Add flag to disable automatic xcodeproj generation.

RELNOTES: Removed .xcodeproj automatic output from objc rules. It can still be generated by requesting it explicitly on the command line.

--
PiperOrigin-RevId: 147202001
MOS_MIGRATED_REVID=147202001

src/main/java/com/google/devtools/build/lib/rules/objc/ObjcCommandLineOptions.java

@@ -214,6 +214,15 @@ public class ObjcCommandLineOptions extends FragmentOptions {
   )
   public boolean deviceDebugEntitlements;
 
+  @Option(
+      name = "deprecated_generate_xcode_project",
+      defaultValue = "true",
+      category = "flags",
+      help =
+          "If set, will generate xcode project for targets that support this. Will be removed soon."
+  )
+  public boolean generateXcodeProject;
+
   /**
    * Specifies the circumstances under which a CROSSTOOL is used for objc in this configuration.
    */

src/main/java/com/google/devtools/build/lib/rules/objc/ObjcConfiguration.java

@@ -82,6 +82,7 @@ public class ObjcConfiguration extends BuildConfiguration.Fragment {
   private final HeaderDiscovery.DotdPruningMode dotdPruningPlan;
   private final boolean experimentalHeaderThinning;
   private final Label objcHeaderScannerTool;
+  private final boolean generateXcodeProject;
 
   ObjcConfiguration(ObjcCommandLineOptions objcOptions, BuildConfiguration.Options options,
       @Nullable BlazeDirectories directories) {
@@ -122,6 +123,7 @@ public class ObjcConfiguration extends BuildConfiguration.Fragment {
             : HeaderDiscovery.DotdPruningMode.DO_NOT_USE;
     this.experimentalHeaderThinning = objcOptions.experimentalObjcHeaderThinning;
     this.objcHeaderScannerTool = objcOptions.objcHeaderScannerTool;
+    this.generateXcodeProject = objcOptions.generateXcodeProject;
   }
 
   /**
@@ -355,4 +357,11 @@ public boolean useExperimentalHeaderThinning() {
   public Label getObjcHeaderScannerTool() {
     return objcHeaderScannerTool;
   }
+
+  /**
+   * Returns {@code true} if an xcodegen project should be added to a target's files to build.
+   */
+  public boolean generateXcodeProject() {
+    return this.generateXcodeProject;
+  }
 }

src/main/java/com/google/devtools/build/lib/rules/objc/XcodeSupport.java

@@ -87,7 +87,10 @@ public XcodeSupport(
    */
   XcodeSupport addFilesToBuild(NestedSetBuilder<Artifact> filesToBuild)
       throws InterruptedException {
-    filesToBuild.add(ruleContext.getImplicitOutputArtifact(PBXPROJ));
+    if (ObjcRuleClasses.objcConfiguration(ruleContext).generateXcodeProject()) {
+      filesToBuild.add(ruleContext.getImplicitOutputArtifact(PBXPROJ));
+    }
+
     return this;
   }