Note that this command [ link_directories] is rarely necessary. When it comes to target_include_directories and target_link_libraries, there are several keywords, PUBLIC, PRIVATE, and INTERFACE, that I got confused about from time to time even if I have read the related official documentations. Repeated calls for the same <target> append items in the order called. This means that when you build, you create a separate directory (folder), and build there, not in the same directory that contains the source code. This is how you do CMake. Each item specifies a link directory and will be converted to an absolute path if necessary before adding it to the relevant property. UNSET (CMAKE_C_IMPLICIT_LINK_DIRECTORIES) but the same fix does not work for the entire library, as implicit libraries still get built and the spurious links happen anyway. A library target name: The generated link line will have the full path to the linkable library file associated with the target.The buildsystem will have a dependency to re-link <target> if the library file changes.. Thus in CMake there are two sets of variables that refer to directories: one for the source code, and another for the binary code. See the cmake-generator-expressions(7)manual for available expressions. When a library in one of these directories is given by full path to target_link_libraries()CMake will generate the -l<name>form on link lines to ensure the linker searches its implicit directories for the library. Relative paths given to this command are interpreted as relative to the current source directory, see CMP0015. The idea is that you build modules in CMake, and link them together. # enter your project directory $ cd myproject # it is always a good idea to not pollute the source with build files # so create a new build directory $ mkdir build $ cd build # run cmake and make $ cmake -DCMAKE_BUILD_TYPE=Release .. $ make # if you have tests, then the following $ ctest This has worked well for us on Linux and MacOS. First, you use include_directories () to tell CMake to add the directory as -I to the compilation command line. link_directories ([AFTER|BEFORE] directory1 [directory2 .]) If the library is header-only there is no need to link. - I cannot change the name of directories of alib in any way. CMake doesn't know that these can be relocated. Contents of INTERFACE_LINK_DIRECTORIES may use "generator expressions" with the syntax $<.>. 123099 (Alex Khazov) April 23, 2020, 11:37pm #1 Hello, I have very little experience with CMake and I am trying to set up a simple library. Unfortunately, CMake does not encourage this, you should instead link the actual library you want target_link_libraries (main /my/awesome/lib.so) There is also another way to link directories. However, in order for CMake to locate your header files during compile time, you need to add the include_directories () command to your CMake build script and specify the path to your headers: add_library (.) However cmake does not respect this order and appends the include directories from the call of target_link_libraries in the end of the command line, resulting in the system headers being picked up instead of my alib version headers. You'll need to remake them in your hash-config.cmake file using the install-time locations (which you can implement by doing a find_library ). The CMAKE_CONFIGURE_DEPENDS usage is similar to that of LINK_DEPENDS requiring a semi-colon separated list but this time containing filenames relative to a given directory: set (FILES config.yml) set__property (DIRECTORY $ {CMAKE_SOURCE_DIR} APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS "$ {FILES}" ) Using Subsystems These paths are implicit linker search directories for the compiler's language. 1 Like Pass these absolute library file paths directly to the target_link_libraries () command. .) PUBLIC and INTERFACE items will populate the INTERFACE_LINK_DIRECTORIES property of <target> ( IMPORTED targets only support INTERFACE items). Each <item> may be: I have tried: Unsetting the implicit cmake variables as I've shown in the beginning of the cmake configuration Same thing but setting to "" with SET ( "") link_directories Add directories in which the linker will look for libraries. Compilers typically pass directories containing language runtime libraries and default library search paths when they invoke a linker. The directories you pass to this command are used you pass something that's not a cmake target to target_link_libraries. When target dependencies are specified using target_link_libraries () , CMake will read this property from all target dependencies to determine the build properties of the consumer. An example of this would be creating a CMake target for image manipulation. This means that all they have to do to use jsonutils is this: find_package(JSONUtils 1.0 REQUIRED) target_link_libraries(example JSONUtils::JSONUtils) To achieve this we need to do two things. Even the manpage