-gcc-tool"),
                Pair.of("gcov-tool", "path-to-gcov-tool"),
                Pair.of("ar", "ar"),
                Pair.of("cpp", "cpp"),
                // No path for gcov
                Pair.of("ld", "ld"),
                Pair.of("nm", "nm"),
                Pair.of("objdump", "objdump"),
                Pair.of("strip", "strip"));
    scratch.file(
        "a/BUILD",
        "load(':cc_toolchain_config.bzl', 'cc_toolchain_config')",
        "filegroup(",
        "   name='empty')",
        "cc_toolchain(",
        "    name = 'b',",
        "    all_files = ':empty',",
        "    ar_files = ':empty',",
        "    as_files = ':empty',",
        "    compiler_files = ':empty',",
        "    dwp_files = ':empty',",
        "    linker_files = ':empty',",
        "    strip_files = ':empty',",
        "    objcopy_files = ':empty',",
        "    toolchain_identifier = 'banana',",
        "    toolchain_config = ':k8-compiler_config',",
        ")",
        ccToolchainConfigBuilder.build().getCcToolchainConfigRule(),
        "cc_library(",
        "    name = 'lib',",
        "    toolchains = [':b'],",
        ")");
    analysisMock.ccSupport().setupCcToolchainConfig(mockToolsConfig, ccToolchainConfigBuilder);
    mockToolsConfig.create(
        "a/cc_toolchain_config.bzl",
        ResourceLoader.readFromResources(
            "com/google/devtools/build/lib/analysis/mock/cc_toolchain_config.bzl"));
    useConfiguration("--collect_code_coverage", "--instrumentation_filter=//a[:/]");
    InstrumentedFilesInfo instrumentedFilesInfo =
        getConfiguredTarget("//a:lib").get(InstrumentedFilesInfo.STARLARK_CONSTRUCTOR);

    assertThat(instrumentedFilesInfo.getCoverageEnvironment())
        .containsEntry("COVERAGE_GCOV_PATH", "");
  }

  // regression test for b/319501294
  @Test
  public void testEmptyCoverageFilesDefaultsToAllFiles() throws Exception {
    CcToolchainConfig.Builder ccToolchainConfigBuilder = CcToolchainConfig.builder();
    scratch.file(
        "a/BUILD",
        "load(':cc_toolchain_config.bzl', 'cc_toolchain_config')",
        "filegroup(name='empty')",
        "filegroup(name='my_files', srcs = ['file1', 'file2'])",
        "cc_toolchain(",
        "    name = 'b',",
        "    all_files = ':my_files',",
        "    ar_files = ':empty',",
        "    as_files = ':empty',",
        "    compiler_files = ':empty',",
        "    dwp_files = ':empty',",
        "    linker_files = ':empty',",
        "    strip_files = ':empty',",
        "    objcopy_files = ':empty',",
        "    toolchain_identifier = 'banana',",
        "    toolchain_config = ':k8-compiler_config',",
        ")",
        ccToolchainConfigBuilder.build().getCcToolchainConfigRule(),
        "cc_library(",
        "    name = 'lib',",
        "    toolchains = [':b'],",
        ")");
    analysisMock.ccSupport().setupCcToolchainConfig(mockToolsConfig, ccToolchainConfigBuilder);
    mockToolsConfig.create(
        "a/cc_toolchain_config.bzl",
        ResourceLoader.readFromResources(
            "com/google/devtools/build/lib/analysis/mock/cc_toolchain_config.bzl"));

    CcToolchainProvider provider = getConfiguredTarget("//a:b").get(CcToolchainProvider.PROVIDER);

    assertThat(artifactsToStrings(provider.getCoverageFiles()))
        .containsExactly("src a/file1", "src a/file2");
  }

