The target should be built from the C++ source file main.cpp. gcc -Ifirst_dir -Isecond_dir -o my_program program.cpp Interestingly, the -I flag tells the compiler to look for files in the directory following the flag. Jay_K: Apparently this is a faq: build static and dynamic libraries. There are three directories involved. $<TARGET_OBJECTS:objlib> .) add_library(particles STATIC randomize.cpp randomize.h particle.cu particle.h v3.cu v3.h ) # Request that particles be built with -std=c++11 # As this is a public compile feature anything that links to # particles will also build with -std=c++11 target_compile_features(particles PUBLIC cxx_std_11) Because the wrong library is used for linking the release version I get build warnings that LIBCMT and LIBCMTD are conflicting. For example, compiling the code in the source file program.cpp that includes the header files first_dir/first_include.h and second_dir/second_include.h needs the following command. add_executable (helloworld main.cpp ) add_executable () tells CMake that we want to build an executable (so not a library) called helloworld as a target. CMake is a cross-platform open-source meta-build system which can build, test and package software. First, create a directory for your project: $ mkdir my_project && cd my_project Next, you'll create the CMakeLists.txt file and declare a dependency on GoogleTest. Here, we define our first target, example_exe. To do so, we will use file command with GLOB_RECURSE parameter. In the add_executable call, we can specify a list of sources needed to build your library or executable. cmake -DCMAKE_INSTALL_PREFIX=~/mylib/install .. The best example I could find was CMake using itself to build. will simply create the file "liblibcool.a" in a Linux environment. c++ compilation cmake shared-libraries Share Follow edited Nov 21, 2017 at 14:28 Jrme Pouiller If you leave this choice off, the value of BUILD_SHARED_LIBS will be used to pick between STATIC and SHARED. Having it, if you now try to find your package in external project ( cmake-library-example/external-project/CMakeLists.txt) like this: find_package (SomeLibrary 0.9.2 CONFIG REQUIRED) In this example the files would be installed in the ~/mylib/install directory: Create and install the shared library's pkg-config file with CMake At this point we built the shared library and installed it system-wide, with the help of CMake. Note that you typically do not list header files here. Last parameter is source. Update: now using modern cmake (version >= 3.9), since commit 46f0b93. You can set the build up so that CMake will download the code directly from its source repo, compile the DLL, and incorporate it into your project as a library target constructed from the build directory, all as a prerequisite to compiling your code. is good practice. if you omit this parameter, library will be static by default. Most examples that I have found compile executables with some shared libraries but never just a plain shared library. Features The main advantage of this example is that it is auto-generated . So it goes without saying that CMake takes care of the naming conventions and extensions for each platform. Now, we can use the library defined in CMakeLists.txt of libtest_project in myapp's CMakeLists.txt: First variable will be called SOURCE_FILES and second HEADER_FILES. add_executable (. Here we have simplified syntax of add_library (<name> [STATIC | SHARED] [<source>.]). In the directory ./Hello, a library is built. add_executable(example_exe main.cpp) Yep, just one line. CMake Examples Introduction. There is even a helper macro for use within FooConfig.cmake, find_dependency. You can use INCLUDE_DIRECTORIES for header location and LINK_DIRECTORIES + TARGET_LINK_LIBRARIES for libraries INCLUDE_DIRECTORIES (your/header/dir) LINK_DIRECTORIES (your/library/dir) rosbuild_add_executable (kinectueye src/kinect_ueye.cpp) TARGET_LINK_LIBRARIES (kinectueye lib1 lib2 lib2 .) add_library + target_link_libraries; add_subdirectory; In modern CMake, add_dependencies option is rarely used and hence I am not adding CMake add_dependencies to the above list. "Hello World" as a library This example shows how to deploy the "Hello World" program as a library and how to link it with other targets. For this program, we have one library (MyLibExample) with a header file and a source file, and one application, MyExample, with one source file. The top level directory has two subdirectories called ./Demo and ./Hello. Set up a project CMake uses a file named CMakeLists.txt to configure the build system for a project. The solution is simple: When linking a shared library to your C application, you need to inform the GCC toolchain about the library you want to link. It isn't fully automated, but compile once is easy enough: add_library (l1-standalone STATIC a.cpp b.cpp) add_library (l1-shared SHARED $<TARGET_OBJECTS:l1-standalone>) set_property (TARGET l1-standalone PROPERTY POSITION_INDEPENDENT_CODE 1) target_include_directories(): To tell CMake that the project directory tree contains headers.In this way, we can have headers from different directories added to each other with a relative path to the project directory. Making a library Making a library