[CMake] CMake: using dlopen

[Konstantin Tokarev]

> ----- Mail original -----
> 
>> De: "Roger Leigh" <rleigh at codelibre.net>
>> À: cmake at cmake.org
>> Envoyé: Samedi 6 Janvier 2018 18:42:11
>> Objet: Re: [CMake] CMake: using dlopen
>>
>> On 06/01/18 17:01, J Decker wrote:
>>> CMake/shared/modules will define the CMAKE_DL_LIBS which a very high
>>> percentage of the time will just be library 'dl' .
> 
> OK. I didn't know that. But if so, why don't you see CMAKE_DL_LIBS when you run "cmake -LA ." and/or when you toggle adanced mode in ccmake ? What's the correct way to see all variables ?

Because cmake -L shows only cached variables, not all variables

> 
>>>
>>> Pretty much any man page on dlopen defines 'dl'
>>
>> On Linux. On MaxOSX and FreeBSD not at all, where the dl functions are
>> in libSystem and libc, respectively. Using CMAKE_DL_LIBS does the right
>> thing on all platforms (though I wish it was an imported target to make
>> exports a bit nicer).
> 
> OK, thanks. So, I go with: target_link_libraries(main PUBLIC ... ${CMAKE_DL_LIBS})
> 
>> Regards,
>> Roger
>> --
>>
>> Powered by www.kitware.com
>>
>> Please keep messages on-topic and check the CMake FAQ at:
>> http://www.cmake.org/Wiki/CMake_FAQ
>>
>> Kitware offers various services to support the CMake community. For more
>> information on each offering, please visit:
>>
>> CMake Support: http://cmake.org/cmake/help/support.html
>> CMake Consulting: http://cmake.org/cmake/help/consulting.html
>> CMake Training Courses: http://cmake.org/cmake/help/training.html
>>
>> Visit other Kitware open-source projects at
>> http://www.kitware.com/opensource/opensource.html
>>
>> Follow this link to subscribe/unsubscribe:
>> https://cmake.org/mailman/listinfo/cmake
> 
> --
> 
> Powered by www.kitware.com
> 
> Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ
> 
> Kitware offers various services to support the CMake community. For more information on each offering, please visit:
> 
> CMake Support: http://cmake.org/cmake/help/support.html
> CMake Consulting: http://cmake.org/cmake/help/consulting.html
> CMake Training Courses: http://cmake.org/cmake/help/training.html
> 
> Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html
> 
> Follow this link to subscribe/unsubscribe:
> https://cmake.org/mailman/listinfo/cmake
-- 
Regards,
Konstantin