Re: [Boost-cmake] disabling particular external dependencies

Subject: Re: [Boost-cmake] disabling particular external dependencies
From: Sean Chittenden (sean_at_[hidden])
Date: 2009-11-04 20:11:54

> btw, the new cmake boost 1.41 imports look *very* good so far.  The  
> INSTALL_VERSIONED=ON broke a few things on my first pass, but all  
> due to path issues.
>
> I'd ideally like to make use of BOOST_INSTALL_CMAKE_DRIVERS and  
> INSTALL_VERSIONED.  Is the intention to just include lib/Boost.cmake  
> and have it take care of all of the pathing and version information  
> depending on the results of find_package(Boost 1.41...) or some  
> such?  If lib/Boost.cmake can support multiple versions of boost  
> installed, it would be *ideal* if the effort required to use boost  
> were as simple as:
>
> set(Boost_USE_MULTITHREADED ON)
> set(Boost_MIN_VERSION 1.41)
> set(Boost_SET_INCLUDE ON)    # Should default to ON, same concept  
> for linker flags
> include("${CONTRIBOBJ}/lib/Boost.cmake")
> find_package(Boost ${Boost_VERSION} COMPONENTS thread NO_MODULE)
> # no need for include(${Boost_INCLUDE_DIR}) with Boost_SET_INCLUDE=ON

Err...  1.41.0 builds smoothly, but I'm having issues integrating  
boost with cmake 2.6.4.  Looking for "the right way" to do things.

If I'm using a custom installation root, do I use find_package 
(Boost...) or include(".../BoostConfig.cmake") ?  It's installed in to  
the custom root, not just built but uninstalled.

CMakeLists.txt:
> set(WANT_BOOST_VERSION 1.41.0)
> set(Boost_USE_STATIC_LIBS   ON)
> set(Boost_USE_MULTITHREADED ON)
> set(Boost_DEBUG TRUE)
>
> find_package(Boost ${WANT_BOOST_VERSION} REQUIRED date_time graph  
> program_options regex signals system thread unit_test_framework  
> NO_MODULE)
> # include("${CONTRIBOBJ}/share/boost-${WANT_BOOST_VERSION}/cmake/ 
> BoostConfig.cmake")
> if(Boost_NOTFOUND)
>   message(FATAL_ERROR "Boost not found")
> endif()

If you use include() + find_package() you get a bunch of the following  
(know it's my fault, but FYI):

Output:
> --  found: Boost
> globbed: ../../boost-1.41.0//cmake//BoostConfig.cmake
> CMake Error at obj/contrib-Darwin-i386/lib/boost-1.41.0/Boost.cmake: 
> 16 (ADD_LIBRARY):
>   add_library cannot create imported target "boost_date_time-mt- 
> static"
>   because another target with the same name already exists.
> Call Stack (most recent call first):
>   obj/contrib-Darwin-i386/share/boost-1.41.0/cmake/BoostConfig.cmake: 
> 28 (include)
>   cmake/setup_boost.txt:28 (include)
>   cmake/setup_contrib.txt:19 (INCLUDE)
>   CMakeLists.txt:16 (INCLUDE)
>
>
> CMake Error at obj/contrib-Darwin-i386/lib/boost-1.41.0/Boost.cmake: 
> 19 (ADD_LIBRARY):
>   add_library cannot create imported target "boost_date_time-mt- 
> shared"
>   because another target with the same name already exists.
> Call Stack (most recent call first):
>   obj/contrib-Darwin-i386/share/boost-1.41.0/cmake/BoostConfig.cmake: 
> 28 (include)
>   cmake/setup_boost.txt:28 (include)
>   cmake/setup_contrib.txt:19 (INCLUDE)

If I use include(".../BoostConfig.cmake") instead, it obviously  
doesn't populate Boost_LIBRARIES because there weren't any COMPONENTS  
specified:

> Linking CXX executable ../obj/contrib-Darwin-i386/bin/foo_unittests
> Undefined symbols:
>   "boost::test_tools::print_log_value<char const*>::operator() 
> (std::basic_ostream<char, std::char_traits<char> >&, char const*)",  
> referenced from:
>       std::basic_ostream<char, std::char_traits<char> >&  
> boost::test_tools::tt_detail::operator<< <char const*> 
> (std::basic_ostream<char, std::char_traits<char> >&,  
> boost::test_tools::tt_detail::print_helper_t<char const*> const&) in  
> foo_unittests.cc.o
>   "boost::unit_test::unit_test_log_t::set_checkpoint 
> (boost::unit_test::basic_cstring<char const>, unsigned long,  
> boost::unit_test::basic_cstring<char const>)", referenced from:
>       test_foo::test_method()       in foo_unittests.cc.o

I can populate the list of libs that I need by hand, but am looking  
for guidance on what's the right way forward.

Is there a correct way to use find_package(Boost...) with an installed  
1.41.0 atm?  I notice Boost_VERSION is set as a string in  
BoostConfig.cmake but the older FindBoost.cmake that comes with cmake  
2.6.4 is expecting an integer.  -sc

--
Sean Chittenden
sean_at_[hidden]