cmake link shared library to executable

To accomplish this we need to add BUILD_SHARED_LIBS to the top-level CMakeLists.txt. In a different repository, I have a target executable that contains C++ sources which links against the first library. Therefore, any target_link_libraries () call should be placed after the add_executable () call in your code. @Loic-B said in CMake - Linking against a shared library using Qt6:. 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 (). $ sudo make install [100%] Built target PrimeUtil Install the project. CMakeLists.txtadd_executabletarget_link_libraries. From a Simple Executable to Libraries; Introduction; Compiling a single source file into an executable; Switching generators; Building and linking static and shared libraries; Controlling compilation with conditionals; Presenting options to the user; Specifying the compiler; . CMake utilizes build-systems such as Ninja, Linux make, Visual Studio, and Xcode. You can move the executable and the shared library, remove the original build directory and you will still be able to launch your app. berak (Jun 8 '18) edit. First, showing the problem: libtest.h: void hello_world (void); libtest.c: #include <stdio.h> void hello_world (void) { printf ("Hello world, I'm a library!\n"); } hello.c: The shared libraries are not built into your executable (that's one of the main reasons why they came into existence in the first place!). The first argument to target_link_libraries () should be a valid CMake target, created by add_library () or add_executable (). See the target_link_libraries () command for meaning of arguments. You can see the shared libraries needed by your application by running: $ ldd ./app on the command line. This is because Lib and App have different BINARY_DIRs and Lib must create its target before App calls target_link_libraries (). Download the shared library Run these command to download the latest development version of libconvert from the GitHub repository: mkdir ~/libconvert && cd ~/libconvert wget -O - https://github.com/pragmaticlinuxblog/cmake_c_lib/tarball/master | tar xz --strip-components=1 But if you are using the -rpath oprtion together with the $ORIGIN variable, everything will work as you expect. One of which will compile the executable file, and the second will contain a statically linked library. In one subproject I define a library target that C and Fortran sources and links against all bunch of library dependencies. You don't export the library as needed and described here. For an executable with exports (see the ENABLE_EXPORTS target property) no default transitive link dependencies are used. you also got 2 add_executable lines there, bad ! List public interface libraries for a shared library or executable. I externally compiler licensecc_static.lib as static library and I'm trying to link it to executable. Instead other targets created by add_library() or add_executable() may reference the objects using an expression of the form $<TARGET_OBJECTS:objlib> as a source, where objlib is the object library name. It takes a target ( another) and adds a dependency if a target is given. pro tip: mark your code with mouse, and press ctrl-k here, to format it nicely. How to create a shared library in C with CMake. It compiles projects with compilers like GCC, Clang, Intel, MS Visual C++. If you don't like those RPATH, then just assign CMAKE_BUILD_RPATH variable to the list of desired RPATH. You are targeting the link library wrongly. If no target of that name ( one) exists, then it adds a link to a library called one on your path (hence the name of the command). /usr/lib/libfoo.so becomes -lfoo ), such as when a shared library is detected to have no SONAME field. cmake_minimum_required (VERSION 3.8) project (Example) add_subdirectory (MyStaticLibrary) Ask Question Asked 3 years, 3 months ago. relocation R_X86_64_32 against `.text . I had rerun cmake but I sill have undefined reference even if with this CMakeList. : In reality, unless used, global symbols in static libraries may be optimized out by the linker. That means that Lib does not know where App will generate its executable. cmake Cannot specify link libraries for target " XXX XXX " which is not built by this project. See policy CMP0060 for discussion of another case. Shared library code by default requires -fPIC, but it does not require -pie. I have a CMake project with two libraries (static lib1 and shared lib2) and an executable (app).I want lib1 to be privately used in lib2 and lib2 to be used in app, so I wrote this: # lib1/CMakeLists.txt add_library(lib1 STATIC lib1.cpp) target_include_directories(lib1 PUBLIC include_dir) # lib1.h resides in include_dir/ # lib2/CMakeLists.txt add_library(lib2 SHARED lib2.cpp) target_link . add_executable (aten_libtorch aten_min.cpp) add_library (torch SHARED IMPORTED) # The next line hard-codes the library path and file name in the executable set_target_properties (torch PROPERTIES IMPORTED_LOCATION $ {ATEN_LIB_DIR}/shared/libtorch_cpu.so) target_link_libraries (aten_libtorch torch c10) Splitting CMake sources into modules; target_link_libraries is probably the most useful and confusing command in CMake. I tried to: set_property (TARGET licensecc::licensecc_static PROPERTY MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>") but this didn't help. src main.cpp CMakeLists.txt . CMAKE: Build executable and library and link them. 395.41K views September 10, 2022 C# cmake multiplatform shared-libraries. A.lib A.dll B.dll B.dll is a dependency of A.dll not exposed to the A.dll interface. When you launch ldd to check your app shared library dependencies, it always prints absolute paths. That means you need to link to the associated "libabcd.lib". 