Deprecate legacy C API

src/bindings/c/include/c_api/ie_c_api.h

@@ -33,21 +33,37 @@
 #    define INFERENCE_ENGINE_C_API_EXTERN
 #endif
 
+#define IE_1_0_DEPRECATED                                                                                    \
+    OPENVINO_DEPRECATED("The Inference Engine API is deprecated and will be removed in the 2024.0 release. " \
+                        "For instructions on transitioning to the new API, please refer to "                 \
+                        "https://docs.openvino.ai/latest/openvino_2_0_transition_guide.html")
+
+#if !defined(IN_OV_COMPONENT) && !defined(C_API_LEGACY_HEADER_INCLUDED)
+#    define C_API_LEGACY_HEADER_INCLUDED
+#    ifdef _MSC_VER
+#        pragma message(
+            "The legacy C API is deprecated and will be removed in the 2024.0 release. For instructions on transitioning to the new API, please refer to https://docs.openvino.ai/latest/openvino_2_0_transition_guide.html")
+#    else
+#        warning("The legacy C API is deprecated and will be removed in the 2024.0 release. For instructions on transitioning to the new API, please refer to https://docs.openvino.ai/latest/openvino_2_0_transition_guide.html")
+#    endif
+#endif
+
 #if defined(OPENVINO_STATIC_LIBRARY) || defined(__GNUC__) && (__GNUC__ < 4)
-#    define INFERENCE_ENGINE_C_API(...) INFERENCE_ENGINE_C_API_EXTERN __VA_ARGS__
+#    define INFERENCE_ENGINE_C_API(...) INFERENCE_ENGINE_C_API_EXTERN __VA_ARGS__ IE_1_0_DEPRECATED
 #    define IE_NODISCARD
 #else
 #    if defined(_WIN32) || defined(__CYGWIN__)
 #        define INFERENCE_ENGINE_C_API_CALLBACK __cdecl
 #        ifdef openvino_c_EXPORTS
 #            define INFERENCE_ENGINE_C_API(...) INFERENCE_ENGINE_C_API_EXTERN __declspec(dllexport) __VA_ARGS__ __cdecl
 #        else
-#            define INFERENCE_ENGINE_C_API(...) INFERENCE_ENGINE_C_API_EXTERN __declspec(dllimport) __VA_ARGS__ __cdecl
+#            define INFERENCE_ENGINE_C_API(...) \
+                INFERENCE_ENGINE_C_API_EXTERN __declspec(dllimport) __VA_ARGS__ IE_1_0_DEPRECATED __cdecl
 #        endif
 #        define IE_NODISCARD
 #    else
 #        define INFERENCE_ENGINE_C_API(...) \
-            INFERENCE_ENGINE_C_API_EXTERN __attribute__((visibility("default"))) __VA_ARGS__
+            INFERENCE_ENGINE_C_API_EXTERN __attribute__((visibility("default"))) __VA_ARGS__ IE_1_0_DEPRECATED
 #        define IE_NODISCARD __attribute__((warn_unused_result))
 #    endif
 #endif

src/bindings/c/src/CMakeLists.txt

@@ -6,6 +6,7 @@ set(TARGET_NAME openvino_c)
 
 # Suppress warnings due to catch macro with legacy exception types
 ov_deprecated_no_errors()
+add_definitions(-DIN_OV_COMPONENT)
 
 file(GLOB SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/*.cpp)
 file(GLOB_RECURSE HEADERS ${OpenVINO_C_API_SOURCE_DIR}/include/*.h)

src/bindings/c/src/ie_c_api.cpp

@@ -1706,4 +1706,4 @@ void ie_blob_free(ie_blob_t** blob) {
 
 void ie_shutdown() {
     InferenceEngine::shutdown();
-}
+}

src/bindings/c/tests/ie_c_api_test.cpp

@@ -5,17 +5,22 @@
 #include <gtest/gtest.h>
 #include <stdio.h>
 #include <stdlib.h>
+
 #include <condition_variable>
+#include <fstream>
+#include "inference_engine.hpp"
 #include <mutex>
-#include <c_api/ie_c_api.h>
-#include <inference_engine.hpp>
+
 #include "test_model_repo.hpp"
-#include <fstream>
 
 #define IE_EXPECT_OK(...) EXPECT_EQ(IEStatusCode::OK, __VA_ARGS__)
 #define IE_ASSERT_OK(...) ASSERT_EQ(IEStatusCode::OK, __VA_ARGS__)
 #define IE_EXPECT_NOT_OK(...) EXPECT_NE(IEStatusCode::OK, __VA_ARGS__)
 
+OPENVINO_SUPPRESS_DEPRECATED_START
+
+#include <c_api/ie_c_api.h>
+
 static std::mutex m;
 static bool ready = false;
 static std::condition_variable condVar;
@@ -1503,3 +1508,5 @@ TEST_P(ie_c_api_test, ie_infer_set_completion_callback) {
     ie_network_free(&network);
     ie_core_free(&core);
 }
+
+OPENVINO_SUPPRESS_DEPRECATED_END