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

Face Tracking Webcam Software, Community College Electrical Courses Near Hamburg, How To Build A 4 Inch Block Wall, Qlikview Developer Job Description, Best Area To Stay In Barcelona For Young Adults, 3 Types Of Rock Deformation, Bvh Construction Algorithm,