Remove unnecessary '#ifdef __cplusplus' in *.cc files.

These files are already using C++ constructs, e.g. 'namespace', so
they're guaranteed to be compiled with a C++ compiler, not a C compiler.
It's only in the header files that '#ifdef __cplusplus' is needed.

PiperOrigin-RevId: 346804459
Change-Id: Ia49dc8e8f162a00f2dfbb77cf2fba84606f9dc1b

tensorflow/lite/c/c_api.cc

@@ -27,10 +27,6 @@ limitations under the License.
 #include "tensorflow/lite/model.h"
 #include "tensorflow/lite/version.h"
 
-#ifdef __cplusplus
-extern "C" {
-#endif  // __cplusplus
-
 namespace {
 class CallbackErrorReporter : public tflite::ErrorReporter {
  public:
@@ -85,6 +81,8 @@ class CallbackOpResolver : public ::tflite::OpResolver {
 
 }  // namespace
 
+extern "C" {
+
 // LINT.IfChange
 
 const char* TfLiteVersion() { return TFLITE_VERSION_STRING; }
@@ -233,9 +231,7 @@ TfLiteStatus TfLiteTensorCopyToBuffer(const TfLiteTensor* tensor,
 
 // LINT.ThenChange(//tensorflow/lite/experimental/examples/unity/TensorFlowLitePlugin/Assets/TensorFlowLite/SDK/Scripts/Interpreter.cs)
 
-#ifdef __cplusplus
 }  // extern "C"
-#endif  // __cplusplus
 
 namespace tflite {
 namespace internal {

tensorflow/lite/c/c_api_experimental.cc

@@ -24,9 +24,7 @@ limitations under the License.
 #include "tensorflow/lite/c/c_api_internal.h"
 #include "tensorflow/lite/interpreter.h"
 
-#ifdef __cplusplus
 extern "C" {
-#endif  // __cplusplus
 
 TfLiteStatus TfLiteInterpreterResetVariableTensors(
     TfLiteInterpreter* interpreter) {
@@ -82,6 +80,4 @@ void TfLiteInterpreterOptionsSetEnableDelegateFallback(
   options->enable_delegate_fallback = enable;
 }
 
-#ifdef __cplusplus
 }  // extern "C"
-#endif  // __cplusplus

tensorflow/lite/delegates/flex/java/src/main/native/flex_delegate_jni.cc

@@ -19,9 +19,7 @@ limitations under the License.
 #include "tensorflow/lite/delegates/utils/simple_delegate.h"
 #include "tensorflow/lite/testing/init_tensorflow.h"
 
-#ifdef __cplusplus
 extern "C" {
-#endif  // __cplusplus
 
 JNIEXPORT void JNICALL
 Java_org_tensorflow_lite_flex_FlexDelegate_nativeInitTensorFlow(JNIEnv* env,
@@ -42,6 +40,4 @@ Java_org_tensorflow_lite_flex_FlexDelegate_nativeDeleteDelegate(
       reinterpret_cast<struct TfLiteDelegate*>(delegate));
 }
 
-#ifdef __cplusplus
 }  // extern "C"
-#endif  // __cplusplus

tensorflow/lite/delegates/gpu/java/src/main/native/gpu_delegate_jni.cc

@@ -23,9 +23,7 @@ limitations under the License.
 #include "tensorflow/lite/experimental/acceleration/compatibility/android_info.h"
 #include "tensorflow/lite/experimental/acceleration/compatibility/gpu_compatibility.h"
 
-#ifdef __cplusplus
 extern "C" {
-#endif  // __cplusplus
 
 JNIEXPORT jlong JNICALL Java_org_tensorflow_lite_gpu_GpuDelegate_createDelegate(
     JNIEnv* env, jclass clazz, jboolean precision_loss_allowed,
@@ -113,6 +111,4 @@ Java_org_tensorflow_lite_gpu_CompatibilityList_deleteCompatibilityList(
   delete compatibility_list;
 }
 
-#ifdef __cplusplus
 }  // extern "C"
-#endif  // __cplusplus

tensorflow/lite/delegates/hexagon/java/src/main/native/hexagon_delegate_jni.cc

@@ -18,9 +18,7 @@ limitations under the License.
 
 #include "tensorflow/lite/delegates/hexagon/hexagon_delegate.h"
 
-#ifdef __cplusplus
 extern "C" {
-#endif
 
 JNIEXPORT jlong JNICALL
 Java_org_tensorflow_lite_HexagonDelegate_createDelegate(
@@ -51,6 +49,4 @@ Java_org_tensorflow_lite_HexagonDelegate_setAdspLibraryPath(
              : JNI_FALSE;
 }
 
-#ifdef __cplusplus
 }  // extern "C"
-#endif  // __cplusplus

tensorflow/lite/delegates/nnapi/java/src/main/native/nnapi_delegate_jni.cc

@@ -17,12 +17,10 @@ limitations under the License.
 
