1 files changed, 75 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/rules/objc/ObjcCppSemantics.java b/src/main/java/com/google/devtools/build/lib/rules/objc/ObjcCppSemantics.java
new file mode 100644
index 0000000000..b36523b181
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/rules/objc/ObjcCppSemantics.java
@@ -0,0 +1,75 @@
+// 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.devtools.build.lib.actions.Artifact;
+import com.google.devtools.build.lib.actions.Root;
+import com.google.devtools.build.lib.analysis.RuleContext;
+import com.google.devtools.build.lib.rules.cpp.CppCompilationContext.Builder;
+import com.google.devtools.build.lib.rules.cpp.CppCompileActionBuilder;
+import com.google.devtools.build.lib.rules.cpp.CppCompileActionContext;
+import com.google.devtools.build.lib.rules.cpp.CppConfiguration;
+import com.google.devtools.build.lib.rules.cpp.CppConfiguration.HeadersCheckingMode;
+import com.google.devtools.build.lib.rules.cpp.CppHelper;
+import com.google.devtools.build.lib.rules.cpp.CppSemantics;
+import com.google.devtools.build.lib.vfs.PathFragment;
+
+/**
+ * CppSemantics for objc builds.
+ */
+public class ObjcCppSemantics implements CppSemantics {
+
+  // We make CppSemantics a singleton object for efficiency and consistency, since we expect
+  // any instance to be identical.
+  public static final CppSemantics INSTANCE = new ObjcCppSemantics();
+
+  @Override
+  public PathFragment getEffectiveSourcePath(Artifact source) {
+    return source.getRootRelativePath();
+  }
+
+  @Override
+  public void finalizeCompileActionBuilder(
+      RuleContext ruleContext, CppCompileActionBuilder actionBuilder) {
+    actionBuilder.setCppConfiguration(ruleContext.getFragment(CppConfiguration.class));
+    actionBuilder.setActionContext(CppCompileActionContext.class);
+    // Because Bazel does not support include scanning, we need the entire crosstool filegroup,
+    // including header files, as opposed to just the "compile" filegroup.
+    actionBuilder.addTransitiveMandatoryInputs(CppHelper.getToolchain(ruleContext).getCrosstool());
+    actionBuilder.setShouldScanIncludes(false);
+  }
+
+  @Override
+  public void setupCompilationContext(RuleContext ruleContext, Builder contextBuilder) {
+    // For objc builds, no extra setup is required.
+  }
+
+  @Override
+  public HeadersCheckingMode determineHeadersCheckingMode(RuleContext ruleContext) {
+    // Currently, objc builds do not enforce strict deps.  To begin enforcing strict deps in objc,
+    // switch this flag to STRICT.
+    return HeadersCheckingMode.WARN;
+  }
+
+  @Override
+  public boolean needsIncludeScanning(RuleContext ruleContext) {
+    return false;
+  }
+
+  @Override
+  public Root getGreppedIncludesDirectory(RuleContext ruleContext) {
+    return null;
+  }
+}