specifically advises against it: Note that this command [link_directories] is rarely necessary. A library target name: The generated link line will have the full path to the linkable library file associated with the target.The buildsystem will have a dependency to re-link if the library file changes.. FindPkgConfig uses the architecture-appropriate pkgconfig file, but only when not cross-compiling, which I am. include_directories (src/main/cpp/include/) CMake automatically detects these directories for each language and reports the results in this variable. Let's ignore header files for now, as they can be all included in your source files. [.] Adds the paths in which the linker should search for libraries. link_directories (/my/libs/dir) Check the official documentation ( https://cmake.org/cmake/help/git-stage/command/target_link_directories.html) Share I usually don't use link_directories command. # Specifies a path to native header files. As stated in the CMake documentation for INTERFACE_INCLUDE_DIRECTORIES, all the targets look at the INTERFACE_INCLUDE_DIRECTORIES property of linked targets, and use whatever directories are declared as search paths. All of them have the general form target_link_libraries (<target> . The best way, IMO, is to make an IMPORTED target that represents these. Each <item> may be: . Everything compiles, builds, and runs fine. Keep that in mind. CMake will ensure the linker finds them. Note This command is rarely necessary and should be avoided where there are other choices. However to create a binary you need to link with the compiled A. target_include_directories tells cmake where to find the API header files so you can include them from B. target_link_directories and target_link_libraries tell cmake where to find the library's compiled code. As an example, if your project's sources are in src, and you need headers from include, you could do it like this: <item>. The gist is this: Using target_link_libraries to link A to an internal target B will not only add the linker flags required to link to B, but also the definitions, include paths and other settings - even transitively - if they are configured that way. We want jsonutils to integrate in a target-based build system of downstreams. 14 comments Contributor Wohlstand commented on Dec 13, 2021 mentioned this issue Fixed build on CMake older than 3.13 and 3.7 in 3861afa on Dec 18, 2021 Sign up for free to join this conversation on GitHub . Each may be:. Library locations returned by find_package () and find_library () are absolute paths. Do not use link_directories like this in CMake. CMAKE_<LANG>_IMPLICIT_LINK_DIRECTORIES Implicit linker search path detected for language <LANG>. tambre (Raul Tambre) December 19, 2019, 9:23am #4 With CMake, you generally do out of source builds . When you install, your target will reference these imported targets. See the cmake-buildsystem(7)manual for more on defining buildsystem properties. If you specify a full path for a library in the target_link_libraries command, it will add the library name with its full path into the library files field. My answer was: use target_link_libraries with debug and optimized keywords or use link_directories. Cmake link_directories,cmake,Cmake, ABC A rootdir/B.lib rootdir/C.lib BEF rootdir/E rootdir/F E . Of course, it's all in the CMake documentation, but mentioned implicitly at best. See the cmake-generator-expressions (7) manual for available expressions. You can use the get_property command to retrieve the value of the directory property INCLUDE_DIRECTORIES Something like this: get_property (dirs DIRECTORY $ {CMAKE_CURRENT_SOURCE_DIR} PROPERTY INCLUDE_DIRECTORIES) foreach (dir $ {dirs}) message (STATUS "dir='$ {dir}'") endforeach () The include_directories () link_directories () unfortunately doesn't seem to add the directories to the final link command. Second, you list the headers in your add_executable () or add_library () call. This is a common beginner's mistake, as many other build environments work like this, but in CMake it's just asking for trouble. You add them to your project with: ADD_LIBRARY (LibsModule file1.cpp file2.cpp ) Now you added them to a module called LibsModule. The library depends on other external libraries and adds them using the add_subdirectory and target_link_library commands. The named target must be created by add_library() within the project or as an IMPORTED library.If it is created within the project an ordering dependency will . CMake is one of the most convenient building tools for C/C++ projects. Cmake Link Directories And Target Link Libraries Cmake target_link_libraries CMake 3.24.2 Documentation. Arguments to target_link_directoriesmay use "generator expressions" with the syntax $<.>. Say you have file1.cpp, file2.cpp, main.cpp. From the docs of target_link_libraries This command has several signatures as detailed in subsections below.
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