With the current CMake versions CMake provides full support for transitive dependencies and interface libraries. But doing just that would be too easy, wouldn't it. The object files associated with an object library may be referenced by the $ generator expression. I have a simple directory structure as follows: bar bar.c bar.h foo foo.c foo.h main.c CMakeLists.txt The set of direct link dependencies is then filtered to exclude items named by any dependency's INTERFACE_LINK_LIBRARIES_DIRECT_EXCLUDE target property. If I specify a dependency chain of OBJECT libraries in CMake, only the target_link_libraries dependencies of the very last one is used in the target executable. CMake will ensure the generated build files will take multiple library dependencies into account. It doesn't. 1 Like As it says in the documentation, Interface Libraries add_library (<name> INTERFACE) Creates an Interface Library . 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. 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). There are some cases where CMake may ask the linker to search for the library (e.g. 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. Note The target_link_libraries () command should be preferred whenever possible. Such object files are placed on the link line before all libraries, regardless of their relative order. Dependencies added to an imported target or an interface library are followed transitively in its place since the target itself does not build. At this level, you can introduce dependencies between the individual projects as necessary. Dependencies (a.k.a link libraries) of a target are just another property and are defined in an INTERFACE or PRIVATE scope. An interface library can then "link" against other libraries and this interface library can, in turn, be "linked" against. Firstly, the first parameter to add_library is the name of the library. Don't forget to set cmake_required (VERSION 3.13) if you use this! /usr/lib/libfoo.so becomes -lfoo ), such as when a shared library is detected to have no SONAME field. See also discussion in CMake Issue 15415. 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. This means that users of JSONUtils don't just require . You must link directly (not transitively) to an object library to acquire its object files. See the DEPENDS option of add_custom_target () and add_custom_command () commands for adding file-level dependencies in custom rules. 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 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". 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. I would expect main to link with both object files. Configure and build the superbuild once to get all projects set up correctly. add_executable (helloworldexe helloworld.cpp) (5)target_link_libraries Link the target library (message) to the executable target (Hello World exe). See policy CMP0060 for discussion of another case. New in version 3.12: Object libraries can be linked to with target_link_libraries (). This can be any valid CMake name, and the filename for the compiled library will be that value in your build directory. Only targets that link directly to an object library will have that object library's objects included in its linker command. There is also file(GET_RUNTIME_DEPENDENCIES) available in 3.15 and newer. 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. 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.. Share Improve this answer Follow answered Jul 5, 2019 at 15:46 [Solved]-CMake nested OBJECT library dependencies-C++ score:1 Accepted answer Object libraries cannot be chained this way. 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. Instructs CMake to create a new target: the executable (helloworlddex). 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 . Making a library with CMake is not that different from making an application - instead of add_executable you call add_library. If you are only linking indirectly to . See the target_link_libraries () command for meaning of arguments. Scanning dependencies of target vim [ 98%] Building C object src/CMakeFiles/vim.dir/main.c.o [100%] Linking C executable ../bin/vim 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 We have now all generated files in place, so let us retry the build. An INTERFACE library target does not compile sources and does not produce a library artifact on disk. So the example CMakeLists.txt from the question should get the correct definition at compile time. Both objA and objB are OBJECT libraries in CMake. I created a project with some nested library dependencies using the OBJECTlibrary type. We add the controlling variable with its default value as an option (not a variable set command): Starting from cmake 3.13, object libraries can "link" to other libraries to inherit their usage requirements ( doc ). 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've chosen a tricky situation to get familiar with CMake. New in version 3.3: Allow adding dependencies to interface libraries. 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 (). target_link_libraries (helloworldexe message) 3, cmake configuration and compilation 1.cmake configuration Any link dependency may specify additional direct link dependencies using the INTERFACE_LINK_LIBRARIES_DIRECT target property. Why quotation marks? Minimal Example: main depends on objB, which depends on objA . This does a moreexact calculation than BundleUtilities (but is restricted to the 3 main platforms of today). The buildsystem will have a dependency to re-link <target> if the library file changes.
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