@VisibleForTesting
 protected BuildTarget getExtensionTarget(BuildTarget target, Flavor platform) {
   return CxxDescriptionEnhancer.createSharedLibraryBuildTarget(target, platform);
 }
 @VisibleForTesting
 protected static BuildTarget getExtensionTarget(
     BuildTarget target, Flavor pythonPlatform, Flavor platform) {
   return CxxDescriptionEnhancer.createSharedLibraryBuildTarget(
       BuildTarget.builder(target).addFlavors(pythonPlatform).build(), platform);
 }