And so, if I have an executable (add_executable), the default thing to do is to use target_link_libraries(mylib PRIVATE ...). Not PUBLIC (as I do). Correct ?
----- Mail original ----- > De: "Franck Houssen" <[email protected]> > À: "Rainer Poisel" <[email protected]> > Cc: "CMake Mail List" <[email protected]> > Envoyé: Lundi 8 Janvier 2018 10:41:25 > Objet: Re: [CMake] CMake: using dlopen > > > > ----- Mail original ----- > > De: "Rainer Poisel" <[email protected]> > > À: "Franck Houssen" <[email protected]> > > Envoyé: Dimanche 7 Janvier 2018 19:34:21 > > Objet: Re: [CMake] CMake: using dlopen > > > > Hi, > > > > On Sun, Jan 7, 2018 at 7:13 PM, Franck Houssen <[email protected]> > > wrote: > > > Difference between PUBLIC/PRIVATE has never been clear to me (usually I > > > always use PUBLIC). > > > main.cpp includes dlfcn.h and uses it: not sure to get what you meant > > > (PRIVATE is for templates ? when a header include headers ?) > > > > you are looking for the "Transitive Dependencies" feature of CMake: > > OK, I didn't get that. It's more clear to me now. Thanks ! > > > * > > > > https://cmake.org/cmake/help/v3.0/manual/cmake-buildsystem.7.html#transitive-usage-requirements > > > > Generally speaking and from my personal experience, use the > > target_-commands as much as possible because properties are bound to > > targets and their dependencies rather than a file/directory structure. > > > > So, that means, use target_include_directories(), > > target_compile_options(), target_compile_definitions(), > > target_sources(), ... for your targets. The magic keyword to propagate > > the properties of your targets is target_link_libraries(). Depending > > on what scope (PRIVATE, PUBLIC, INTERFACE) the properties have been > > defined using the other target_-commands, the target_link_libraries() > > command propagates these properties to other targets. E. g. > > > > add_library(otherlib SHARED > > foo.c > > ) > > > > target_include_directories(otherlib PRIVATE > > dirPrivate > > ) > > > > target_include_directories(otherlib PUBLIC > > dirPublic > > ) > > > > add_library(mylib SHARED > > bar.c > > ) > > > > target_link_libraries(mylib PRIVATE > > Is this a typo ? > For the example to work I would have done: target_link_libraries(mylib PUBLIC > otherLib), no ? (mylib needs only PUBLIC stuff's from otherLib but not > PRIVATE one's). Correct ? > > > > otherlib > > ) > > > > In this case, mylib will use all PUBLIC or INTERFACE properties of > > otherlib for its build. Thus, dirPublic will be added to the include > > directory search path for the compilation of bar.c of mylib. PRIVATE > > properties will not be propagated. In the above mentioned example, > > dirPrivate will NOT be added to the include directory search path for > > the compilation of bar.c of mylib. > > > > The example is illustrative (transitivity - PRIVATE is not propagated) > > > This is a very short summary, but I hope it is of help to you. There > > are other ressources on the Internet. E. g. > > * > > > > https://stackoverflow.com/questions/26037954/cmake-target-link-libraries-interface-dependencies > > * https://rix0r.nl/blog/2015/08/13/cmake-guide/ > > > > Regards, > > Rainer > > > -- > > 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