  @Test
  public void testLlvmCoverageToolsDefined() throws Exception {
    CcToolchainConfig.Builder ccToolchainConfigBuilder =
        CcToolchainConfig.builder()
            .withToolPaths(
                Pair.of("gcc", "path-to-gcc-tool"),
                Pair.of("gcov-tool", "path-to-gcov-tool"),
                Pair.of("ar", "ar"),
                Pair.of("cpp", "cpp"),
                Pair.of("ld", "ld"),
                Pair.of("llvm-cov", "path-to-llvm-cov"),
                Pair.of("llvm-profdata", "path-to-llvm-profdata"),
                Pair.of("nm", "nm"),
                Pair.of("objdump", "objdump"),
                Pair.of("strip", "strip"));
    scratch.file(
        "a/BUILD",
        "load(':cc_toolchain_config.bzl', 'cc_toolchain_config')",
        "filegroup(",
        "   name='empty')",
        "cc_toolchain(",
        "    name = 'b',",
        "    all_files = ':empty',",
        "    ar_files = ':empty',",
        "    as_files = ':empty',",
        "    compiler_files = ':empty',",
        "    dwp_files = ':empty',",
        "    linker_files = ':empty',",
        "    strip_files = ':empty',",
        "    objcopy_files = ':empty',",
        "    toolchain_identifier = 'banana',",
        "    toolchain_config = ':k8-compiler_config',",
        ")",
        ccToolchainConfigBuilder.build().getCcToolchainConfigRule(),
        "cc_library(",
        "    name = 'lib',",
        "    toolchains = [':b'],",
        ")");
    analysisMock.ccSupport().setupCcToolchainConfig(mockToolsConfig, ccToolchainConfigBuilder);
    mockToolsConfig.create(
        "a/cc_toolchain_config.bzl",
        ResourceLoader.readFromResources(
            "com/google/devtools/build/lib/analysis/mock/cc_toolchain_config.bzl"));
    useConfiguration("--collect_code_coverage", "--instrumentation_filter=//a[:/]");

    ImmutableMap<String, String> coverageEnv =
        getConfiguredTarget("//a:lib")
            .get(InstrumentedFilesInfo.STARLARK_CONSTRUCTOR)
            .getCoverageEnvironment();

    assertThat(coverageEnv).containsKey("LLVM_COV");
    assertThat(coverageEnv.get("LLVM_COV")).isNotEmpty();
    assertThat(coverageEnv).containsKey("LLVM_PROFDATA");
    assertThat(coverageEnv.get("LLVM_PROFDATA")).isNotEmpty();
  }

  @Test
  public void testLlvmCoverageToolsNotDefined() throws Exception {
    CcToolchainConfig.Builder ccToolchainConfigBuilder =
        CcToolchainConfig.builder()
            .withToolPaths(
                Pair.of("gcc", "path-to-gcc-tool"),
                Pair.of("gcov-tool", "path-to-gcov-tool"),
                Pair.of("ar", "ar"),
                Pair.of("cpp", "cpp"),
                // No paths for llvm-cov, llvm-profdata
                Pair.of("ld", "ld"),
                Pair.of("nm", "nm"),
                Pair.of("objdump", "objdump"),
                Pair.of("strip", "strip"));
    scratch.file(
        "a/BUILD",
        "load(':cc_toolchain_config.bzl', 'cc_toolchain_config')",
        "filegroup(",
        "   name='empty')",
        "cc_toolchain(",
        "    name = 'b',",
        "    all_files = ':empty',",
        "    ar_files = ':empty',",
        "    as_files = ':empty',",
        "    compiler_files = ':empty',",
        "    dwp_files = ':empty',",
        "    linker_files = ':empty',",
        "    strip_files = ':empty',",
        "    objcopy_files = ':empty',",
        "    toolchain_identifier = 'banana',",
        "    toolchain_config = ':k8-compiler_config',",
        ")",
        ccToolchainConfigBuilder.build().getCcToolchainConfigRule(),
        "cc_library(",
        "    name = 'lib',",
        "    toolchains = [':b'],",
        ")");
    analysisMock.ccSupport().setupCcToolchainConfig(mockToolsConfig, ccToolchainConfigBuilder);
    mockToolsConfig.create(
        "a/cc_toolchain_config.bzl",
        ResourceLoader.readFromResources(
            "com/google/devtools/build/lib/analysis/mock/cc_toolchain_config.bzl"));
    useConfiguration("--collect_code_coverage", "--instrumentation_filter=//a[:/]");

    ImmutableMap<String, String> coverageEnv =
        getConfiguredTarget("//a:lib")
            .get(InstrumentedFilesInfo.STARLARK_CONSTRUCTOR)
            .getCoverageEnvironment();

    assertThat(coverageEnv).containsAtLeast("LLVM_COV", "", "LLVM_PROFDATA", "");
  }

  @Test
  public void testEnableCoveragePropagatesSupportFiles() throws Exception {
    scratch.file(
        "a/BUILD",
        """
        cc_toolchain_alias(name = "toolchain")

        cc_library(
            name = "lib",
        )
        """);
    useConfiguration("--collect_code_coverage", "--instrumentation_filter=//a[:/]");

