Implicit outputs to cc_library are also exported in unique output gro…

…ups.

--
MOS_MIGRATED_REVID=126405595

src/main/java/com/google/devtools/build/lib/rules/cpp/CcLibraryHelper.java

@@ -41,6 +41,7 @@
 import com.google.devtools.build.lib.rules.cpp.CppConfiguration.HeadersCheckingMode;
 import com.google.devtools.build.lib.rules.cpp.Link.LinkTargetType;
 import com.google.devtools.build.lib.rules.cpp.LinkerInputs.LibraryToLink;
+import com.google.devtools.build.lib.syntax.Type;
 import com.google.devtools.build.lib.util.FileTypeSet;
 import com.google.devtools.build.lib.util.Pair;
 import com.google.devtools.build.lib.util.Preconditions;
@@ -938,6 +939,11 @@ public Info build() {
         dwoArtifacts.getDwoArtifacts(), dwoArtifacts.getPicDwoArtifacts()));
     providers.put(TransitiveLipoInfoProvider.class, collectTransitiveLipoInfo(ccOutputs));
     Map<String, NestedSet<Artifact>> outputGroups = new TreeMap<>();
+
+    if (shouldAddLinkerOutputArtifacts(ruleContext, ccOutputs)) {
+      addLinkerOutputArtifacts(outputGroups);
+    }
+
     outputGroups.put(OutputGroupProvider.TEMP_FILES, getTemps(ccOutputs));
     if (emitCompileProviders) {
       boolean isLipoCollector =
@@ -973,6 +979,42 @@ public Info build() {
         cppCompilationContext);
   }
 
+  /**
+   * Returns true if the appropriate attributes for linker output artifacts are defined, and either
+   * the compile action produces object files or the build is configured to produce an archive or
+   * dynamic library even in the absense of object files.
+   */
+  private boolean shouldAddLinkerOutputArtifacts(
+      RuleContext ruleContext, CcCompilationOutputs ccOutputs) {
+    return (ruleContext.attributes().has("alwayslink", Type.BOOLEAN)
+        && ruleContext.attributes().has("linkstatic", Type.BOOLEAN)
+        && (emitLinkActionsIfEmpty || !ccOutputs.isEmpty()));
+  }
+
+  /**
+   * Adds linker output artifacts to the given map, to be registered on the configured target as
+   * output groups.
+   */
+  private void addLinkerOutputArtifacts(Map<String, NestedSet<Artifact>> outputGroups) {
+    NestedSetBuilder<Artifact> archiveFile = new NestedSetBuilder<>(Order.STABLE_ORDER);
+    NestedSetBuilder<Artifact> dynamicLibrary = new NestedSetBuilder<>(Order.STABLE_ORDER);
+
+    if (ruleContext.attributes().get("alwayslink", Type.BOOLEAN)) {
+      archiveFile.add(
+          CppHelper.getLinkedArtifact(ruleContext, Link.LinkTargetType.ALWAYS_LINK_STATIC_LIBRARY));
+    } else {
+      archiveFile.add(CppHelper.getLinkedArtifact(ruleContext, Link.LinkTargetType.STATIC_LIBRARY));
+    }
+
+    if (CppRuleClasses.shouldCreateDynamicLibrary(ruleContext.attributes())) {
+      dynamicLibrary.add(
+          CppHelper.getLinkedArtifact(ruleContext, Link.LinkTargetType.DYNAMIC_LIBRARY));
+    }
+
+    outputGroups.put("archive", archiveFile.build());
+    outputGroups.put("dynamic_library", dynamicLibrary.build());
+  }
+
   /**
    * Creates the C/C++ compilation action creator.
    */

src/main/java/com/google/devtools/build/lib/rules/cpp/CppRuleClasses.java

@@ -38,6 +38,7 @@
 import com.google.devtools.build.lib.packages.ImplicitOutputsFunction.SafeImplicitOutputsFunction;
 import com.google.devtools.build.lib.packages.Rule;
 import com.google.devtools.build.lib.rules.test.InstrumentedFilesCollector.InstrumentationSpec;
+import com.google.devtools.build.lib.syntax.Type;
 import com.google.devtools.build.lib.util.FileTypeSet;
 import com.google.devtools.build.lib.view.config.crosstool.CrosstoolConfig.LipoMode;
 
