Hello, glad that could help you. For your newer problem, you don't describe them, so it's tough to know what kind of problems you're facing. Maybe a small example of your CMakeLists.txt + a capture of the error cmake gives you could help ?
David On Fri, Sep 21, 2018 at 4:52 PM Ke Gao <ke.gao...@gmail.com> wrote: > > Thank you all for the help. > > I finally use a way quite similar to David's first approach. I first generate > all sub-projects into object libraries using add_library(lib1 OBJECT > SOURCES). Then in the final library, I use add_library(single_static_lib > STATIC SOURCES) and target_link_libraries( single_static_lib lib1 lib2 ...). > Note that I didn't use " $<TARGET_OBJECTS:lib1>" in the final "add_library" > and also didn't use "PUBLIC" keyword in the final "target_link_libraries". It > works on CMake v3.12.2 and gives me a single static lib which combines all > the objs I want. > > But currently I still have problems of further combining third party static > libraries into the final generated static single_static_lib. Can anybody > provide a solution for this? > > Thank you very much. > > Ke > > On Fri, Sep 21, 2018 at 6:15 AM Deniz Bahadir <dbaha...@benocs.com> wrote: >> >> Am 21.09.2018 um 09:33 schrieb David Jobet: >> > Hello, >> > >> > I had a similar issue lately and wanted to "pack" several static libs >> > into a dynamic one. (Not even talking about an INTERFACE lib since I >> > really wanted that .so) >> > I made it work with 3 different solutions, none of them being "clean" >> > from my point of view. >> > >> > 1- OBJECT libs on sub projects : add_library(lib1 OBJECT SOURCES) and >> > for the single static lib : add_library(single_static_lib STATIC >> > $<TARGET_OBJECTS:lib1> ...) >> > Problem I faced : since OBJECT libs do not support >> > target_link_libraries(), I had to remove the existing one and move >> > them instead to the target_include_directories() using generators. >> >> This is no longer true. Since CMake 3.12 `target_link_libraries` fully >> supports OBJECT libraries. You just need to pay attention to the special >> case of linking an OBJECT library with keyword "PUBLIC". (Object-files >> are always private and inherited object-files are therefore never >> further inherited. See: >> https://cmake.org/cmake/help/v3.12/command/target_link_libraries.html#linking-object-libraries) >> >> > e.g : target_include_directories(lib1 PUBLIC >> > $<TARGET_PROPERTY:another_lib,INCLUDE_DIRECTORIES>) >> > Because I had a dependency to a protobuf generated lib, I also had to >> > add manual add_dependencies to respect proper build order. >> > Not clean at all >> > >> > 2- add_library(mysharedlib STATIC CMakeLists.txt) >> > target_linked_libraries(mysharedlib PUBLIC lib1 ...) >> > Maybe the cleanest way I found. >> > The trick with CMakeLists.txt is that add_library needs at least one >> > source file. You can put any kind of files you want. CMakeLists.txt is >> > not compilable, so no extra compilation step, no need for dummy empty >> > source file and add_library is happy. >> > It did not work in my case because of problems related to how our .so >> > are used/generated. (problems at runtime with duplicated symbols in >> > protobufs) >> > >> > 3- a variation around 1 >> > instead of defining OBJECT libs, define a variable holding all the >> > sources for lib1, another for lib2, ... >> > then just do add_library(mysharedlib STATIC ${SOURCES_FOR_lib1} >> > ${SOURCES_FOR_lib2}) >> > It works a little bit like 1) but does not have any of its problems >> > (target_link, add_dependencies, generators, ...) >> > It has new problems of its own though : if your libs live in different >> > subfolders, the variables might not be visible from your >> > add_library(mysharedlib...) call. >> > To work around that, you can use PARENT_SCOPE (not sure if that works >> > accross several levels), or includes (defines those variables into >> > separate files living in each subfolders and include them in the >> > parent CMakeLists). >> > >> > Hope this helps (and I'd be happy to know of other ways) >> > >> > David >> > On Thu, Sep 20, 2018 at 5:45 PM Ke Gao <ke.gao...@gmail.com> wrote: >> >> >> >> Hi, >> >> >> >> I have a project which includes many sub-projects. Each sub-project >> >> generates a static library. In the main project, I want to combine the >> >> generated objs, generated static libraries from other sub-projects, and >> >> some other third party static libraries together into a single static >> >> library. Is there an elegant way to do this, or maybe an existing >> >> function? >> >> >> >> Thank you very much. >> >> >> >> -- >> >> .............................................................................................................................................. >> >> Ke Gao >> >> >> Hope that information was of value, >> Deniz >> >> -- >> >> 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 > > > > -- > .............................................................................................................................................. > Ke Gao -- 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
