Fixed C samples build on Windows (#14386)

samples/cpp/CMakeLists.txt

@@ -97,9 +97,14 @@ if(NOT DEFINED CMAKE_CXX_STANDARD)
 endif()
 ####################################
 
+if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/common/utils")
+    # gflags is used only in C++ samples
+    set(gflags_required ON)
+endif()
+
 if(TARGET gflags)
     set(GFLAGS_TARGET gflags)
-else()
+elseif(gflags_required)
     if(EXISTS /etc/debian_version)
         set(gflags_component nothreads_static)
     else()
@@ -223,9 +228,6 @@ macro(ie_add_sample)
     target_include_directories(${IE_SAMPLE_NAME} PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/../common")
 
     target_link_libraries(${IE_SAMPLE_NAME} PRIVATE ${ov_link_libraries} Threads::Threads ${IE_SAMPLE_DEPENDENCIES})
-    if(NOT c_sample)
-        target_link_libraries(${IE_SAMPLE_NAME} PRIVATE ${GFLAGS_TARGET})
-    endif()
 
     install(TARGETS ${IE_SAMPLE_NAME}
             RUNTIME DESTINATION samples_bin/

samples/cpp/benchmark_app/CMakeLists.txt

@@ -10,7 +10,7 @@ file (GLOB HDR ${CMAKE_CURRENT_SOURCE_DIR}/*.hpp)
 ie_add_sample(NAME ${TARGET_NAME}
               SOURCES ${SRC}
               HEADERS ${HDR}
-              DEPENDENCIES format_reader ie_samples_utils)
+              DEPENDENCIES ${GFLAGS_TARGET} format_reader ie_samples_utils)
 
 # Required nlohmann_json dependency
 

samples/cpp/classification_sample_async/CMakeLists.txt

@@ -5,4 +5,4 @@
 ie_add_sample(NAME classification_sample_async
               SOURCES "${CMAKE_CURRENT_SOURCE_DIR}/main.cpp"
               HEADERS "${CMAKE_CURRENT_SOURCE_DIR}/classification_sample_async.h"
-              DEPENDENCIES format_reader ie_samples_utils)
+              DEPENDENCIES ${GFLAGS_TARGET} format_reader ie_samples_utils)

samples/cpp/speech_sample/CMakeLists.txt

@@ -40,4 +40,4 @@ endif()
 ie_add_sample(NAME speech_sample
               SOURCES ${SRC}
               HEADERS ${HDR}
-              DEPENDENCIES cnpy ie_samples_utils)
+              DEPENDENCIES ${GFLAGS_TARGET} cnpy ie_samples_utils)

thirdparty/CMakeLists.txt

@@ -373,7 +373,6 @@ elseif(APPLE OR WIN32)
             PATTERN .lgtm.yml EXCLUDE
             PATTERN Makefile EXCLUDE
             PATTERN meson.build EXCLUDE
-            PATTERN nlohmann_json.natvis EXCLUDE
             PATTERN README.md EXCLUDE
             PATTERN .reuse EXCLUDE
             PATTERN tests EXCLUDE