A lot of parts of CGAL use `<thread>` in conjunction with TBB. I have
added the `find_package(Threads)` in `CGAL_target_use_TBB.cmake` for
convenience.
I have also restored FindTBB.cmake as a pure copy of
https://github.com/Kitware/VTK/blob/master/CMake/FindTBB.cmake
with that version:
> c7249fed2e73ce25fbbc53363d9caf4ab5cc9195
> Author: Cory Quammen <cory.quammen@kitware.com>
> Date: Thu Feb 14 23:21:09 2019 -0500
>
> FindTBB: handle basic linker scripts
>
> TBB binaries may define libtbb.so as a linker script of the form
>
> INPUT(libtbb.so.2)
>
> Make FindTBB find the real .so file libtbb.so points to in such cases.
>
> Approach borrowed from vtk-m/CMake/VTKmDeviceAdapters.cmake on
> suggestion from Robert Maynard.
>
>
If the environment variable `CGAL_DEV_MODE` is set to a "true" value,
according to CMake, then the `CGAL_DEV_MODE` CMake option is `ON` by
default.
https://cmake.org/Wiki/CMake/Language_Syntax#CMake_supports_boolean_variables.
> CMake considers an empty string, "FALSE", "OFF", "NO", or any string
> ending in "-NOTFOUND" to be false. [..] Other values are true.
CMake does not like that the documentation of a CMake cache variable is
multiline. That triggers an error once the cache is re-loaded, the second
time.
Previously there was a variable CGAL_SHARED_LIBS defined by
CGALConfig.cmake. This one is now unified with CGAL_BUILD_SHARED_LIBS.
And the option CGAL_BUILD_SHARED_LIBS is only defined as an option if one
are building CGAL libraries. If CGAL_Common.cmake is included from another
project, such as from UseCGAL.cmake, then this variable is set in
CGALConfig.cmake as a regular (non-cached) CMake variable.
We declare
cmake_minimum_required(VERSION 2.6.2)
but we also use
cmake_policy(VERSION 2.8.4)
to declare that our CMake scripts are OK with all the defaults of CMake policies
as of CMake-2.8.4. That shuts down the warnings of CMake-2.8.4.
That way, we no longer need any declaration of specific policies.
Laurent Rineau
Maxime Gimeno
Simon Giraudot
Sébastien Loriot
Philipp Möller
Philipp Möller
Eric Berberich
Laurent Rineau
Andreas Fabri
Fernando Cacciola