[CMake] Support for Boost 1.70.0

[Michael Ellery]

whenever I use bleeding-edge boost, I try to grab the latest FindBoost:   https://github.com/Kitware/CMake/commits/master/Modules/FindBoost.cmake

..in particular, you probably want https://github.com/Kitware/CMake/commit/266808c4130a0b40aed236381707462a9368a1eb#diff-555801259d7df67368f7deab1f9deacd which doesn’t look like it’s been merged to release yet.

-Mike

> On Apr 12, 2019, at 7:31 AM, Stephan Menzel <stephan.menzel at gmail.com> wrote:
> 
> Hello List,
> 
> Boost 1.70.0 was just released and I'm integrating it into our projects. I notice FindBoost doesn't do the trick on Windows (MSVC141) anymore, on Linux / G++ it works fine. Here's what I do:
> 
> set(Boost_USE_STATIC_LIBS           ON) 
> set(Boost_USE_MULTITHREADED         ON)
> set(Boost_USE_STATIC_RUNTIME       OFF)
> set(Boost_USE_DEBUG_LIBS           OFF) 
> set(Boost_USE_DEBUG_RUNTIME        OFF) 
> 
> set(BOOST_INCLUDEDIR "${BOOST_ROOT}/include")
> set(BOOST_LIBRARYDIR "${BOOST_ROOT}/lib")
> 
> find_package(Boost REQUIRED
> 	COMPONENTS
> 	system
> 	filesystem 
> 	random 
> 	chrono
> 	log
> 	date_time 
> 	regex
> 	thread
> 	fiber
> 	exception
> 	program_options 
> 	unit_test_framework 
> )
> 
> It complains:
> Could not find the following static Boost libraries:
> 
> boost_system
> boost_log
> boost_unit_test_framework
> 
> Some (but not all) of the required Boost libraries were found. You may
> need to install these additional Boost libraries. Alternatively, set
> BOOST_LIBRARYDIR to the directory containing Boost libraries or BOOST_ROOT
> to the location of Boost.
> 
> Previous Boost versions worked. The libs are present as always and the same code works fine with 1.69.  
> 
> set(Boost_ADDITIONAL_VERSIONS "1.70.0") doesn't change anything as 1.70.0 appears to be already in the known versions struct in FindBoost. 
> 
> I have tested with CMake 3.13.4 and 3.14.1. Both fail.
> 
> I have worked my way through the FindBoost module but can't figure out what causes those 3 libs to appear missing. They do appear in the Variables View, with their correct filenames. Everything seems to be fine but the error stops execution. When I remove those 3 libs from the list, linking against imported targets later breaks.
> 
> Does anybody have the same issue upgrading? Is there a workaround perhaps?
> 
> Cheers,
> Stephan
> -- 
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