addresses an error when exporting a target that depends on tbb

I described this error with more detail in #5. I am by no means a cmake expert, but I needed this change for my work, and I wanted to contribute back since I have found findTBB.cmake helpful.

Thanks for this great module to find TBB...

TBB_LIBRARIES seems to only contain the debug libs?

TBB FOUND: TRUE
TBB VERSION: 4.4
TBB LIBRARIES: E:/library/development/tbb/tbb44_20160526oss/lib/intel64/vc14/tbb_preview_debug.libE:/library/development/tbb/tbb44_20160526oss/lib/intel64/vc14/tbbmalloc_debug.libE:/library/development/tbb/tbb44_20160526oss/lib/intel64/vc14/tbb_debug.lib

I haven't set to use TBB_USE_DEBUG_BUILD but CMake is configuring a Debug build option (along with Release) and that seems to trigger this conditional to never get to the release built components.

# Set the library to be used for the component
if(NOT TBB_${_comp}_LIBRARY)
   if(TBB_USE_DEBUG_BUILD AND TBB_${_comp}_LIBRARY_DEBUG)
     set(TBB_${_comp}_LIBRARY "${TBB_${_comp}_LIBRARY_DEBUG}")
   elseif(TBB_${_comp}_LIBRARY_RELEASE)
     set(TBB_${_comp}_LIBRARY "${TBB_${_comp}_LIBRARY_RELEASE}")
   elseif(TBB_${_comp}_LIBRARY_DEBUG)
     set(TBB_${_comp}_LIBRARY "${TBB_${_comp}_LIBRARY_DEBUG}")
   endif()
endif()

Under Windows, importing TBB as a CMake target with target_link_libraries(executable tbb) does not work (See also #8 ). The problem, if I understand it correctly, is that an imported shared target can refer to only one file, which poses a problem with IMPORTED_LOCATION when there are several dll files, as is the case for the debug version or when one has several components.

With this PR, tbb is imported as an INTERFACE library instead, with all dependencies set correctly. This PR solves #8.

After upgrading my Ubuntu 14 to 16.04 LTS, FindTBB started to output the following error. The libtbb-dev package is installed (apt-get was used for that). Also, I'm using an updated version of FindTBB.cmake.

Could NOT find TBB (missing: TBB_LIBRARIES) (found version "4.4") Call Stack (most recent call first): /usr/share/cmake-3.5/Modules/FindPackageHandleStandardArgs.cmake:388 (_FPHSA_FAILURE_MESSAGE) cmake/FindTBB.cmake:256 (find_package_handle_standard_args) CMakeLists.txt:11 (find_package)

I just ran into a problem using the FindTBB tbb target. When I put tbb into the target link libraries of my project, I was getting a cmake error (well it was printed out as an error, but the cmake configure step seemed to generate everything) when calling install export. The error said that I was "exporting a target that had a dependency on the tbb target which was not also exported." I think this is because the tbb target is made with an add_library call for a real library rather than an imported library. I made a pull request with changes that made this error/warning go away.

As the TBB_LIB_PATH_SUFFIX is a semicolon seperated list on Windows, the double quotes have to be removed when expanding the variable. Else, the call to find_library will search for the single concatenated PATH_SUFFIXES and will not find anything at all. PS: For me it works on Windows with this change (see your issue #1).

• it always complains that

  CMake Error at C:/Users/user/Documents/github/FindTBB-master/FindTBB.cmake:187 (file):
  file failed to open for reading (No such file or directory):
  
   C:/Users/user/Documents/github/oneapi-tbb-2021.1.1/include/tbb/tbb_stddef.h
  Call Stack (most recent call first):
  CMakeLists.txt:39 (find_package)
  

• For https://github.com/oneapi-src/oneTBB There is no such header file

When using TBB_LIBRARIES one could simply set TBB_USE_DEBUG_BUILD=off to prevent linking against TBB debug libraries no matter what CMake configuration is set. No luck if you want to use the imported target tbb.

i got this while run

`cmake_minimum_required(VERSION 2.8)
project(MyProject)

list(APPEND CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake/modules/")

find_package(TBB COMPONENTS tbbmalloc tbbmalloc_proxy tbb_preview)

add_executable(myapp myapp)
target_include_directories(myapp PRIVATE ${TBB_INCLUDE_DIRS})
target_compile_definitions(myapp PRIVATE ${TBB_DEFINITIONS})
target_link_libraries(myapp ${TBB_LIBRARIES})`

this killing my i searched all google no solution

using ubuntu

When TBB is installed by brew it goes to a different location than you specified, so I added it as a second option to the default search path.

Signed-Off-By: James Till Matta

Hello,

What is the expected layout of TBBROOT. Suppose I installed in

/opt/tbb_install
    include/
    lib/

then $TBBROOT=/opt/tbb_install is what should be used. Is this correct?

I'm trying to debug this locally, but the brew installed TBB is always getting found over the custom one regardless of what TBBROOT actually is.