FindTBB.cmake

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#.rst:
# FindTBB
# -------
#
# Find Intel's Threading Building Blocks (TBB) include path and libraries.
#
# This module reads hints about search locations from variables:
#
# ::
#
#    TBB_ROOT                         - Root directory of pre-built TBB package.
#                                       Can be an environment variable instead. It is
#                                       derived from the found TBB_INCLUDE_DIR if unset.
#    TBB_ARCH_PLATFORM                - Environment variable which can be used to specify
#                                       architecture and platform specific library path
#                                       suffix (excluding "/lib/" suffix or prefix).
#                                       For MSVC, the appropriate link library path of the
#                                       official pre-built download package from the TBB
#                                       web site is chosen by this module. The path suffix
#                                       derived from this variable takes precedence.
#
# This module considers the following CMake variables set by find_package:
#
# ::
#
#    TBB_FIND_COMPONENTS              - Case-insensitive names of requested libraries:
#                                       tbb, [tbb]malloc, [tbb]malloc_proxy
#    TBB_FIND_REQUIRED_<C>            - Whether TBB library component <C> is required.
#                                       TBB is considered to be not found when at least
#                                       one required library or its include path is missing.
#                                       When no TBB_FIND_COMPONENTS are specified, only the
#                                       threading library "tbb" is required.
#    TBB_FIND_REQUIRED                - Raise FATAL_ERROR when required components not found.
#    TBB_FIND_QUIETLY                 - Suppress all other (status) messages.
#
# The TBB_DEBUG variable can be set to TRUE before find_package(TBB) to
# enable verbose output which helps to debug the processing of this module:
#
# ::
#
#    set(TBB_DEBUG TRUE)
#    find_package(TBB)
#
# This module defines the following variables:
#
# ::
#
#    TBB_FOUND                        - Whether TBB libraries were found.
#    TBB_INCLUDE_DIR                  - TBB library include path where tbb/tbb_stddef.h is located.
#                                       Used as HINTS for find_path of TBB_<C>_INCLUDE_DIR.
#    TBB_INCLUDE_DIRS                 - Include paths of found TBB libraries.
#    TBB_LIBRARIES                    - File paths of found TBB libraries.
#    TBB_VERSION                      - Version for use in VERSION_LESS et al. comparisons.
#    TBB_VERSION_MAJOR                - Major library version number.
#    TBB_VERSION_MINOR                - Minor library version number.
#    TBB_VERSION_STRING               - Version string for output messages.
#    TBB_INTERFACE_VERSION            - API version number.
#    TBB_COMPATIBLE_INTERFACE_VERSION - The oldest major version still supported.
#
# Additionally, for each requested component, this module defines the following variables:
#
# ::
#
#    TBB_TBB_FOUND                    - Whether TBB threading library was found.
#    TBB_TBB_INCLUDE_DIR              - Include path of TBB threading library.
#    TBB_TBB_INCLUDE_DIRS             - Include paths for use of TBB library.
#    TBB_TBB_LIBRARIES                - TBB threading library and transitive link dependencies.
#    TBB_TBB_LIBRARY_RELEASE          - File path of optimized TBB link library.
#    TBB_TBB_LIBRARY_DEBUG            - File path of TBB link library with debug symbols.
#    TBB_TBB_LIBRARY                  - File paths of both "optimized" and "debug" TBB threading link libraries.
#                                       When only one of these is found, this variable is set to either
#                                       TBB_TBB_LIBRARY_RELEASE or TBB_TBB_LIBRARY_DEBUG.
#
#    TBB_MALLOC_FOUND                 - Whether TBB malloc library was found.
#    TBB_MALLOC_INCLUDE_DIR           - Include path of TBB malloc library.
#    TBB_MALLOC_INCLUDE_DIRS          - Include paths for use of TBB malloc library.
#    TBB_MALLOC_LIBRARIES             - TBB malloc library and transitive link dependencies.
#    TBB_MALLOC_LIBRARY_RELEASE       - File path of optimized TBB malloc link library.
#    TBB_MALLOC_LIBRARY_DEBUG         - File path of TBB malloc link library with debug symbols.
#    TBB_MALLOC_LIBRARY               - File paths of both "optimized" and "debug" TBB malloc link libraries.
#                                       When only one of these is found, this variable is set to either
#                                       TBB_MALLOC_LIBRARY_RELEASE or TBB_MALLOC_LIBRARY_DEBUG.
#
#    TBB_MALLOC_PROXY_FOUND           - Whether TBB malloc proxy library was found.
#    TBB_MALLOC_PROXY_INCLUDE_DIR     - Include path of TBB malloc proxy library.
#    TBB_MALLOC_PROXY_INCLUDE_DIRS    - Include paths for use of TBB malloc proxy library.
#    TBB_MALLOC_PROXY_LIBRARIES       - TBB malloc proxy library and transitive link dependencies.
#    TBB_MALLOC_PROXY_LIBRARY_RELEASE - File path of optimized TBB malloc proxy link library.
#    TBB_MALLOC_PROXY_LIBRARY_DEBUG   - File path of TBB malloc proxy link library with debug symbols.
#    TBB_MALLOC_PROXY_LIBRARY         - File paths of both "optimized" and "debug" TBB malloc proxy link libraries.
#                                       When only one of these is found, this variable is set to either
#                                       TBB_MALLOC_PROXY_LIBRARY_RELEASE or TBB_MALLOC_PROXY_LIBRARY_DEBUG.
#
# of these, the following variables are added as advanced cache entries:
#
# ::
#
#    TBB_INCLUDE_DIR
#    TBB_<C>_INCLUDE_DIR
#    TBB_<C>_LIBRARY_RELEASE
#    TBB_<C>_LIBRARY_DEBUG
#
# This module further defines the following import targets with the IMPORTED and INTERFACE
# properties set appropriately such that only a target_link_libraries command is required
# to declare the dependency of another target on the respective TBB library component.
# The use of these import targets instead of above defined variables is recommended.
#
# ::
#
#    TBB::tbb          - TBB threading library.
#    TBB::malloc       - TBB malloc library.
#    TBB::malloc_proxy - TBB malloc proxy library.
#
# Example usage:
#
# ::
#
#    find_package(TBB REQUIRED COMPONENTS tbb OPTIONAL_COMPONENTS malloc)
#
#    add_executable(foo foo.cc)
#    target_link_libraries(foo TBB::tbb)
#    if (TARGET TBB::malloc)
#    # or if (TBB_MALLOC_FOUND)
#      target_link_libraries(foo TBB::malloc)
#    endif ()
#
# This module was written by Andreas Schuh for CMake BASIS with inspiration
# from the FindTBB module which was originally part of the Object-oriented
# Graphics Rendering Engine (OGRE) project with modifications by Robert Maynard.

