Do you think, then, that we should embed a copy of FindBoost.cmake into OIIO, 
so that people with older cmake and newer boost don't have to install a whole 
new cmake? Does it rely on any new cmake features (I mean, how old a cmake will 
run cmake 1.14's FindBoost.cmake)?


> On Jul 12, 2019, at 11:37 AM, Nathan R <[email protected]> wrote:
> 
> It sounds like the FindBoost.cmake module distributed with CMake itself had 
> to be updated in order to support Boost 1.70+, so it may just be a matter of 
> updating CMake (or grabbing a fresh copy of FindBoost.cmake from the repo).
> 
> Possibly relevant:
> 
> https://cmake.org/pipermail/cmake/2019-April/069324.html 
> <https://cmake.org/pipermail/cmake/2019-April/069324.html>
> https://gitlab.kitware.com/cmake/cmake/issues/18865 
> <https://gitlab.kitware.com/cmake/cmake/issues/18865>
> https://github.com/Kitware/CMake/commit/266808c4130a0b40aed236381707462a9368a1eb#diff-555801259d7df67368f7deab1f9deacd
>  
> <https://github.com/Kitware/CMake/commit/266808c4130a0b40aed236381707462a9368a1eb#diff-555801259d7df67368f7deab1f9deacd>
> 
> -Nathan
> 
> On 7/12/2019 10:59 AM, Jim Hourihan wrote:
>> 
>> Hi Larry, here's the output from a couple of different failures and one
>> successful configure. It doesn't seem to matter if I use the release or
>> master branch. I've omitted all the non-boost output since those are same
>> regardless.
>> 
>> It seems to me find_package() should be picking up the Boost_* variables
>> but isn't. Those are definitely not defined in boost's cmake files for
>> 1.70.0. I've made sure there are no other copies of boost anywhere on my
>> machine (mac 10.14.5) including brew and ports versions.
>> 
>> I'm thinking I should try boost 1.53 and compare its .cmake files against
>> 1.70. 
>> 
>> Thanks for the help.
>> 
>>   -Jim
>> 
>>> On Jul 11, 2019, at 10:42 PM, Larry Gritz <[email protected] 
>>> <mailto:[email protected]>> wrote:
>>> 
>>> I use Boost 1.70 on my Mac (via Homebrew, so it's in /usr/local), and as a 
>>> matter of fact I just tested building against Boost 1.70 on Linux at work 
>>> this week. So I know it works.
>>> 
>>> Under ordinary circumstances, you shouldn't have to set those things 
>>> individually that you mention below.
>>> 
>>> It *ought* to be enough to -DBOOST_ROOT=$PREFIX
>>> 
>>> If things are laid out strangely underneath the prefix, though, you may 
>>> want to use -DBOOST_INCLUDEDIR=/custom/include/dir 
>>> -DBOOST_LIBRARYDIR=/custom/lib/dir
>>> 
>>> If that doesn't work, can you show us the resulting CMakeCache.txt and 
>>> exactly what errors it prints?
>>> 
>>> Which version of OIIO are you building? Do you still have the problem with 
>>> master?
>>> 
>>> 
>>>> On Jul 11, 2019, at 7:03 PM, Jim Hourihan <[email protected] 
>>>> <mailto:[email protected]>> wrote:
>>>> 
>>>> 
>>>> Hi All, I’m having some weird interaction between OIIO and boost’s cmake 
>>>> package files. I have a prefix area (let’s call it  /prefix/area) which I 
>>>> install all of OIIO’s dependencies into including boost 1.70.0.
>>>> 
>>>> Boost creates files and dirs in /prefix/area/lib/cmake. When I point OIIO 
>>>> at the prefix area for building and let it find boost  by itself it does, 
>>>> but then fails in OIIO’s externalpackages.cmake line 121. That line is 
>>>> attempting to dereference the variable Boost_INCLUDE_DIRS which is set to 
>>>> nothing. The weird thing is that find_packages() does successfully say it 
>>>> found boost. I assume something has changed in 1.70.0 with how they’re 
>>>> writing the cmake files but my cmake-fu is very poor.
>>>> 
>>>> To get around it I’m passing the Boost_* variables directly to cmake since 
>>>> externalpackages.cmake mercifully allows that as an option.
>>>> 
>>>> My questions are:
>>>> 
>>>> Any issues with using 1.70.0 or does everybody still use 1.53?
>>>> 
>>>> What are the expected values of the Boost_* variables? I’m passing:
>>>> 
>>>>              -DBoost_VERSION=1.70.0
>>>>              -DBoost_LIBRARIES='boost_filesystem;boost_system;boost_thread’
>>>>              -DBoost_INCLUDE_DIRS=$PREFIX/include
>>>>              -DBoost_LIBRARY_DIRS=$PREFIX/lib
>>>> 
>>>> What should BOOST_ROOT be set to? Seems like OIIO doesn’t care if it’s set.
>>>> 
>>>> Thanks!
>>>> 
>>>>    -Jim
>>>> 
>>>> 
>>>> 
>>>> _______________________________________________
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>>> 
>>> --
>>> Larry Gritz
>>> [email protected] <mailto:[email protected]>
>>> 
>>> 
>>> 
>>> 
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>> 
>> 
>> 
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--
Larry Gritz
[email protected]




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