@@ -46,6 +47,11 @@
  */
 public class CppRuleClasses {
 
+  /** Returns true if this rule should create a dynamic library. */
+  public static boolean shouldCreateDynamicLibrary(AttributeMap rule) {
+    return !rule.get("linkstatic", Type.BOOLEAN) && CcLibrary.appearsToHaveObjectFiles(rule);
+  }
+
   /**
    * Implementation for the :lipo_context_collector attribute.
    */

src/test/java/com/google/devtools/build/lib/rules/cpp/CppOutputGroupsTest.java

@@ -0,0 +1,100 @@
+// 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.cpp;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import com.google.devtools.build.lib.actions.util.ActionsTestUtil;
+import com.google.devtools.build.lib.analysis.ConfiguredTarget;
+import com.google.devtools.build.lib.analysis.util.BuildViewTestCase;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+/** Tests the output groups of cc_library. */
+@RunWith(JUnit4.class)
+public class CppOutputGroupsTest extends BuildViewTestCase {
+
+  @Test
+  public void testStaticLibraryOnlyOutputGroups() throws Exception {
+    scratch.file("src.cc");
+    scratch.file(
+        "a/BUILD",
+        "cc_library(name='lib', srcs=['src.cc'], linkstatic=1, alwayslink=0)",
+        "filegroup(name='group_archive', srcs=[':lib'], output_group = 'archive')",
+        "filegroup(name='group_dynamic', srcs=[':lib'], output_group = 'dynamic_library')");
+
+    ConfiguredTarget groupArchive = getConfiguredTarget("//a:group_archive");
+    ConfiguredTarget groupDynamic = getConfiguredTarget("//a:group_dynamic");
+
+    assertThat(ActionsTestUtil.prettyArtifactNames(getFilesToBuild(groupArchive)))
+        .containsExactly("a/liblib.a");
+    assertThat(ActionsTestUtil.prettyArtifactNames(getFilesToBuild(groupDynamic))).isEmpty();
+  }
+
+  @Test
+  public void testSharedLibraryOnlyOutputGroups() throws Exception {
+    scratch.file("src.cc");
+    scratch.file(
+        "a/BUILD",
+        "cc_library(name='lib', srcs=['src.cc'], linkstatic=1, alwayslink=1)",
+        "filegroup(name='group_archive', srcs=[':lib'], output_group = 'archive')",
+        "filegroup(name='group_dynamic', srcs=[':lib'], output_group = 'dynamic_library')");
+
+    ConfiguredTarget groupArchive = getConfiguredTarget("//a:group_archive");
+    ConfiguredTarget groupDynamic = getConfiguredTarget("//a:group_dynamic");
+
+    assertThat(ActionsTestUtil.prettyArtifactNames(getFilesToBuild(groupArchive)))
+        .containsExactly("a/liblib.lo");
+    assertThat(ActionsTestUtil.prettyArtifactNames(getFilesToBuild(groupDynamic))).isEmpty();
+  }
+
+  @Test
+  public void testStaticAndDynamicLibraryOutputGroups() throws Exception {
+    scratch.file("src.cc");
+    scratch.file(
+        "a/BUILD",
+        "cc_library(name='lib', srcs=['src.cc'], linkstatic=0, alwayslink=0)",
+        "filegroup(name='group_archive', srcs=[':lib'], output_group = 'archive')",
+        "filegroup(name='group_dynamic', srcs=[':lib'], output_group = 'dynamic_library')");
+
+    ConfiguredTarget groupArchive = getConfiguredTarget("//a:group_archive");
+    ConfiguredTarget groupDynamic = getConfiguredTarget("//a:group_dynamic");
+
+    assertThat(ActionsTestUtil.prettyArtifactNames(getFilesToBuild(groupArchive)))
+        .containsExactly("a/liblib.a");
+    assertThat(ActionsTestUtil.prettyArtifactNames(getFilesToBuild(groupDynamic)))
+        .containsExactly("a/liblib.so");
+  }
+
+  @Test
+  public void testSharedAndDynamicLibraryOutputGroups() throws Exception {
+    scratch.file("src.cc");
+    scratch.file(
+        "a/BUILD",
+        "cc_library(name='lib', srcs=['src.cc'], linkstatic=0, alwayslink=1)",
+        "filegroup(name='group_archive', srcs=[':lib'], output_group = 'archive')",
+        "filegroup(name='group_dynamic', srcs=[':lib'], output_group = 'dynamic_library')");
+
+    ConfiguredTarget groupArchive = getConfiguredTarget("//a:group_archive");
+    ConfiguredTarget groupDynamic = getConfiguredTarget("//a:group_dynamic");
+
+    assertThat(ActionsTestUtil.prettyArtifactNames(getFilesToBuild(groupArchive)))
+        .containsExactly("a/liblib.lo");
+    assertThat(ActionsTestUtil.prettyArtifactNames(getFilesToBuild(groupDynamic)))
+        .containsExactly("a/liblib.so");
+  }
+}