#=============================================================================
# Copyright 2016 Andreas Schuh <andreas.schuh.84@gmail.com>
#
# Distributed under the OSI-approved BSD License (the "License");
# see accompanying file Copyright.txt for details.
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
#=============================================================================
# (To distribute this file outside of CMake, substitute the full
#  License text for the above reference.)

if (NOT TBB_FIND_QUIETLY)
  set(_TBB_FIND_STATUS "Looking for TBB")
  if (TBB_FIND_COMPONENTS)
    set(_TBB_FIND_STATUS "${_TBB_FIND_STATUS} [${TBB_FIND_COMPONENTS}]")
  endif ()
  if (NOT TBB_FIND_REQUIRED)
    set(_TBB_FIND_STATUS "${_TBB_FIND_STATUS} (optional)")
  endif ()
  message(STATUS "${_TBB_FIND_STATUS}...")
endif ()

# ------------------------------------------------------------------------------
# Default required/optional components
if (NOT TBB_FIND_COMPONENTS)
  set(TBB_FIND_COMPONENTS tbb malloc malloc_proxy)
  set(TBB_FIND_REQUIRED_tbb          TRUE)
  set(TBB_FIND_REQUIRED_malloc       FALSE)
  set(TBB_FIND_REQUIRED_malloc_proxy FALSE)
endif ()

