CMake: how to link against libtbb_preview rather than libtbb consistently?

[Jorrit_F_]

What is the canonical way to tell a cmake-using library that normally links against libtbb to link against libtbb_preview instead?

Alternatively, is there a way to detect when a program or library tries to link to two incompatible versions of libtbb (like libtbb and libtbb_preview)?

Background

We want a canonical way to do this because we're trying to fix a problem where two libraries ship their own FindTBB.cmake but use slightly incompatible implementations.  In the future we will likely make use of further TBB-using libraries, so we want to come up with a FindTBB.cmake that behaves sensibly.  The only source of what "sensible" means that we could find is TBBConfig.cmake shipped with the binary distributions of TBB from
https://github.com/01org/tbb/releases.

However, one of our libraries requires libtbb_preview in some of its development branches, while the other libraries could use either libtbb or libtbb_preview -- we just need a way to tell it to use the preview version rather than plain libtbb.

The issue in our tracker: https://gitlab.dune-project.org/core/dune-common/issues/85

[Alexey_M_Intel1]

Hello, Jorrit F.

If you want to link your application with preview library then you need to import tbb_preview target:

    find_package(TBB REQUIRED tbb_preview)

    target_link_libraries(<your_project> ${TBB_IMPORTED_TARGETS})

or

    target_link_libraries(<your_project> TBB::tbb_preview)