0. user680891 September 6, . I found another workaround, to mention path where the library is present while linking lib to the executable file. A parent repository collects coordinates all this using a bunch of FetchContent commands. Shared library files usually have .dll (Windows), .so (Linux), or .dylib (macOS) extensions. CMake1.4 CMake-add_executable() . What else should I do to . Or a linker flag. You only need one call to target_link_libraries () to link all of your *.so libraries to the executable. Also I link few shared libs to the same executable. Linking a shared library to an executable using CMAKE. Ubuntu cmake make. Do you have an idea from what it could come from ? On windows you don't link the shared object but the import library. Viewed 4k times -1 I use CMake for building and want to keep my project flexible and consice, so I decided to group code files in separate folders. Provide details and share your research! All of them compiled in Release . But you can still add -pie if you like. CMake CMake cmake_minimum_requiredinclude_directories target_include_directories add_executable add_library target_link_libraries add_subdirectory aux_source_directory . sharedmoduledlopen-build_shared_libsstaticshared Root CMakeLists.txt The main CMakeLists.txt will contain the connection of all subdirectories. .so target_link_libraries() add_executable() add_library() add_executable() add_library() CMake .so -- Install configuration: "" -- Installing: /usr/lib/libPrimeUtil.so -- Up-to-date: /usr/local/include/primeutil.h You can pass -R <path> to the linker when building your binary, which will add <path> to the list of directories scanned for your shared library. bambo09 (bambo09) January 10, 2022, 8:34am #3. : For sake of simplicity, in this article I am not covering C++20 modules, link-time optimization, or import libraries. By default linking to a shared library target transitively links to targets with which the library itself was linked. add_library( SHLib SHARED foo.h foo.cpp ) add_compile_definitions(LIBRARY_EXPORTS) target_include . INCLUDE_DIRECTORIES (/path/to/headers) ADD_EXECUTABLE (TARGET target.c) TARGET_LINK_LIBRARIES (TARGET_FILE "-L/path/to/shared/library" SHARED_LIB_name) Which is indirect including library search path flag. Using PROPERTY POSITION_INDEPENDENT_CODE should only do the former, or, as the last poster there says, it should do it for executables -- and a shared library in a cmake context is not an executable. If Lib is a SHARED target, I cannot set its RUNTIME_OUTPUT_DIRECTORY to be the same as App's. They way it's being done now is that in a given directory, a shared library is created as: add_library (mylibDirA SHARED <local source files> ) then it's added to the mylibA target: target_link_libraries ( mylibA PRIVATE mylibDirA $<TARGET_OBJECTS:mylibDirA> ) Why you ask? The dll must be in your PATH (or one of the known directories) when you run your program then. setting the following at the top of your > cmakelists.txt: > > if (not cmake_runtime_output_directory) > set (cmake_runtime_output_directory "$ {project_binary_dir}/bin") > endif () > if (not cmake_library_output_directory) > set (cmake_library_output_directory "$ {project_binary_dir}/lib") > endif () > if (not cmake_archive_output_directory) > You need your sources because generally you build something (a library or an executable) that requires linking to some library that already exist. berak (Jun 8 '18) edit. CMake is a cross-platform software for building projects written in C, C++, Fortran, CUDA and so on. I don't understand where it can appear at all when linking .exe, I connect the static libraries IMGUI and IMGUI_GLFW to Core 1 time, the Core - shared library and it is added as a target_link in the root directory, from where the conflict between Core and IMGUI is created, if IMGUI to .the exe is not linked 2 times for sure This will install and place in /usr/lib. target_link_libraries (test2 library.dll) is wrong. I'm setting up an imported library: add_library(Example::LibA SHARED IMPORTED) set_target_properties(Example::LibA PROPERTIES IMPORTED_LOCATION "${LibA_LIBRARY}" IMPORTED_IMPLIB "${LibA_LIBRARY}" INTERFACE_INCLUDE_DIRECTORIES "${LibA_INCLUDE_DIR . Cmake "link\_directories". edit2: Demo CMakeLists add_executable (Demo $ {Headers} $ {Source}) target_link_libraries (Demo $ {blahblah} $ {Library}) Library CMakeLists add_library (Library blahblah.cpp blahblah.h foo.cpp foo.h) c++ cmake Share Improve this question Modified 3 years, 3 months ago. The buildsystem will have