cmake library example

Building a library and an executable that uses it. This is basically intended as a series of reminders to help me remember how to use CMake . This guide and the complete example source code can be found in the Help/guide/importing-exporting directory of the CMake source code tree. Let's look at Boost for an example. Exercise 1 - Creating a Library To add a library in CMake, use the add_library () command and specify which source files should make up the library. add_executable() tells CMake that we want to build an executable (so not a library) called helloworld as a target. The configurations will be set in the file config.hpp.in which will be preprocessed to config_impl.hpp and included by config.hpp. main.cpp (C++ Hello World Example) For example, Boost doesn't support CMake. Building a C/C++ unit test (gtest) Adding compile / link flags. Unsurprisingly, we will look at a very similar setup in this post. FindCheck.cmake uses find_library to locate the library, the library path is successfully found: -- Found CHECK: /usr/lib . The target should be built from the C++ source file main.cpp.. If you leave this choice off, the value of BUILD_SHARED_LIBS will be used to pick between STATIC and SHARED. I have provided the full code for this example on Github. The library, the examples and the tool each has their own CMakeLists.txt defining the target and related code in their subdirectory. The idea is to try and help understand exactly what each part of a CMakeLists.txt file does and why it is needed. The documentation refer to a number of variables used by CMake, but I'm struggling to work out which ones to use when. For example, under Debian: molloyd@beaglebone:~/$ sudo apt-get install cmake. .github external-project internal-project .gitignore LICENSE README.md README.md CMake library example An example CMake project to demonstrate creating and linking to a C++ library. CMake is a cross-platform open-source meta-build system which can build, test and package software. . CMake will (at least on windows) search for those configuration files in CMAKE_PREFIX_PATH/<<package_name>>-<<version>>/<<package_name>>-config.cmake (which can be set through an environment variable). The first project will create and install a library and corresponding CMake configuration and package files. We'll develop the shared library in the C programming language and generate the build environment with the help of CMake. CMake v3.5+ A c++ compiler (defaults to gcc) make Installation on Ubuntu The easiest way to install the above on Ubuntu is as follows $ sudo apt-get install build-essential $ sudo apt-get install cmake Some specific examples may require other tools including: boost $ sudo apt-get install libboost-all-dev protobuf Example. Preinstall target. For building, the .so or .dll file and header files are downloaded to a location inside the build folder (i.e. So for example the boost configuration is in the path CMAKE_PREFIX_PATH/boost-1_50/boost-config.cmake In that configuration you can set variables. : In reality, unless used, global symbols in static libraries may be optimized out by the linker. Features The main advantage of this example is that it is auto-generated . molloyd@beaglebone:~/$ cmake -version. On a Debian or Ubuntu based distribution, you can install all these packages with the following commands: sudo apt-get update sudo apt-get install cmake sudo apt-get install build-essential gdb sudo apt-get install libusb-1.0-0-dev. You do this with linker flag: -l<library name>. 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. Say you have file1.cpp, file2.cpp, main.cpp. cmake version 2.8.9. CMake library example that can be found using find_package (). CPack is a powerful, easy to use, cross-platform software packaging tool distributed with CMake. CMake is a cross-platform open-source tool for defining the build process for native applications independently of compilers and environments. Linking against libraries built by other ROS packages. --target example_exe You'll find the executable in <your-build-dir>/src/ directory or <your-build-dir>/Debug/src if you're using Visual Studio to build the project. First, we add two lines to Versions.cmake: set (BOOST_VERSION "1.53.0") set (BOOST_HASH "SHA256=CED7CE2ED8D7D34815AC9DB1D18D28FCD386FFBB3DE6DA45303E1CF193717038") You only need to change the project name, and add the files that need to be compiled in foo/CMakeLists.txt. Fitting Google Test Into A CMake Typical Project - The Big Picture Firstly, let's look at an example of a typical C++ project. The library, foo, can either be built from source or distributed pre-built. You add them to your project with: ADD_LIBRARY (LibsModule file1.cpp file2.cpp ) Now you added them to a module called LibsModule. Building with foo from source This is the default. CMake