# ------------------------------------------------------------------------------
# Normalize component names
set(_TBB_FIND_COMPONENTS)
foreach (__TBB_COMPONENT IN LISTS TBB_FIND_COMPONENTS)
  string(TOUPPER "${__TBB_COMPONENT}" _TBB_COMPONENT)
  string(REGEX REPLACE "^TBB_?([A-Z_]+)$" "\\1" _TBB_COMPONENT "${_TBB_COMPONENT}")
  if (_TBB_COMPONENT MATCHES "^(TBB|MALLOC|MALLOC_PROXY)$")
    set(_TBB_${_TBB_COMPONENT}_NAME ${__TBB_COMPONENT})
    list(APPEND _TBB_FIND_COMPONENTS ${_TBB_COMPONENT})
    if (TBB_FIND_REQUIRED_${__TBB_COMPONENT})
      set(_TBB_FIND_REQUIRED_${_TBB_COMPONENT} TRUE)
    else ()
      set(_TBB_FIND_REQUIRED_${_TBB_COMPONENT} FALSE)
    endif ()
  else ()
    message(FATAL_ERROR "Unknown TBB library component: ${__TBB_COMPONENT}\n"
                        "Valid component names are: tbb, [tbb]malloc, [tbb]malloc_proxy")
  endif ()
endforeach ()
unset(__TBB_COMPONENT)

if (TBB_DEBUG)
  message("** FindTBB: Components = [${_TBB_FIND_COMPONENTS}]")
endif ()

# ------------------------------------------------------------------------------
# Names of headers and libraries for each component
set(_TBB_TBB_LIB_NAMES_RELEASE          tbb)
set(_TBB_TBB_LIB_NAMES_DEBUG            tbb_debug)
set(_TBB_TBB_INC_NAMES                  tbb/tbb.h)

set(_TBB_MALLOC_LIB_NAMES_RELEASE       tbbmalloc)
set(_TBB_MALLOC_LIB_NAMES_DEBUG         tbbmalloc_debug)
set(_TBB_MALLOC_INC_NAMES               tbb/tbb.h)

set(_TBB_MALLOC_PROXY_LIB_NAMES_RELEASE tbbmalloc_proxy)
set(_TBB_MALLOC_PROXY_LIB_NAMES_DEBUG   tbbmalloc_proxy_debug)
set(_TBB_MALLOC_PROXY_INC_NAMES         tbb/tbbmalloc_proxy.h)

# ------------------------------------------------------------------------------
# Transitive link dependencies
set(_TBB_TBB_LIB_LINK_DEPENDS)
set(_TBB_MALLOC_LIB_LINK_DEPENDS)
set(_TBB_MALLOC_PROXY_LIB_LINK_DEPENDS)

if (UNIX AND NOT APPLE)
  # On Linux, the TBB threading library requires librt.so
  list(APPEND _TBB_TBB_LIB_LINK_DEPENDS rt)
endif ()

# ------------------------------------------------------------------------------
# Construct a set of search paths
set(_TBB_ARCH_PLATFORM $ENV{TBB_ARCH_PLATFORM})

if (NOT TBB_ROOT)
  file(TO_CMAKE_PATH "$ENV{TBB_ROOT}" TBB_ROOT)
endif ()

set(_TBB_INC_PATH_SUFFIXES include)

set(_TBB_LIB_PATH_SUFFIXES)
if (_TBB_ARCH_PLATFORM)
  list(APPEND _TBB_LIB_PATH_SUFFIXES lib/${_TBB_ARCH_PLATFORM})
  list(APPEND _TBB_LIB_PATH_SUFFIXES ${_TBB_ARCH_PLATFORM}/lib)
endif ()
list(APPEND _TBB_LIB_PATH_SUFFIXES lib)

if (WIN32 AND MSVC AND CMAKE_GENERATOR MATCHES "Visual Studio ([0-9]+)")
  set(_TBB_MSVS_VERSION ${CMAKE_MATCH_1})
  if (CMAKE_CL_64)
    list(APPEND _TBB_LIB_PATH_SUFFIXES lib/intel64/vc${_TBB_MSVS_VERSION})
    list(APPEND _TBB_LIB_PATH_SUFFIXES intel64/vc${_TBB_MSVS_VERSION}/lib)
    list(APPEND _TBB_LIB_PATH_SUFFIXES lib/ia64/vc${_TBB_MSVS_VERSION})
    list(APPEND _TBB_LIB_PATH_SUFFIXES ia64/vc${_TBB_MSVS_VERSION}/lib)
  else ()
    list(APPEND _TBB_LIB_PATH_SUFFIXES lib/ia32/vc${_TBB_MSVS_VERSION})
    list(APPEND _TBB_LIB_PATH_SUFFIXES ia32/vc${_TBB_MSVS_VERSION}/lib)
  endif ()
  unset(_TBB_MSVS_VERSION)
endif ()

if (TBB_DEBUG)
  message("** FindTBB: Initial search paths:")
  message("** FindTBB: - Root directory hints  = [${TBB_ROOT}]")
  message("** FindTBB: - Include path suffixes = [${_TBB_INC_PATH_SUFFIXES}]")
  message("** FindTBB: - Library path suffixes = [${_TBB_LIB_PATH_SUFFIXES}]")
endif ()