is done with add_library, and is just about as simple: add_library(one STATIC two.cpp three.h) You get to pick a type of library, STATIC, SHARED, or MODULE. Let's start by adding the library's directory as a subdirectory to our myapp project. Building a C/C++ unit test (gtest) We use Google Test (gtest) for unit testing of C/C++ code. $<TARGET_OBJECTS:objlib> .) add_library(test SHARED test.c) Linking libraries to executables with CMake. set the variable CMAKE_LIBRARY_PATH set (CMAKE_LIBRARY_PATH path1 path2) find_library (NAMES gtest) the reason is as flowings: Note This command is rarely necessary and should be avoided where there are other choices. Where the library name is the name of the shared library, minus the first lib part and minus the .so file extension. Your directory structure should look like this: Sample test/CMakeLists.txt file add_executable (loadtbb loadtbb.cpp) target_link_libraies (loadtbb $ {TBB_LIBS} ) add_test (loadtbb_test loadtbb) Creating the tbb.cmake file Create an empty file using your favorite text editor called tbb.cmake in the thirdparty directory. To add a library in CMake, use the add_library () command and specify which source files should make up the library. The latter call is needed to tell CMake that the executable testTF depends on the library libTF. Rather than placing all of the source files in one directory, we can organize our project with one or more subdirectories. cmake_minimum_required(VERSION 3.2 FATAL_ERROR) project(OpenGLExample) Source files and libraries Now we will create two CMake variables to hold *.c/*.cpp and *.h/*.hpp source files. In this case, we will create a subdirectory specifically for our library. You only need to change the project name, and add the files that need to be compiled in foo/CMakeLists.txt. 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. target_sources(): to add the source in the currrent directory, app.cpp, to app target. # Almost all CMake files should start with this # You should always specify a range with the newest # and oldest tested versions of CMake. Let us see how add_subdirectory is used to add a dependency. The write_basic_package_version_file () function from above will create SomeLibraryConfigVersion.cmake file in the install folder. I have the problem that the wrong library (debug library) is picked when I create a project file for Visual Studio with CMake. I would start with upgrade of CMAKE version. You'll use this file to set up your project and declare a dependency on GoogleTest. We can have more than one source file. For example, add_library (libcool STATIC .) For example, you can have: add_executable(example_exe Game.cpp ResourceManager.cpp main.cpp) Next is type of library STATIC or SHARED which I explained before. In the directory ./Demo, an executable is built by linking to the library. It would also be helpful if someone could just tell me a very simple library that uses cmake, so I can use this as an example. $<TARGET_OBJECTS:objlib> .) You do this with linker flag: -l<library name>. Example # To create an build target that creates an library, use the add_library command: add_library (my_lib lib.cpp) The CMake variable BUILD_SHARED_LIBS controls whenever to build an static ( OFF) or an shared ( ON) library, using for example cmake .. -DBUILD_SHARED_LIBS=ON. add_executable (. This command, when placed in the root CMake script, declares a subproject test that has its own CMakeLists.txt.. After reloading the changes in both CMakeLists.txt files, CLion creates a Run/Debug configuration for the cmake_testapp . Here's an example that builds a library ( image_loader) and then a gtest to test it: First is name of library for us is HelloLibrary. We can extend our executable from above by linking it to our libray libtest.a. Also, we need to place the add_subdirectory(test) command in the root CMakeLists.txt to make our test target cmake_testapp_boost available for the main build.. For example: add_library (. add_executable(): is to define app target. As an example, if your library depends on Boost.Regex, your FooConfig.cmake.in will look something like this: @PACKAGE_INIT@ find_dependency (Boost 1.60 REQUIRED COMPONENTS regex) include ("$ {CMAKE_CURRENT_LIST_DIR}/FooTargets.cmake") It can be used to support multiple native build environments including make, Apple's xcode and Microsoft Visual Studio. 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. Say we have the same set of source/header files as in the http://www.riptutorial.com/cmake/example/22391/-hello-world--with-multiple-source-files example. Secondly, according to Craig Scott's CMake book, omitting the type argument in add_library (.) cmake-example-library CMake library example that can be found using find_package (). This is a simple yet complete example of a proper CMakeLists. For example: add_library (. Prefer to pass full absolute paths to libraries where possible, since this ensures the correct library will always be linked. There's also the PRIVATE keyword that can be used to avoid adding the settings to all dependent targets. Make sure that you have CMake installed prior to running this example (go here for instructions). 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