 #include "tensorflow/lite/delegates/nnapi/nnapi_delegate.h"
 
-#ifdef __cplusplus
-extern "C" {
-#endif  // __cplusplus
-
 using namespace tflite;
 
+extern "C" {
+
 JNIEXPORT jlong JNICALL
 Java_org_tensorflow_lite_nnapi_NnApiDelegate_createDelegate(
     JNIEnv* env, jclass clazz, jint preference, jstring accelerator_name,
@@ -87,6 +85,4 @@ Java_org_tensorflow_lite_nnapi_NnApiDelegate_deleteDelegate(JNIEnv* env,
   delete reinterpret_cast<StatefulNnApiDelegate*>(delegate);
 }
 
-#ifdef __cplusplus
 }  // extern "C"
-#endif  // __cplusplus

tensorflow/lite/delegates/utils/dummy_delegate/external_delegate_adaptor.cc

@@ -84,9 +84,7 @@ TfLiteDelegate* CreateDummyDelegateFromOptions(char** options_keys,
 }  // namespace tools
 }  // namespace tflite
 
-#ifdef __cplusplus
 extern "C" {
-#endif  // __cplusplus
 
 // Defines two symbols that need to be exported to use the TFLite external
 // delegate. See tensorflow/lite/delegates/external for details.
@@ -101,6 +99,4 @@ TFL_CAPI_EXPORT void tflite_plugin_destroy_delegate(TfLiteDelegate* delegate) {
   TfLiteDummyDelegateDelete(delegate);
 }
 
-#ifdef __cplusplus
-}
-#endif  // __cplusplus
+}  // extern "C"

tensorflow/lite/java/src/main/native/nativeinterpreterwrapper_jni.cc

@@ -157,9 +157,7 @@ bool VerifyModel(const void* buf, size_t len) {
 
 }  // namespace
 
-#ifdef __cplusplus
 extern "C" {
-#endif
 
 JNIEXPORT jobjectArray JNICALL
 Java_org_tensorflow_lite_NativeInterpreterWrapper_getInputNames(JNIEnv* env,
@@ -646,6 +644,4 @@ JNIEXPORT void JNICALL Java_org_tensorflow_lite_NativeInterpreterWrapper_delete(
   }
 }
 
-#ifdef __cplusplus
 }  // extern "C"
-#endif

tensorflow/lite/java/src/main/native/tensor_jni.cc

@@ -392,9 +392,7 @@ void WriteScalarString(JNIEnv* env, jobject src, TfLiteTensor* tensor) {
 
 }  // namespace
 
-#ifdef __cplusplus
 extern "C" {
-#endif  // __cplusplus
 
 JNIEXPORT jlong JNICALL Java_org_tensorflow_lite_Tensor_create(
     JNIEnv* env, jclass clazz, jlong interpreter_handle, jint tensor_index) {
@@ -615,6 +613,4 @@ JNIEXPORT jint JNICALL Java_org_tensorflow_lite_Tensor_quantizationZeroPoint(
   return static_cast<jint>(tensor ? tensor->params.zero_point : 0);
 }
 
-#ifdef __cplusplus
 }  // extern "C"
-#endif  // __cplusplus

tensorflow/lite/java/src/test/native/interpreter_test_jni.cc

@@ -20,9 +20,7 @@ limitations under the License.
 #include "tensorflow/lite/c/common.h"
 #include "tensorflow/lite/kernels/kernel_util.h"
 
-#ifdef __cplusplus
 extern "C" {
-#endif
 
 JNIEXPORT jlong JNICALL
 Java_org_tensorflow_lite_InterpreterTest_getNativeHandleForDelegate(
@@ -97,6 +95,4 @@ Java_org_tensorflow_lite_InterpreterTest_getNativeHandleForInvalidDelegate(
   return reinterpret_cast<jlong>(&delegate);
 }
 
-#ifdef __cplusplus
 }  // extern "C"
-#endif  // __cplusplus

tensorflow/lite/tools/benchmark/android/jni/benchmark_model_jni.cc

@@ -62,9 +62,7 @@ void Run(int argc, char** argv) {
 }  // namespace benchmark
 }  // namespace tflite
 
-#ifdef __cplusplus
 extern "C" {
-#endif
 
 JNIEXPORT void JNICALL
 Java_org_tensorflow_lite_benchmark_BenchmarkModel_nativeRun(JNIEnv* env,
@@ -90,6 +88,4 @@ Java_org_tensorflow_lite_benchmark_BenchmarkModel_nativeRun(JNIEnv* env,
   env->ReleaseStringUTFChars(args_obj, args_chars);
 }
 
-#ifdef __cplusplus
 }  // extern "C"
-#endif  // __cplusplus

tensorflow/lite/tools/benchmark/experimental/c/benchmark_c_api.cc

@@ -18,9 +18,7 @@ limitations under the License.
 #include "tensorflow/core/util/stats_calculator.h"
 #include "tensorflow/lite/tools/benchmark/benchmark_tflite_model.h"
 
-#ifdef __cplusplus
 extern "C" {
-#endif  // __cplusplus
 
 // -----------------------------------------------------------------------------
 // C APIs corresponding to tflite::benchmark::BenchmarkResults type.
@@ -179,6 +177,4 @@ void TfLiteBenchmarkTfLiteModelAddListener(
   return benchmark_model->benchmark_model->AddListener(listener->adapter.get());
 }
 
-#ifdef __cplusplus
-}
-#endif  // __cplusplus
+}  // extern "C"

tensorflow/lite/tools/benchmark/experimental/firebase/android/jni/benchmark_model_jni.cc

@@ -247,9 +247,7 @@ void RunScenario(const string& library_dir, int scenario, int report_fd) {
 }  // namespace benchmark
 }  // namespace tflite
 
-#ifdef __cplusplus
 extern "C" {
-#endif
 
 JNIEXPORT void JNICALL
 Java_org_tensorflow_lite_benchmark_firebase_BenchmarkModel_nativeRun(
@@ -263,6 +261,4 @@ Java_org_tensorflow_lite_benchmark_firebase_BenchmarkModel_nativeRun(
   env->ReleaseStringUTFChars(library_dir, lib_dir);
 }
 
-#ifdef __cplusplus
 }  // extern "C"
-#endif  // __cplusplus