# ------------------------------------------------------------------------------
# Find common include directory 
#
# Looking for tbb/tbb_stddef.h because we use this path later to read this file
# in order to extract the version information. The tbb.h header should be in the
# same directory and is searched for separately as part of the "tbb" and "malloc"
# component search. The TBB_INCLUDE_DIR is then used as HINTS.
find_path(TBB_INCLUDE_DIR
  NAMES tbb/tbb_stddef.h
  HINTS ${TBB_ROOT}
  PATH_SUFFIXES ${_TBB_INC_PATH_SUFFIXES}
)

mark_as_advanced(TBB_INCLUDE_DIR)

# ------------------------------------------------------------------------------
# Derive TBB_ROOT from TBB_INCLUDE_DIR if unset
if (TBB_INCLUDE_DIR AND NOT TBB_ROOT)
  if (_TBB_INC_PATH_SUFFIXES MATCHES "[^/;]/[^/;]")
    string(LENGTH "${TBB_INCLUDE_DIR}" _TBB_INCLUDE_DIR_LENGTH)
    foreach (_TBB_INC_PATH_SUFFIX IN LISTS _TBB_INC_PATH_SUFFIXES)
      string(LENGTH "${_TBB_INC_PATH_SUFFIX}" _TBB_INC_PATH_SUFFIX_LENGTH)
      if (_TBB_INC_PATH_SUFFIX_LENGTH GREATER 0)
        math(EXPR _TBB_SUBSTRING_START "${_TBB_INCLUDE_DIR_LENGTH} - ${_TBB_INC_PATH_SUFFIX_LENGTH}")
        string(SUBSTRING "${TBB_INCLUDE_DIR}" _TBB_SUBSTRING_START -1 _TBB_SUBSTRING)
        if (_TBB_SUBSTRING STREQUAL _TBB_INC_PATH_SUFFIX)
          if (_TBB_SUBSTRING_START GREATER 0)
            string(SUBSTRING "${TBB_INCLUDE_DIR}" 0 _TBB_SUBSTRING_START TBB_ROOT)
            string(REGEX REPLACE "/+$" "" TBB_ROOT "${TBB_ROOT}")
          else ()
            set(TBB_ROOT "/")
          endif ()
          break()
        endif ()
      endif ()
    endforeach ()
    unset(_TBB_SUBSTRING)
    unset(_TBB_SUBSTRING_START)
    unset(_TBB_INCLUDE_DIR_LENGTH)
    unset(_TBB_INC_PATH_SUFFIX_LENGTH)
  else ()
    get_filename_component(TBB_ROOT "${TBB_INCLUDE_DIR}" DIRECTORY)
  endif ()
endif ()

if (TBB_DEBUG)
  message("** FindTBB: After initial search of TBB include path")
  message("** FindTBB: - TBB_INCLUDE_DIR = ${TBB_INCLUDE_DIR}")
  message("** FindTBB: - TBB_ROOT        = [${TBB_ROOT}]")
endif ()

# ------------------------------------------------------------------------------
# Find library components
set(TBB_INCLUDE_DIRS)
set(TBB_LIBRARIES)

foreach (_TBB_COMPONENT IN LISTS _TBB_FIND_COMPONENTS)
  if (TBB_DEBUG)
    message("** FindTBB: Looking for component ${_TBB_COMPONENT}...")
  endif ()

  # Find include path and library files of this component
  find_path(TBB_${_TBB_COMPONENT}_INCLUDE_DIR
    NAMES ${_TBB_${_TBB_COMPONENT}_INC_NAMES}
    HINTS ${TBB_INCLUDE_DIR} ${TBB_ROOT}
    PATH_SUFFIXES ${_TBB_INC_PATH_SUFFIXES}
  )

  find_library(TBB_${_TBB_COMPONENT}_LIBRARY_RELEASE
    NAMES ${_TBB_${_TBB_COMPONENT}_LIB_NAMES_RELEASE}
    HINTS ${TBB_ROOT}
    PATH_SUFFIXES ${_TBB_LIB_PATH_SUFFIXES}
  )