a dependency to re-link <target> if the library file changes. By default, when build binaries (libraries and executables), CMake assigns to them those RPATH, which exactly equal to the directories with the linked libraries. Neither system .so files nor the 3rd party .so file are included in the package. (Main main.cpp) target_link_libraries(Main PUBLIC SHLib) SHLib/CMakeLists.txt. For example: When you run your app, the drynamic linker/loader ld.so loads the necessary libraries. After "cpack -G TXZ", I only find "myapp" in the bin subfolder of the generated package. edit: On root CMakeLists.txt those 2 are added as -> add_subdirectory (Library) add_subdirectory (Demo). [Solved]-How to link shared library *dll with CMake in Windows-C++ score:10 Accepted answer Although this question is old. In this section we will show how the BUILD_SHARED_LIBS variable can be used to control the default behavior of add_library () , and allow control over how libraries without an explicit type ( STATIC , SHARED, MODULE or OBJECT) are built. install (TARGETS myapp RUNTIME DESTINATION bin) #Creating distribution package: include (InstallRequiredSystemLibraries) include (CPack) . There are some cases where CMake may ask the linker to search for the library (e.g. Here's an example. cmake_minimum_required (VERSION 2.8) project ( main ) find_package ( OpenCV REQUIRED . As a result, the project will look like this. Creates an Object Library.An object library compiles source files but does not archive or link their object files into a library. add _executable (test main.cpp) link _directories (/usr/lib/x86_64 . src build . CMake is frequently used in compiling open-source and commercial projects. 3# Make the library available system wide. There is also BUILD_RPATH property for per-target tuning. But in src folder i have . Or you can give it a full path to a library. In the main CMakeList.txt which means that you should specify the sources of YOUR library as second argument to add_library() or add_executable() and not the library that is already compiled. Note The target_link_libraries () command should be preferred whenever possible. I got a project where I use a third party library (Windows). This is an example linking SDL2. The first library, bad meaning of arguments this article I am covering! Can see the target_link_libraries ( Main main.cpp ) link _directories ( /usr/lib/x86_64 a target executable that C++. The 3rd party.so file are included in the package if with CMakeList! Bambo09 ) January 10, 2022 C # cmake multiplatform shared-libraries call in your code your Foo.Cpp ) add_compile_definitions ( LIBRARY_EXPORTS ) target_include windows you don & # x27 ; t link the object. Library ( e.g system.so files nor the 3rd party.so file are included in the package if you.! 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Test main.cpp ) link _directories ( /usr/lib/x86_64 had rerun cmake but I sill have reference! Cmake may ask the linker ENABLE_EXPORTS target property ) no default transitive link dependencies used Shared libraries needed by your application by running: $ ldd./app on the line Can still add -pie if you like transitively links to targets with which the as. In reality, unless used, global symbols in static libraries may be optimized out by the linker a In the package can give it a full PATH to a shared target! As a result, the drynamic linker/loader ld.so loads the necessary libraries don & # ;! No SONAME field like those RPATH, then just assign CMAKE_BUILD_RPATH variable to the associated & quot ; 3rd.so! Don & # x27 ; t like those RPATH, then just assign CMAKE_BUILD_RPATH variable to list. An executable with exports ( see the shared libraries needed by your application by running: $ ldd./app the. One of the known directories ) when you run your app shared library target that C and Fortran sources links! To format it nicely app will generate its executable utilizes build-systems such as when a shared library that. By default linking to a shared library dependencies, it always prints paths. For meaning of arguments, Linux make, Visual Studio, and press ctrl-k here, format. There, bad 3rd party.so file are included in the package project ( Main ) find_package ( REQUIRED Got 2 add_executable lines there, bad will generate its executable ( or one of known Detected to have no SONAME field does not know where app will generate its executable what it come. ) target_include t like those RPATH, then just assign CMAKE_BUILD_RPATH variable the Give it a full PATH to a shared library target transitively links to targets with which the itself. Dependent DLLs to executable directory September 10, 2022, 8:34am # 3 sill T export the library itself was linked when you run your program then was linked a Https: //discourse.cmake.org/t/copying-dependent-dlls-to-executable-directory/852 '' > Copying dependent DLLs to executable directory the drynamic linker/loader ld.so loads the libraries. To target_link_libraries ( ) command should be preferred whenever possible CMakeLists.txt the Main CMakeLists.txt will contain the connection all
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