    CcToolchainProvider ccToolchainProvider =
        getConfiguredTarget("//a:toolchain").get(CcToolchainProvider.PROVIDER);
    InstrumentedFilesInfo instrumentedFilesInfo =
        getConfiguredTarget("//a:lib").get(InstrumentedFilesInfo.STARLARK_CONSTRUCTOR);

    assertThat(instrumentedFilesInfo.getCoverageSupportFiles().toList()).isNotEmpty();
    assertThat(instrumentedFilesInfo.getCoverageSupportFiles().toList())
        .containsExactlyElementsIn(ccToolchainProvider.getCoverageFiles().toList());
  }

  @Test
  public void testDisableCoverageDoesNotPropagateSupportFiles() throws Exception {
    scratch.file(
        "a/BUILD",
        """
        cc_toolchain_alias(name = "toolchain")

        cc_library(
            name = "lib",
        )
        """);

    InstrumentedFilesInfo instrumentedFilesInfo =
        getConfiguredTarget("//a:lib").get(InstrumentedFilesInfo.STARLARK_CONSTRUCTOR);

    assertThat(instrumentedFilesInfo.getCoverageSupportFiles().toList()).isEmpty();
  }

  @Test
  public void testConfigWithMissingToolDefs() throws Exception {
    scratch.file(
        "a/BUILD",
        "load(':cc_toolchain_config.bzl', 'cc_toolchain_config')",
        "filegroup(",
        "   name='empty')",
        "cc_toolchain(",
        "    name = 'b',",
        "    all_files = ':empty',",
        "    ar_files = ':empty',",
        "    as_files = ':empty',",
        "    compiler_files = ':empty',",
        "    dwp_files = ':empty',",
        "    linker_files = ':empty',",
        "    strip_files = ':empty',",
        "    objcopy_files = ':empty',",
        "    toolchain_identifier = 'banana',",
        "    toolchain_config = ':k8-compiler_config',",
        ")",
        CcToolchainConfig.builder()
            .withToolPaths(
                Pair.of("gcc", "path-to-gcc-tool"),
                Pair.of("ar", "ar"),
                Pair.of("cpp", "cpp"),
                Pair.of("gcov", "gcov"),
                Pair.of("ld", "ld"),
                Pair.of("nm", "nm"),
                Pair.of("objdump", "objdump")
                // Pair.of("strip", "strip")
                )
            .build()
            .getCcToolchainConfigRule());
    analysisMock.ccSupport().setupCcToolchainConfig(mockToolsConfig, CcToolchainConfig.builder());
    mockToolsConfig.create(
        "a/cc_toolchain_config.bzl",
        ResourceLoader.readFromResources(
            "com/google/devtools/build/lib/analysis/mock/cc_toolchain_config.bzl"));
    reporter.removeHandler(failFastHandler);
    getConfiguredTarget("//a:b");
    assertContainsEvent("Tool path for 'strip' is missing");
  }

  @Test
  public void testRuntimeLibsAttributesAreNotObligatory() throws Exception {
    scratch.file(
        "a/BUILD",
        """
        load(":cc_toolchain_config.bzl", "cc_toolchain_config")

        filegroup(name = "empty")

        cc_toolchain(
            name = "b",
            all_files = ":empty",
            ar_files = ":empty",
            as_files = ":empty",
            compiler_files = ":empty",
            dwp_files = ":empty",
            linker_files = ":empty",
            objcopy_files = ":empty",
            strip_files = ":empty",
            toolchain_config = ":banana_config",
            toolchain_identifier = "banana",
        )

        cc_toolchain_config(name = "banana_config")
        """);
    scratch.file("a/cc_toolchain_config.bzl", MockCcSupport.EMPTY_CC_TOOLCHAIN);
    analysisMock.ccSupport().setupCcToolchainConfig(mockToolsConfig, CcToolchainConfig.builder());
    reporter.removeHandler(failFastHandler);
    getConfiguredTarget("//a:b");
    assertNoEvents();
  }