  find_library(TBB_${_TBB_COMPONENT}_LIBRARY_DEBUG
    NAMES ${_TBB_${_TBB_COMPONENT}_LIB_NAMES_DEBUG}
    HINTS ${TBB_ROOT}
    PATH_SUFFIXES ${_TBB_LIB_PATH_SUFFIXES}
  )

  if (TBB_DEBUG)
    message("** FindTBB: - TBB_${_TBB_COMPONENT}_INCLUDE_DIR     = ${TBB_${_TBB_COMPONENT}_INCLUDE_DIR}")
    message("** FindTBB: - TBB_${_TBB_COMPONENT}_LIBRARY_RELEASE = ${TBB_${_TBB_COMPONENT}_LIBRARY_RELEASE}")
    message("** FindTBB: - TBB_${_TBB_COMPONENT}_LIBRARY_DEBUG   = ${TBB_${_TBB_COMPONENT}_LIBRARY_DEBUG}")
  endif ()

  # Mark cache entries as advanced
  mark_as_advanced(TBB_${_TBB_COMPONENT}_INCLUDE_DIR)
  mark_as_advanced(TBB_${_TBB_COMPONENT}_LIBRARY_RELEASE)
  mark_as_advanced(TBB_${_TBB_COMPONENT}_LIBRARY_DEBUG)

  # Set TBB_<C>_LIBRARY
  if (TBB_${_TBB_COMPONENT}_LIBRARY_RELEASE AND TBB_${_TBB_COMPONENT}_LIBRARY_DEBUG)
    set(TBB_${_TBB_COMPONENT}_LIBRARY
      optimized ${TBB_${_TBB_COMPONENT}_LIBRARY_RELEASE}
      debug     ${TBB_${_TBB_COMPONENT}_LIBRARY_DEBUG}
    )
  elseif (TBB_${_TBB_COMPONENT}_LIBRARY_RELEASE)
    set(TBB_${_TBB_COMPONENT}_LIBRARY ${TBB_${_TBB_COMPONENT}_LIBRARY_RELEASE})
  elseif (TBB_${_TBB_COMPONENT}_LIBRARY_DEBUG)
    set(TBB_${_TBB_COMPONENT}_LIBRARY ${TBB_${_TBB_COMPONENT}_LIBRARY_DEBUG})
  else ()
    set(TBB_${_TBB_COMPONENT}_LIBRARY TBB_${_TBB_COMPONENT}_LIBRARY-NOTFOUND)
  endif ()

  # Set TBB_<C>_FOUND
  if (TBB_${_TBB_COMPONENT}_INCLUDE_DIR AND TBB_${_TBB_COMPONENT}_LIBRARY)
    set(TBB_${_TBB_COMPONENT}_FOUND TRUE)
  else ()
    set(TBB_${_TBB_COMPONENT}_FOUND FALSE)
  endif ()
  set(TBB_${_TBB_${_TBB_COMPONENT}_NAME}_FOUND ${TBB_${_TBB_COMPONENT}_FOUND})

  if (TBB_${_TBB_COMPONENT}_FOUND)

    # Add transitive dependencies
    set(TBB_${_TBB_COMPONENT}_INCLUDE_DIRS ${TBB_${_TBB_COMPONENT}_INCLUDE_DIR})
    set(TBB_${_TBB_COMPONENT}_LIBRARIES    ${TBB_${_TBB_COMPONENT}_LIBRARY})
    if (_TBB_${_TBB_COMPONENT}_LIB_LINK_DEPENDS)
      list(APPEND TBB_${_TBB_COMPONENT}_LIBRARIES "${_TBB_${_TBB_COMPONENT}_LIB_LINK_DEPENDS}")
    endif ()

    if (TBB_DEBUG)
      message("** FindTBB: - TBB_${_TBB_COMPONENT}_INCLUDE_DIRS    = [${TBB_${_TBB_COMPONENT}_INCLUDE_DIRS}]")
      message("** FindTBB: - TBB_${_TBB_COMPONENT}_LIBRARIES       = [${TBB_${_TBB_COMPONENT}_LIBRARIES}]")
    endif ()

    # Add to TBB_INCLUDE_DIRS and TBB_LIBRARIES
    list(APPEND TBB_INCLUDE_DIRS ${TBB_${_TBB_COMPONENT}_INCLUDE_DIRS})
    list(APPEND TBB_LIBRARIES    ${TBB_${_TBB_COMPONENT}_LIBRARIES})

