From c63d79c5b16fcbbec46f1b8bb871dab2274e2b01 Mon Sep 17 00:00:00 2001
From: Yuantao Feng <yuantao.feng@opencv.org.cn>
Date: Mon, 16 Jan 2023 17:44:13 +0800
Subject: [PATCH] Merge pull request #23095 from fengyuentau:fix_omp_macos

* fix openmp include and link issue on macos

* turn off have_openmp if OpenMP_CXX_INCLUDE_DIRS is empty

* test commit

* use condition HAVE_OPENMP and OpenMP_CXX_LIBRARIES for linking

* remove trailing whitespace

* remove notes

* update conditions

* use OpenMP_CXX_LIBRARIES for linking
---
 cmake/OpenCVFindFrameworks.cmake | 3 +++
 modules/core/CMakeLists.txt      | 4 ++++
 modules/video/CMakeLists.txt     | 4 ++++
 3 files changed, 11 insertions(+)

diff --git a/cmake/OpenCVFindFrameworks.cmake b/cmake/OpenCVFindFrameworks.cmake
index 19f6d66340..741267d269 100644
--- a/cmake/OpenCVFindFrameworks.cmake
+++ b/cmake/OpenCVFindFrameworks.cmake
@@ -32,6 +32,9 @@ if(WITH_OPENMP)
   if(OPENMP_FOUND)
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OpenMP_C_FLAGS}")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}")
+    if(DEFINED OpenMP_CXX_INCLUDE_DIRS AND OpenMP_CXX_INCLUDE_DIRS)
+      ocv_include_directories(${OpenMP_CXX_INCLUDE_DIRS})
+    endif()
   endif()
   set(HAVE_OPENMP "${OPENMP_FOUND}")
 endif()
diff --git a/modules/core/CMakeLists.txt b/modules/core/CMakeLists.txt
index eab909843b..fe747540e8 100644
--- a/modules/core/CMakeLists.txt
+++ b/modules/core/CMakeLists.txt
@@ -168,6 +168,10 @@ if(HAVE_HPX)
   ocv_target_link_libraries(${the_module} LINK_PRIVATE "${HPX_LIBRARIES}")
 endif()
 
+if(HAVE_OPENMP AND DEFINED OpenMP_CXX_LIBRARIES AND OpenMP_CXX_LIBRARIES)
+  ocv_target_link_libraries(${the_module} LINK_PRIVATE "${OpenMP_CXX_LIBRARIES}")
+endif()
+
 ocv_add_accuracy_tests()
 ocv_add_perf_tests()
 
diff --git a/modules/video/CMakeLists.txt b/modules/video/CMakeLists.txt
index 8499de9169..a302e5a5d1 100644
--- a/modules/video/CMakeLists.txt
+++ b/modules/video/CMakeLists.txt
@@ -10,3 +10,7 @@ ocv_define_module(video
       python
       js
 )
+
+if(HAVE_OPENMP AND DEFINED OpenMP_CXX_LIBRARIES AND OpenMP_CXX_LIBRARIES)
+  ocv_target_link_libraries(${the_module} LINK_PRIVATE "${OpenMP_CXX_LIBRARIES}")
+endif()