`FindTBB.cmake` cannot find correct TBB library.

[gnaggnoyil]

Expected Behavior

After enabling HPX_WITH_EXAMPLES_TBB option at configuration time, the test tbb_homogeneous_timed_task_spawn specified in tests/performance/local/CMakeLists.txt should be built and be tested when invoking CTest.

Actual Behavior

The test tbb_homogeneous_timed_task_spawn is not invoked during CTest

Steps to Reproduce the Problem

1. mkdir -p <hpx_source_dir>/build && cd <hpx_source_dir>/build
2. cmake -DHPX_WITH_EXAMPLES_TBB=ON ..
   In this step the following warning message appears:

   -- Nice threadlevel is disabled.
   -- Stack traces are enabled.
   CMake Warning (dev) at /usr/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:438 (message):
     The package name passed to `find_package_handle_standard_args` (TBBmalloc)
     does not match the name of the calling package (TBB).  This can lead to
     problems in calling code that expects `find_package` result variables
     (e.g., `_FOUND`) to follow a certain pattern.
   Call Stack (most recent call first):
     cmake/FindTBB.cmake:44 (find_package_handle_standard_args)
     CMakeLists.txt:1365 (find_package)
   This warning is for project developers.  Use -Wno-dev to suppress it.
   
   -- Could NOT find TBBmalloc (missing: Tbb_LIBRARY) 
   -- Compiling with the native toolset
   -- Performing Test HPX_WITH_CXX11_ATOMIC - Success
   

3. cmake --build .
4. ctest | grep tbb_homogeneous_timed_task_spawn
   Nothing to output from stdout.

Specifications

• HPX Version: current master (5898e7e)
• Platform (compiler, OS): Archlinux, with the following packages installed from Arch offical repo:

  pacman -Qs | grep -E '(/gcc )|(/onetbb )|(/cmake )' 
  local/cmake 3.29.5-2
  local/gcc 14.1.1+r58+gfc9fb69ad62-1
  local/onetbb 2021.12.0-2
  

• The contents of file /usr/lib/pkgconfig/tbb.pc from package onetbb is:

  # Copyright (c) 2021-2023 Intel Corporation
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  prefix=/usr
  libdir=${prefix}/lib
  includedir=${prefix}/include
  
  Name: oneAPI Threading Building Blocks (oneTBB)
  Description: C++ library for parallel programming on multi-core processors.
  URL: https://github.com/oneapi-src/oneTBB
  Version: 2021.12.0
  Libs: -L${libdir}  -ltbb
  Cflags: -I${includedir}
  

[Hartmut Kaiser]

We should probably remove this example and the (optional) dependency on TBB. This code has not been looked at in over 10 years, IIRC.