    # Add TBB::<C> import target
    string(TOLOWER ${_TBB_COMPONENT} _TBB_TARGET_NAME)
    set(_TBB_TARGET_NAME "TBB::${_TBB_TARGET_NAME}")
    add_library(${_TBB_TARGET_NAME} SHARED IMPORTED)

    set_target_properties(${_TBB_TARGET_NAME} PROPERTIES
      INTERFACE_INCLUDE_DIRECTORIES     "${TBB_${_TBB_COMPONENT}_INCLUDE_DIRS}"
      IMPORTED_LINK_INTERFACE_LANGUAGES CXX
      IMPORTED_NO_SONAME                TRUE
    )
    if (_TBB_${_TBB_COMPONENT}_LIB_LINK_DEPENDS)
      set_target_properties(${_TBB_TARGET_NAME} PROPERTIES
        INTERFACE_LINK_LIBRARIES "${_TBB_${_TBB_COMPONENT}_LIB_LINK_DEPENDS}"
      )
    endif ()

    foreach (_TBB_CONFIGURATION IN ITEMS DEBUG RELEASE)
      if (TBB_${_TBB_COMPONENT}_LIBRARY_${_TBB_CONFIGURATION})
        set_property(TARGET ${_TBB_TARGET_NAME} APPEND PROPERTY IMPORTED_CONFIGURATIONS ${_TBB_CONFIGURATION})
        if (WIN32)
          set_target_properties(${_TBB_TARGET_NAME} PROPERTIES
            IMPORTED_IMPLIB_${_TBB_CONFIGURATION} "${TBB_${_TBB_COMPONENT}_LIBRARY_${_TBB_CONFIGURATION}}"
          )
          string(REPLACE       "/lib/"   "/bin/" _TBB_LIB_PATH_DLL "${TBB_${_TBB_COMPONENT}_LIBRARY_${_TBB_CONFIGURATION}}")
          string(REGEX REPLACE "\\.lib$" ".dll"  _TBB_LIB_PATH_DLL "${_TBB_LIB_PATH_DLL}")
          if (EXISTS "${_TBB_LIB_PATH_DLL}")
            set_target_properties(${_TBB_TARGET_NAME} PROPERTIES
              IMPORTED_LOCATION_${_TBB_CONFIGURATION} "${_TBB_LIB_PATH_DLL}"
            )
            if (TBB_DEBUG)
              message("** FindTBB: - IMPORTED_LOCATION_${_TBB_CONFIGURATION} = ${_TBB_LIB_PATH_DLL}")
            endif ()
          elseif (TBB_DEBUG)
            message("** FindTBB: Could not determine ${_TBB_CONFIGURATION} DLL path from import library, tried: "
                    "\n\t${_TBB_LIB_PATH_DLL}")
          endif ()
        else ()
          set_target_properties(${_TBB_TARGET_NAME} PROPERTIES
            IMPORTED_LOCATION_${_TBB_CONFIGURATION} "${TBB_${_TBB_COMPONENT}_LIBRARY_${_TBB_CONFIGURATION}}"
          )
        endif ()
      endif ()
    endforeach ()

    if (TBB_DEBUG)
      message("** FindTBB: Looking for component ${_TBB_COMPONENT}... - found")
    endif ()

  else ()

    if (TBB_DEBUG)
      message("** FindTBB: Looking for component ${_TBB_COMPONENT}... - not found")
    endif ()
    unset(TBB_${_TBB_COMPONENT}_INCLUDE_DIRS)
    unset(TBB_${_TBB_COMPONENT}_LIBRARIES)

  endif ()
endforeach ()

if (TBB_INCLUDE_DIRS)
  list(REMOVE_DUPLICATES TBB_INCLUDE_DIRS)
endif ()

if (TBB_DEBUG)
  message("** FindTBB: Include paths and libraries of all found components:")
  message("** FindTBB: - TBB_INCLUDE_DIRS = [${TBB_INCLUDE_DIRS}]")
  message("** FindTBB: - TBB_LIBRARIES    = [${TBB_LIBRARIES}]")
endif ()

