Re: [Boost-users] 1.66 changes in layout suffix seems to break cmake finder

Subject: Re: [Boost-users] 1.66 changes in layout suffix seems to break cmake finder
From: Klaim - Joël Lamotte (mjklaim_at_[hidden])
Date: 2018-01-08 15:36:30

On 8 January 2018 at 16:14, Stephan Menzel via Boost-users <
boost-users_at_[hidden]> wrote:

> Hello,
>
> I am currently trying to upgrade my projects to 1.66 and I am puzzled by a
> change in bjam's 'laout' parameter.
>
> I am building boost for MSVC14 (x64). Normally I use the following command
> line:
>
> > bjam.exe --layout=versioned variant=release address-model=64
> link=static,shared runtime-link=shared threading=multi stage
>
> to achieve the build flags and setup that I need.
> Up until 1.65 this yielded libs named like:
>
> libboost_atomic-vc140-mt-1_65.lib
>
> This is what appears to be the most flexible for my use case and I always
> discover them using the 'normal' CMake finders like this:
>
> set(BOOST_ROOT ${WHERE_MY_THIRD_PARTY_STUFF_IS}/boost-1.66.0
> CACHE PATH "set root of boost install")
> set(BOOST_INCLUDEDIR ${BOOST_ROOT}/include
> CACHE PATH "set boost includes")
> set(BOOST_LIBRARYDIR ${BOOST_ROOT}/lib
> CACHE PATH "set boost library dir")
> set(Boost_ADDITIONAL_VERSIONS "1.66.0")
>
> find_package(Boost REQUIRED COMPONENTS ...)
>
> Now over the years the meaning of the --layout parameter and its defaults
> have occasionally changed by I always managed to get something like this.
>
> But now, with 1.66 the filenames are changed to that:
>
> libboost_atomic-vc140-mt-x64-1_66.lib
>
> With this, CMake won't find the libs anymore. I have tried all different
> variantions of --layout I know (system, tagged, versioned) but I cannot get
> the old naming scheme back. I could rename the files manually but I am a
> bit afraid that this might break some linker (autolink) magick and also it
> doesn't seem right. Trying with several CMake finder options also got me
> nowhere. Using layout system is not desired as I like to quickly
> distinguish between versions on sight.
>  So my question is:
> Is there a way to get >=1.66 to build with the filename scheme it had
> until now? Or is there a change to the CMake finders that will fix this?
>
> Thanks for any suggestions...
>
>

Indeed CMake's FindBoost module needs to be uprgaded to be able to find
libs with the new name layout (although it needs to be upgraded each time
there is a boost release anyway...)
I would recommand trying this patch which is imminent to be merged in CMake
(just remplace your local FindBoost.cmake found in your CMake install dir):
https://gitlab.kitware.com/cmake/cmake/merge_requests/1625
Here is the related discussion:
https://gitlab.kitware.com/cmake/cmake/issues/17575

This mean to use the usual find_package( Boost ... ) instead of manually do
the discovery. Just specify BOOST_ROOT in CMake cli to specify the root
directory of your Boost install.

A. Joël Lamotte