Installation Head over to CMake download page and get a binary for your operating system, e.g. An example being /usr/local for UNIX based platforms. It can be used with or without CMake, but it may depend on some software being installed on the system. These are typically hard-coded guesses. The regular CMake way: mkdir build && cd build cmake .. make -j ./cmake-library-example Building with pre-built foo # 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. Building a library with CMake This example shows how to build a library with CMake. FindCheck.cmake uses find_library Hello, I am trying to reuse existing FindCheck.cmake module in my project. To build the project, first test that you have CMake installed, and if not, install it using the package manager that is used by your flavor of Linux. Liquidify 4 years ago First, thank you. For example, a Python, Java, C# or Object Pascal application can use a shared library developed in C. In this article, I'll show you how you can create your own shared library. : For sake of simplicity, in this article I am not covering C++20 modules, link-time optimization, or import libraries. The root CMakeLists.txt defines configuration options and adds the subdirectories. You can also build a specific target if you run cmake --build . This article provides an introduction to CMake through a series of examples to help you, as VC++ developers, to create and maintain CMake projects. It uses the generators concept from CMake to abstract package generation on specific platforms. On Linux, you can also install the packages from the distribution's package manager. This clearly shows how CMAKE_STD_LIBRARY cmstd is built. However, it appears that Ubuntu, for instance, provides only static libcheck.a library in the system package. 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 . The example is taken from SI, a . 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. 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.. Here's a small example of a library that uses Boost in its headers and therefore wishes to have its clients setup those directories as well: 1 2 3 4 5 6 7 8 9 10 set (TARGET_NAME cool_lib) add_library ($ {TARGET_NAME} STATIC cool_feature.cpp cool_feature.hpp) target_include_directories ($ {TARGET_NAME} INTERFACE $ {CMAKE_CURRENT_SOURCE_DIR}) 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) Example, I have a project where I need external libraries. It can be used to support multiple native build environments including make, Apple's xcode and Microsoft Visual Studio. . For example, cool_library in the Makefile in the previous section is generated from the source files boring_source2.cpp and boring_source3.cpp, so we would have something like add_library (cool_library STATIC boring_source1.cpp boring_source2.cpp). Packaging With CPack. What do you need Linking against a library in your package. CMake Examples Introduction. Rather than placing all of the source files in one directory, we can organize our project with one or more subdirectories. Let's start with an example of building CUDA with CMake. More details in the following article. For example, a Windows resource DLL or a managed C++/CLI DLL that exports no unmanaged symbols would need to be a MODULE library. Linking against an external library. by using cmakes "fetchContent" mechanism ]). Building a library. This CMakeLists.txt will build a static library and the two binaries that depend on it. CMake can be hard to figure out. Shared library files usually have .dll (Windows), .so (Linux), or .dylib (macOS) extensions. To compile this code, you must have g++, CMake, and libusb-1.0-dev installed on the machine. Here we go, AnotherLibrary wasn't packed this time. For this program, we have one library (MyLibExample) with a header file and a source file, and one application, MyExample, with one source file. cmake Build Targets Libraries 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. You can check out my blog post, CMake_OpenCV_And_UnitTests, to find an example on how to use target_link_libraries. However, if we build this project on Linux, the library will be named liblibminisat.a, because CMake knows that library files on Linux are prefixed with lib as a convention, and it tries to be helpful. The write_basic_package_version_file () function from above will create SomeLibraryConfigVersion.cmake file in the install folder. The special INTERFACE library lets you declare a header-only library as a proper CMake target, and then use it like any other library. --target <target_name> , for example: cmake --build . # CMake instructions to make the static lib ADD_LIBRARY ( MyStaticLib STATIC Structure.c ) # CMake instructions to test using the static lib SET ( APP_EXE StaticTest ) ADD_EXECUTABLE ( $ {APP_EXE} Main.c ) TARGET_LINK_LIBRARIES ( $ {APP_EXE} MyStaticLib ) And then here is the output from running it: Basically you need to create two library targets for both static and shared build and tweak the config.cmake to for users to choose from them. CMakeLists Examples. Listing 1 shows the CMake file for a CUDA example called "particles". CMAKE_SYSTEM_LIBRARY_PATH CMAKE_SYSTEM_FRAMEWORK_PATH The platform paths that these variables contain are locations that typically include installed software. On Windows double click the binary to install. Second, could you provide a few versions of a working github version of this?. You can make use of them in your CMake project without having to re-write their build scripts. CMake provides a collection of find modules for third-party libraries. For example, say your project defines a library with some common code and an executable that uses the functions inside the library. As at first I ran CMake with default generator, it was using Unix Makefiles (which is the default one on some systems, such as Mac OS).And for a long time I couldn't understand why, even though I . Including external libraries using other build systems. Since I found it hard to find a comprehensive example of how a header-only library can be set up, I decided to provide an example of a CMakeLists.txt file for such a library here and analyze it line by line. If a library does not export any symbols, it must not be declared as a SHARED library. Windows, Linux, or Mac OS X. The idea is that you build modules in CMake, and link them together. Report it as a bug to third-party library authors if a library does not support clients to use CMake. Importing Targets . In this case, we will create a subdirectory specifically for our library. Update: now using modern cmake (version >= 3.9), since commit 46f0b93. Given a C++ source file main.cpp defining a main() function, an accompanying CMakeLists.txt file (with the following content) will instruct CMake to generate the appropriate build instructions for the current system and default C++ compiler. On Linux run the binary from a terminal. Building an executable. Sadly, CPACK_COMPONENTS_ALL (and other useful CPack variables) can be set only on project configuration, not on cpack run. If the library is an open-source project, consider sending a patch. Let's ignore header files for now, as they can be all included in your source files. Instead, CMake provides a find module to use Boost in CMake. Note that you typically do not list header files here. Let's assume we have a CMake project that depends on an non-CMake built dynamically shared library called LibImagePipeline. Search the paths specified by the PATHS option or in the short-hand version of the command. cmake --build . Where the library name is the name of the shared library, minus the first lib part and minus the .so file extension. Modern CMake Examples Overview This repository is a collection of as simple as possible CMake projects (with a focus on installing ). While CMake enjoys increasing interest, there are still plenty of libraries using native build systems like Unix Makefiles. (I'm targeting Windows and Mac) The second project will use the generated package. I only found 3 cases: FindGSL.cmake assumes the DLL is in the same folder as the lib, so it just does a string replace ".lib" ".dll" FindGTest.cmake just sets the IMPORTED_IMPLIB property, and ignores the IMPORTED_LOCATION entirely. I love CMake, but unfortunately, its documentation is more focused on completeness than on providing hands-on-examples. cmake_minimum_required(VERSION 3.8 FATAL_ERROR) project(cmake_and_cuda LANGUAGES CXX CUDA) include(CTest) add_library(particles STATIC randomize.cpp randomize.h Keep that in mind. FindHDF5.cmake These libs cannot be bundled with my project so it must be supplied by the system/user somehow. This is because CMake expects a SHARED library to always have an associated import library on Windows. For example, if boost library is a requirement for your project here is how you would structure your CMakeLists.txt file: cmake_minimum_required (VERSION 3.8)project . build <-- The $ {PROJECT_BINARY_DIR} or build . # Almost all CMake files should start with this # You should always specify a range with the newest # and oldest tested versions of CMake. The file is split into two parts: the first part finds the library and include files on your system, according to some prescribed rule; the second part populates and exports the CMake targets for users to include. This is a simple yet complete example of a proper CMakeLists. This is different from qmake, where header files need to be explicitly listed so that they are processed by the Meta-Object Compiler (moc). $ ./src/example_exe Hello, world! CMake will make sure to first build test before linking it to myapp.
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