# ------------------------------------------------------------------------------
# Extract library version from start of tbb_stddef.h
if (TBB_INCLUDE_DIR)
  if (NOT DEFINED TBB_VERSION_MAJOR OR
      NOT DEFINED TBB_VERSION_MINOR OR
      NOT DEFINED TBB_INTERFACE_VERSION OR
      NOT DEFINED TBB_COMPATIBLE_INTERFACE_VERSION)
    file(READ "${TBB_INCLUDE_DIR}/tbb/tbb_stddef.h" _TBB_VERSION_CONTENTS LIMIT 2048)
    string(REGEX REPLACE
      ".*#define TBB_VERSION_MAJOR ([0-9]+).*" "\\1"
      TBB_VERSION_MAJOR "${_TBB_VERSION_CONTENTS}"
    )
    string(REGEX REPLACE
      ".*#define TBB_VERSION_MINOR ([0-9]+).*" "\\1"
      TBB_VERSION_MINOR "${_TBB_VERSION_CONTENTS}"
    )
    string(REGEX REPLACE
      ".*#define TBB_INTERFACE_VERSION ([0-9]+).*" "\\1"
      TBB_INTERFACE_VERSION "${_TBB_VERSION_CONTENTS}"
    )
    string(REGEX REPLACE
      ".*#define TBB_COMPATIBLE_INTERFACE_VERSION ([0-9]+).*" "\\1"
      TBB_COMPATIBLE_INTERFACE_VERSION "${_TBB_VERSION_CONTENTS}"
    )
    unset(_TBB_VERSION_CONTENTS)
  endif ()
  set(TBB_VERSION "${TBB_VERSION_MAJOR}.${TBB_VERSION_MINOR}")
  set(TBB_VERSION_STRING "${TBB_VERSION}")
else ()
  unset(TBB_VERSION)
  unset(TBB_VERSION_MAJOR)
  unset(TBB_VERSION_MINOR)
  unset(TBB_VERSION_STRING)
  unset(TBB_INTERFACE_VERSION)
  unset(TBB_COMPATIBLE_INTERFACE_VERSION)
endif ()

if (TBB_DEBUG)
  message("** FindTBB: Version information from ${TBB_INCLUDE_DIR}/tbb/tbb_stddef.h")
  message("** FindTBB: - TBB_VERSION_STRING               = ${TBB_VERSION_STRING}")
  message("** FindTBB: - TBB_VERSION_MAJOR                = ${TBB_VERSION_MAJOR}")
  message("** FindTBB: - TBB_VERSION_MINOR                = ${TBB_VERSION_MINOR}")
  message("** FindTBB: - TBB_INTERFACE_VERSION            = ${TBB_INTERFACE_VERSION}")
  message("** FindTBB: - TBB_COMPATIBLE_INTERFACE_VERSION = ${TBB_COMPATIBLE_INTERFACE_VERSION}")
endif ()

# ------------------------------------------------------------------------------
# Handle QUIET, REQUIRED, and [EXACT] VERSION arguments and set TBB_FOUND
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(TBB
  REQUIRED_VARS TBB_INCLUDE_DIR
  VERSION_VAR   TBB_VERSION
  HANDLE_COMPONENTS
)

if (NOT TBB_FIND_QUIETLY)
  if (TBB_FOUND)
    message(STATUS "${_TBB_FIND_STATUS}... - found v${TBB_VERSION_STRING}")
  else ()
    message(STATUS "${_TBB_FIND_STATUS}... - not found")
  endif ()
endif ()

# ------------------------------------------------------------------------------
# Unset local auxiliary variables
foreach (_TBB_COMPONENT IN ITEMS TBB MALLOC MALLOC_PROXY)
  unset(_TBB_FIND_REQUIRED_${_TBB_COMPONENT})
  unset(_TBB_${_TBB_COMPONENT}_LIB_NAMES_RELEASE)
  unset(_TBB_${_TBB_COMPONENT}_LIB_NAMES_DEBUG)
  unset(_TBB_${_TBB_COMPONENT}_LIB_LINK_DEPENDS)
  unset(_TBB_${_TBB_COMPONENT}_INC_NAMES)
  unset(_TBB_${_TBB_COMPONENT}_NAME)
endforeach ()

unset(_TBB_COMPONENT)
unset(_TBB_TARGET_NAME)
unset(_TBB_FIND_COMPONENTS)
unset(_TBB_FIND_STATUS)
unset(_TBB_INC_PATH_SUFFIXES)
unset(_TBB_LIB_PATH_SUFFIXES)
unset(_TBB_LIB_PATH_DLL)
unset(_TBB_LIB_NAME)
unset(_TBB_ARCH_PLATFORM)