An interface library can then "link" against other libraries and this interface library can, in turn, be "linked" against. Once the list of dependent libraries is found, they can be installed and modified as necessary (I'd like to work on getting CMake to ship some common utilities for doing so, but don't have a timeline). Only targets that link directly to an object library will have that object library's objects included in its linker command. New in version 3.12: Object libraries can be linked to with target_link_libraries (). There is also file(GET_RUNTIME_DEPENDENCIES) available in 3.15 and newer. At this level, you can introduce dependencies between the individual projects as necessary. Here are some of the things you need to take care of: what artifacts should the library produce at install step where install artifacts should be placed [Solved]-CMake nested OBJECT library dependencies-C++ score:1 Accepted answer Object libraries cannot be chained this way. Scanning dependencies of target vim [ 98%] Building C object src/CMakeFiles/vim.dir/main.c.o [100%] Linking C executable ../bin/vim Starting from cmake 3.13, object libraries can "link" to other libraries to inherit their usage requirements ( doc ). Dependencies (a.k.a link libraries) of a target are just another property and are defined in an INTERFACE or PRIVATE scope. But doing just that would be too easy, wouldn't it. We have now all generated files in place, so let us retry the build. This means that users of JSONUtils don't just require . An INTERFACE library target does not compile sources and does not produce a library artifact on disk. add_executable (helloworldexe helloworld.cpp) (5)target_link_libraries Link the target library (message) to the executable target (Hello World exe). The set of direct link dependencies is then filtered to exclude items named by any dependency's INTERFACE_LINK_LIBRARIES_DIRECT_EXCLUDE target property. So the example CMakeLists.txt from the question should get the correct definition at compile time. Making a library with CMake is not that different from making an application - instead of add_executable you call add_library. Additionally, an ordering dependency will be added to the build sysstem to make sure the object library is up-to-date before the dependent target links. Both objA and objB are OBJECT libraries in CMake. Dependencies added to an imported target or an interface library are followed transitively in its place since the target itself does not build. CMake Options Not all of our training course exercises use the RTOS features, so we decided to control inclusion of the middleware using a CMake option. CMake will ensure the generated build files will take multiple library dependencies into account. Minimal Example: main depends on objB, which depends on objA . With the current CMake versions CMake provides full support for transitive dependencies and interface libraries. See the DEPENDS option of add_custom_target () and add_custom_command () commands for adding file-level dependencies in custom rules. This does not mean that libbig.a contains libA.a and libB.a, only that CMake knows that those have to be linked as well. After that, go one level lower and work on your project as if it was standalone; all dependencies will have been already prepared and ready. Note The target_link_libraries () command should be preferred whenever possible. See also discussion in CMake Issue 15415. We should be able to configure and compile the sources, but we will not be able to link: $ mkdir -p build $ cd build $ cmake .. $ cmake --build . My application require using std::thread from C++11 , when i add the library to the linker in the Cmake file by this way : TARGET_LINK_LIBRARIES( ${execName} -pthread ${ZED_LIBRARIES} ${OpenCV_LIBRARIES} ${CUDA_CUDA_LIBRARY} ${CUDA_CUDAR.CMAKE with QT library CMAKE with QT library.This topic has been deleted.. 1. There are some cases where CMake may ask the linker to search for the library (e.g. The object files associated with an object library may be referenced by the $ generator expression. I created a project with some nested library dependencies using the OBJECTlibrary type. Linking of object libraries is a bit special (and part of the reason I suggest only using them if you really have to - most of the time you really do want a static library instead). You must link directly (not transitively) to an object library to acquire its object files. I would expect main to link with both object files. If you are only linking indirectly to . This does a moreexact calculation than BundleUtilities (but is restricted to the 3 main platforms of today). This is important when your real library is a static library because it can have link dependencies that come from object files in the object library, and only the object library target has the needed INTERFACE_LINK_LIBRARIES on it. See policy CMP0060 for discussion of another case. The buildsystem will have a dependency to re-link <target> if the library file changes. This can be any valid CMake name, and the filename for the compiled library will be that value in your build directory. Specify libraries or flags to use when linking any targets created later in the current directory or below by commands such as add_executable () or add_library (). In our case, both rapidjson and boost optional (defined in the target Boost::boost) have to be interface dependencies and be propagated to users, as they are used in a public header that's imported by clients.. Configure and build the superbuild once to get all projects set up correctly. See the target_link_libraries () command for meaning of arguments. We add the controlling variable with its default value as an option (not a variable set command): Firstly, the first parameter to add_library is the name of the library. If you were to do add_executable (exec $ {srcs}) target_link_libraries (exec big) A and B would be linked in automatically, as CMake tracks the link dependencies, just as the quote states. Share Improve this answer Follow Share Improve this answer Follow answered Jul 5, 2019 at 15:46 You've chosen a tricky situation to get familiar with CMake. New in version 3.3: Allow adding dependencies to interface libraries. I have a simple directory structure as follows: bar bar.c bar.h foo foo.c foo.h main.c CMakeLists.txt It doesn't. 1 Like The motivation for this is to avoid link order issues with static libraries. There is one detail you should be aware of in this case: for shared libraries on Windows, you'll need each OBJECT library to also privately specify the export symbols for dependent OBJECT libraries because they'll end up in the same library and need to know that they come from "the same library" rather than "from outside". target_link_libraries (helloworldexe message) 3, cmake configuration and compilation 1.cmake configuration Don't forget to set cmake_required (VERSION 3.13) if you use this! As it says in the documentation, Interface Libraries add_library (<name> INTERFACE) Creates an Interface Library . Instructs CMake to create a new target: the executable (helloworlddex). Any link dependency may specify additional direct link dependencies using the INTERFACE_LINK_LIBRARIES_DIRECT target property. Such object files are placed on the link line before all libraries, regardless of their relative order. 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