  @Test
  public void testWhenStaticRuntimeLibAttributeMandatoryWhenSupportsEmbeddedRuntimes()
      throws Exception {
    scratch.file(
        "a/BUILD",
        "load(':cc_toolchain_config.bzl', 'cc_toolchain_config')",
        "filegroup(name = 'empty')",
        "cc_binary(name = 'main', srcs = [ 'main.cc' ],)",
        "cc_binary(name = 'test', linkstatic = 0, srcs = [ 'test.cc' ],)",
        "cc_toolchain(",
        "    name = 'b',",
        "    all_files = ':empty',",
        "    ar_files = ':empty',",
        "    as_files = ':empty',",
        "    compiler_files = ':empty',",
        "    dwp_files = ':empty',",
        "    linker_files = ':empty',",
        "    strip_files = ':empty',",
        "    objcopy_files = ':empty',",
        "    toolchain_identifier = 'banana',",
        "    toolchain_config = ':k8-compiler_config',",
        ")",
        CcToolchainConfig.builder()
            .withFeatures(CppRuleClasses.STATIC_LINK_CPP_RUNTIMES)
            .build()
            .getCcToolchainConfigRule(),
        "toolchain(",
        "  name = 'cc-toolchain-b',",
        "  toolchain_type = '" + TestConstants.TOOLS_REPOSITORY + "//tools/cpp:toolchain_type',",
        "  toolchain = ':b',",
        "  target_compatible_with = [],",
        "  exec_compatible_with = [],",
        ")");
    analysisMock.ccSupport().setupCcToolchainConfig(mockToolsConfig, CcToolchainConfig.builder());
    mockToolsConfig.create(
        "a/cc_toolchain_config.bzl",
        ResourceLoader.readFromResources(
            "com/google/devtools/build/lib/analysis/mock/cc_toolchain_config.bzl"));
    reporter.removeHandler(failFastHandler);
    useConfiguration(
        "--extra_toolchains=//a:cc-toolchain-b",
        "--platforms=" + TestConstants.PLATFORM_LABEL,
        "--host_platform=" + TestConstants.PLATFORM_LABEL);
    assertThat(getConfiguredTarget("//a:main")).isNull();
    assertContainsEvent(
        "Toolchain supports embedded runtimes, but didn't provide static_runtime_lib attribute.");
  }

  @Test
  public void testWhenDynamicRuntimeLibAttributeMandatoryWhenSupportsEmbeddedRuntimes()
      throws Exception {
    scratch.file(
        "a/BUILD",
        "load(':cc_toolchain_config.bzl', 'cc_toolchain_config')",
        "filegroup(name = 'empty')",
        "cc_binary(name = 'main', srcs = [ 'main.cc' ],)",
        "cc_binary(name = 'test', linkstatic = 0, srcs = [ 'test.cc' ],)",
        "cc_toolchain(",
        "    name = 'b',",
        "    all_files = ':empty',",
        "    ar_files = ':empty',",
        "    as_files = ':empty',",
        "    compiler_files = ':empty',",
        "    dwp_files = ':empty',",
        "    linker_files = ':empty',",
        "    strip_files = ':empty',",
        "    objcopy_files = ':empty',",
        "    static_runtime_lib = ':empty',",
        "    toolchain_identifier = 'banana',",
        "    toolchain_config = ':k8-compiler_config',",
        ")",
        CcToolchainConfig.builder()
            .withFeatures(
                CppRuleClasses.STATIC_LINK_CPP_RUNTIMES, CppRuleClasses.SUPPORTS_DYNAMIC_LINKER)
            .build()
            .getCcToolchainConfigRule(),
        "toolchain(",
        "  name = 'cc-toolchain-b',",
        "  toolchain_type = '" + TestConstants.TOOLS_REPOSITORY + "//tools/cpp:toolchain_type',",
        "  toolchain = ':b',",
        "  target_compatible_with = [],",
        "  exec_compatible_with = [],",
        ")");
    analysisMock.ccSupport().setupCcToolchainConfig(mockToolsConfig, CcToolchainConfig.builder());
    mockToolsConfig.create(
        "a/cc_toolchain_config.bzl",
        ResourceLoader.readFromResources(
            "com/google/devtools/build/lib/analysis/mock/cc_toolchain_config.bzl"));
    reporter.removeHandler(failFastHandler);
    useConfiguration(
        "--extra_toolchains=//a:cc-toolchain-b",
        "--platforms=" + TestConstants.PLATFORM_LABEL,
        "--host_platform=" + TestConstants.PLATFORM_LABEL,
        "--dynamic_mode=fully");
    assertThat(getConfiguredTarget("//a:test")).isNull();
    assertContainsEvent(
        "Toolchain supports embedded runtimes, but didn't provide dynamic_runtime_lib attribute.");
  }
}