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# Search TBB library (4.1 - 4.4, 2017)
#
# Own TBB (3rdparty/tbb):
# - set cmake option BUILD_TBB to ON
#
# External TBB (from system):
# - Fedora: install 'tbb-devel' package
# - Ubuntu: install 'libtbb-dev' package
#
# External TBB (from official site):
# - Linux/OSX:
# - in tbbvars.sh replace 'SUBSTITUTE_INSTALL_DIR_HERE' with absolute path to TBB dir
# - in terminal run 'source tbbvars.sh intel64 linux' ('source tbbvars.sh' in OSX)
# - Windows:
# - in terminal run 'tbbvars.bat intel64 vs2015'
#
# Return:
# - HAVE_TBB set to TRUE
# - "tbb" target exists and added to OPENCV_LINKER_LIBS
function(ocv_tbb_verify)
if (NOT "$ENV{TBBROOT}" STREQUAL "")
# check that library and include dir are inside TBBROOT location
get_filename_component(_root "$ENV{TBBROOT}" ABSOLUTE)
get_filename_component(_lib "${TBB_ENV_LIB}" ABSOLUTE)
get_filename_component(_inc "${TBB_ENV_INCLUDE}" ABSOLUTE)
string(FIND "${_lib}" "${_root}" _lib_pos)
string(FIND "${_inc}" "${_root}" _inc_pos)
if (NOT (_lib_pos EQUAL 0 AND _inc_pos EQUAL 0))
message(SEND_ERROR
"Possible issue with TBB detection - TBBROOT is set, "
"but library/include path is not inside it:\n "
"TBBROOT: $ENV{TBBROOT}\n "
"(absolute): ${_root}\n "
"INCLUDE: ${_inc}\n "
"LIBRARY: ${_lib}\n")
endif()
endif()
endfunction()
function(ocv_tbb_env_guess _found)
find_path(TBB_ENV_INCLUDE NAMES "tbb/tbb.h" PATHS ENV CPATH NO_DEFAULT_PATH)
find_path(TBB_ENV_INCLUDE NAMES "tbb/tbb.h")
find_library(TBB_ENV_LIB NAMES "tbb" PATHS ENV LIBRARY_PATH ENV LD_LIBRARY_PATH NO_DEFAULT_PATH)
find_library(TBB_ENV_LIB NAMES "tbb")
find_library(TBB_ENV_LIB_DEBUG NAMES "tbb_debug" PATHS ENV LIBRARY_PATH ENV LD_LIBRARY_PATH NO_DEFAULT_PATH)
find_library(TBB_ENV_LIB_DEBUG NAMES "tbb_debug")
if (TBB_ENV_INCLUDE AND TBB_ENV_LIB)
ocv_tbb_verify()
ocv_tbb_read_version("${TBB_ENV_INCLUDE}")
add_library(tbb UNKNOWN IMPORTED)
set_target_properties(tbb PROPERTIES
IMPORTED_LOCATION "${TBB_ENV_LIB}"
IMPORTED_LOCATION_DEBUG "${TBB_ENV_LIB_DEBUG}"
INTERFACE_INCLUDE_DIRECTORIES "${TBB_ENV_INCLUDE}"
)
message(STATUS "Found TBB: ${TBB_ENV_LIB}")
set(${_found} TRUE PARENT_SCOPE)
endif()
endfunction()
function(ocv_tbb_read_version _path)
find_file(TBB_VER_FILE tbb/tbb_stddef.h "${_path}" NO_DEFAULT_PATH CMAKE_FIND_ROOT_PATH_BOTH)
ocv_parse_header("${TBB_VER_FILE}" TBB_VERSION_LINES TBB_VERSION_MAJOR TBB_VERSION_MINOR TBB_INTERFACE_VERSION CACHE)
endfunction()
#=====================================================================
if(BUILD_TBB)
add_subdirectory("${OpenCV_SOURCE_DIR}/3rdparty/tbb")
message(STATUS "Found TBB: build")
set(HAVE_TBB TRUE)
endif()
if(NOT HAVE_TBB)
ocv_tbb_env_guess(HAVE_TBB)
endif()
if(TBB_INTERFACE_VERSION LESS 6000) # drop support of versions < 4.0
set(HAVE_TBB FALSE)
endif()
if(HAVE_TBB)
list(APPEND OPENCV_LINKER_LIBS tbb)
endif()
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