Add an opportunity to use system TBB (#620)

Author: aobolensk

cmake/onetbb.cmake

@@ -1,40 +1,47 @@
 include(ExternalProject)
 
-if(WIN32)
-  set(ppc_onetbb_TEST_COMMAND
-      "${CMAKE_COMMAND}" -E copy_directory
-      "${CMAKE_CURRENT_BINARY_DIR}/ppc_onetbb/install/bin"
-      "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}")
-else()
-  set(ppc_onetbb_TEST_COMMAND "")
-endif()
+option(ENABLE_SYSTEM_TBB "Use system TBB instead of bundled version" OFF)
+
+if(NOT ENABLE_SYSTEM_TBB)
+  if(WIN32)
+    set(ppc_onetbb_TEST_COMMAND
+        "${CMAKE_COMMAND}" -E copy_directory
+        "${CMAKE_CURRENT_BINARY_DIR}/ppc_onetbb/install/bin"
+        "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}")
+  else()
+    set(ppc_onetbb_TEST_COMMAND "")
+  endif()
 
-ExternalProject_Add(
-  ppc_onetbb
-  SOURCE_DIR "${CMAKE_SOURCE_DIR}/3rdparty/onetbb"
-  PREFIX "${CMAKE_CURRENT_BINARY_DIR}/ppc_onetbb"
-  BINARY_DIR "${CMAKE_CURRENT_BINARY_DIR}/ppc_onetbb/build"
-  INSTALL_DIR "${CMAKE_CURRENT_BINARY_DIR}/ppc_onetbb/install"
-  CMAKE_ARGS -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
-             -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
-             -DCMAKE_C_COMPILER_LAUNCHER=${CMAKE_C_COMPILER_LAUNCHER}
-             -DCMAKE_CXX_COMPILER_LAUNCHER=${CMAKE_CXX_COMPILER_LAUNCHER}
-             -DCMAKE_C_FLAGS=-w
-             -DCMAKE_CXX_FLAGS=-w
-             -DCMAKE_CXX_STANDARD=${CMAKE_CXX_STANDARD}
-             -DCMAKE_CXX_STANDARD_REQUIRED=ON
-             -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
-             -DTBB_TEST=OFF
-  BUILD_COMMAND
-    "${CMAKE_COMMAND}" --build "${CMAKE_CURRENT_BINARY_DIR}/ppc_onetbb/build"
-    --config ${CMAKE_BUILD_TYPE} --parallel
-  INSTALL_COMMAND
-    "${CMAKE_COMMAND}" --install "${CMAKE_CURRENT_BINARY_DIR}/ppc_onetbb/build"
-    --prefix "${CMAKE_CURRENT_BINARY_DIR}/ppc_onetbb/install"
-  TEST_COMMAND ${ppc_onetbb_TEST_COMMAND})
+  ExternalProject_Add(
+    ppc_onetbb
+    SOURCE_DIR "${CMAKE_SOURCE_DIR}/3rdparty/onetbb"
+    PREFIX "${CMAKE_CURRENT_BINARY_DIR}/ppc_onetbb"
+    BINARY_DIR "${CMAKE_CURRENT_BINARY_DIR}/ppc_onetbb/build"
+    INSTALL_DIR "${CMAKE_CURRENT_BINARY_DIR}/ppc_onetbb/install"
+    CMAKE_ARGS -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
+               -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
+               -DCMAKE_C_COMPILER_LAUNCHER=${CMAKE_C_COMPILER_LAUNCHER}
+               -DCMAKE_CXX_COMPILER_LAUNCHER=${CMAKE_CXX_COMPILER_LAUNCHER}
+               -DCMAKE_C_FLAGS=-w
+               -DCMAKE_CXX_FLAGS=-w
+               -DCMAKE_CXX_STANDARD=${CMAKE_CXX_STANDARD}
+               -DCMAKE_CXX_STANDARD_REQUIRED=ON
+               -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
+               -DTBB_TEST=OFF
+    BUILD_COMMAND
+      "${CMAKE_COMMAND}" --build "${CMAKE_CURRENT_BINARY_DIR}/ppc_onetbb/build"
+      --config ${CMAKE_BUILD_TYPE} --parallel
+    INSTALL_COMMAND
+      "${CMAKE_COMMAND}" --install
+      "${CMAKE_CURRENT_BINARY_DIR}/ppc_onetbb/build" --prefix
+      "${CMAKE_CURRENT_BINARY_DIR}/ppc_onetbb/install"
+    TEST_COMMAND ${ppc_onetbb_TEST_COMMAND})
 
-install(DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/ppc_onetbb/install/"
-        DESTINATION "${CMAKE_INSTALL_PREFIX}")
+  install(DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/ppc_onetbb/install/"
+          DESTINATION "${CMAKE_INSTALL_PREFIX}")
+else()
+  find_package(TBB REQUIRED)
+endif()
 
 string(TOLOWER "${CMAKE_BUILD_TYPE}" cmake_build_type_lower)
 if(cmake_build_type_lower STREQUAL "debug")
@@ -44,14 +51,19 @@ else()
 endif()
 
 function(ppc_link_tbb exec_func_lib)
-  # Add external project include directories
-  target_include_directories(${exec_func_lib}
-                             PUBLIC ${CMAKE_SOURCE_DIR}/3rdparty/onetbb/include)
+  if(NOT ENABLE_SYSTEM_TBB)
+    # Add external project include directories
+    target_include_directories(
+      ${exec_func_lib} PUBLIC ${CMAKE_SOURCE_DIR}/3rdparty/onetbb/include)
 
-  add_dependencies(${exec_func_lib} ppc_onetbb)
-  target_link_directories(${exec_func_lib} PUBLIC
-                          ${CMAKE_BINARY_DIR}/ppc_onetbb/install/lib)
-  if(NOT MSVC)
-    target_link_libraries(${exec_func_lib} PUBLIC ${PPC_TBB_LIB_NAME})
+    add_dependencies(${exec_func_lib} ppc_onetbb)
+    target_link_directories(${exec_func_lib} PUBLIC
+                            ${CMAKE_BINARY_DIR}/ppc_onetbb/install/lib)
+    if(NOT MSVC)
+      target_link_libraries(${exec_func_lib} PUBLIC ${PPC_TBB_LIB_NAME})
+    endif()
+  else()
+    # Use system TBB
+    target_link_libraries(${exec_func_lib} PUBLIC TBB::tbb)
   endif()
 endfunction()