cmake: fix find process for InferenceEngine extra libraries

cmake/OpenCVDetectInferenceEngine.cmake

@@ -24,10 +24,33 @@ endif()
 
 # =======================
 
+macro(ocv_ie_find_extra_libraries find_prefix find_suffix)
+  file(GLOB libraries "${INF_ENGINE_LIB_DIRS}/${find_prefix}inference_engine*${find_suffix}")
+  foreach(full_path IN LISTS libraries)
+    get_filename_component(library "${full_path}" NAME_WE)
+    string(REPLACE "${find_prefix}" "" library "${library}")
+    if(library STREQUAL "inference_engine" OR library STREQUAL "inference_engined")
+      # skip
+    else()
+      add_library(${library} UNKNOWN IMPORTED)
+      set_target_properties(${library} PROPERTIES
+          IMPORTED_LOCATION "${full_path}")
+      list(APPEND custom_libraries ${library})
+    endif()
+  endforeach()
+endmacro()
+
 function(add_custom_ie_build _inc _lib _lib_rel _lib_dbg _msg)
   if(NOT _inc OR NOT (_lib OR _lib_rel OR _lib_dbg))
     return()
   endif()
+  if(NOT _lib)
+    if(_lib_rel)
+      set(_lib "${_lib_rel}")
+    else()
+      set(_lib "${_lib_dbg}")
+    endif()
+  endif()
   add_library(inference_engine UNKNOWN IMPORTED)
   set_target_properties(inference_engine PROPERTIES
     IMPORTED_LOCATION "${_lib}"
@@ -37,24 +60,31 @@ function(add_custom_ie_build _inc _lib _lib_rel _lib_dbg _msg)
   )
 
   set(custom_libraries "")
-  file(GLOB libraries "${INF_ENGINE_LIB_DIRS}/${CMAKE_SHARED_LIBRARY_PREFIX}inference_engine_*${CMAKE_SHARED_LIBRARY_SUFFIX}")
-  foreach(full_path IN LISTS libraries)
-    get_filename_component(library "${full_path}" NAME_WE)
-    string(REPLACE "${CMAKE_SHARED_LIBRARY_PREFIX}" "" library "${library}")
-    add_library(${library} UNKNOWN IMPORTED)
-    set_target_properties(${library} PROPERTIES
-      IMPORTED_LOCATION "${full_path}")
-    list(APPEND custom_libraries ${library})
+  set(__prefixes "${CMAKE_FIND_LIBRARY_PREFIXES}")
+  if(NOT __prefixes)
+    set(__prefixes "_empty_")
+  endif()
+  foreach(find_prefix ${__prefixes})
+    if(find_prefix STREQUAL "_empty_")  # foreach doesn't iterate over empty elements
+      set(find_prefix "")
+    endif()
+    foreach(find_suffix ${CMAKE_FIND_LIBRARY_SUFFIXES})
+      ocv_ie_find_extra_libraries("${find_prefix}" "${find_suffix}")
+    endforeach()
+    if(NOT CMAKE_FIND_LIBRARY_SUFFIXES)
+      ocv_ie_find_extra_libraries("${find_prefix}" "")
+    endif()
   endforeach()
 
   if(NOT INF_ENGINE_RELEASE VERSION_GREATER "2018050000")
     find_library(INF_ENGINE_OMP_LIBRARY iomp5 PATHS "${INF_ENGINE_OMP_DIR}" NO_DEFAULT_PATH)
     if(NOT INF_ENGINE_OMP_LIBRARY)
       message(WARNING "OpenMP for IE have not been found. Set INF_ENGINE_OMP_DIR variable if you experience build errors.")
-    else()
-      set_target_properties(inference_engine PROPERTIES IMPORTED_LINK_INTERFACE_LIBRARIES "${INF_ENGINE_OMP_LIBRARY}")
     endif()
   endif()
+  if(EXISTS "${INF_ENGINE_OMP_LIBRARY}")
+    set_target_properties(inference_engine PROPERTIES IMPORTED_LINK_INTERFACE_LIBRARIES "${INF_ENGINE_OMP_LIBRARY}")
+  endif()
   set(INF_ENGINE_VERSION "Unknown" CACHE STRING "")
   set(INF_ENGINE_TARGET "inference_engine;${custom_libraries}" PARENT_SCOPE)
   message(STATUS "Detected InferenceEngine: ${_msg}")
@@ -71,6 +101,9 @@ endif()
 
 if(NOT INF_ENGINE_TARGET AND INF_ENGINE_LIB_DIRS AND INF_ENGINE_INCLUDE_DIRS)
   find_path(ie_custom_inc "inference_engine.hpp" PATHS "${INF_ENGINE_INCLUDE_DIRS}" NO_DEFAULT_PATH)
+  if(CMAKE_BUILD_TYPE STREQUAL "Debug")
+    find_library(ie_custom_lib_dbg "inference_engined" PATHS "${INF_ENGINE_LIB_DIRS}" NO_DEFAULT_PATH)  # Win32 and MacOSX
+  endif()
   find_library(ie_custom_lib "inference_engine" PATHS "${INF_ENGINE_LIB_DIRS}" NO_DEFAULT_PATH)
   find_library(ie_custom_lib_rel "inference_engine" PATHS "${INF_ENGINE_LIB_DIRS}/Release" NO_DEFAULT_PATH)
   find_library(ie_custom_lib_dbg "inference_engine" PATHS "${INF_ENGINE_LIB_DIRS}/Debug" NO_DEFAULT_PATH)
@@ -89,6 +122,9 @@ if(NOT INF_ENGINE_TARGET AND _loc)
   endif()
   set(INF_ENGINE_PLATFORM "${INF_ENGINE_PLATFORM_DEFAULT}" CACHE STRING "InferenceEngine platform (library dir)")
   find_path(ie_custom_env_inc "inference_engine.hpp" PATHS "${_loc}/deployment_tools/inference_engine/include" NO_DEFAULT_PATH)
+  if(CMAKE_BUILD_TYPE STREQUAL "Debug")
+    find_library(ie_custom_env_lib_dbg "inference_engined" PATHS "${_loc}/deployment_tools/inference_engine/lib/${INF_ENGINE_PLATFORM}/intel64" NO_DEFAULT_PATH)
+  endif()
   find_library(ie_custom_env_lib "inference_engine" PATHS "${_loc}/deployment_tools/inference_engine/lib/${INF_ENGINE_PLATFORM}/intel64" NO_DEFAULT_PATH)
   find_library(ie_custom_env_lib_rel "inference_engine" PATHS "${_loc}/deployment_tools/inference_engine/lib/intel64/Release" NO_DEFAULT_PATH)
   find_library(ie_custom_env_lib_dbg "inference_engine" PATHS "${_loc}/deployment_tools/inference_engine/lib/intel64/Debug" NO_DEFAULT_PATH)