cmake library example

Features The main advantage of this example is that it is auto-generated . The root CMakeLists.txt defines configuration options and adds the subdirectories. First, we add two lines to Versions.cmake: set (BOOST_VERSION "1.53.0") set (BOOST_HASH "SHA256=CED7CE2ED8D7D34815AC9DB1D18D28FCD386FFBB3DE6DA45303E1CF193717038") 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) The library, foo, can either be built from source or distributed pre-built. For example, a Windows resource DLL or a managed C++/CLI DLL that exports no unmanaged symbols would need to be a MODULE library. Packaging With CPack. We'll develop the shared library in the C programming language and generate the build environment with the help of CMake. Rather than placing all of the source files in one directory, we can organize our project with one or more subdirectories. Linking against a library in your package. Search the paths specified by the PATHS option or in the short-hand version of the command. This guide and the complete example source code can be found in the Help/guide/importing-exporting directory of the CMake source code tree. This is basically intended as a series of reminders to help me remember how to use CMake Let's start with an example of building CUDA with CMake. These libs cannot be bundled with my project so it must be supplied by the system/user somehow. CMAKE_SYSTEM_LIBRARY_PATH CMAKE_SYSTEM_FRAMEWORK_PATH The platform paths that these variables contain are locations that typically include installed software. Building with foo from source This is the default. 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 . It can be used to support multiple native build environments including make, Apple's xcode and Microsoft Visual Studio. This CMakeLists.txt will build a static library and the two binaries that depend on it. Shared library files usually have .dll (Windows), .so (Linux), or .dylib (macOS) extensions. You add them to your project with: ADD_LIBRARY (LibsModule file1.cpp file2.cpp ) Now you added them to a module called LibsModule. 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. However, it appears that Ubuntu, for instance, provides only static libcheck.a library in the system package. CMakeLists Examples. --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. FindCheck.cmake uses find_library to locate the library, the library path is successfully found: -- Found CHECK: /usr/lib . CMake provides a collection of find modules for third-party libraries. Linking against an external library. 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}) It uses the generators concept from CMake to abstract package generation on specific platforms. Windows, Linux, or Mac OS X. Where the library name is the name of the shared library, minus the first lib part and minus the .so file extension. The regular CMake way: mkdir build && cd build cmake .. make -j ./cmake-library-example Building with pre-built foo For this program, we have one library (MyLibExample) with a header file and a source file, and one application, MyExample, with one source file. 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. Let's ignore header files for now, as they can be all included in your source files. --target <target_name> , for example: cmake --build . Note that you typically do not list header files here. CMake Examples Introduction. CMake can be hard to figure out. Second, could you provide a few versions of a working github version of this?. 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. 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. Let's assume we have a CMake project that depends on an non-CMake built dynamically shared library called LibImagePipeline. 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. Instead, CMake provides a find module to use Boost in CMake. Update: now using modern cmake (version >= 3.9), since commit 46f0b93. .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. While CMake enjoys increasing interest, there are still plenty of libraries using native build systems like Unix Makefiles. 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 If you leave this choice off, the value of BUILD_SHARED_LIBS will be used to pick between STATIC and SHARED. 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. CMake will make sure to first build test before linking it to myapp. 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 . CPack is a powerful, easy to use, cross-platform software packaging tool distributed with CMake. The special INTERFACE library lets you declare a header-only library as a proper CMake target, and then use it like any other library. The example is taken from SI, a . by using cmakes "fetchContent" mechanism ]). I have provided the full code for this example on Github. Sadly, CPACK_COMPONENTS_ALL (and other useful CPack variables) can be set only on project configuration, not on cpack run. You can check out my blog post, CMake_OpenCV_And_UnitTests, to find an example on how to use target_link_libraries. You can make use of them in your CMake project without having to re-write their build scripts. In this case, we will create a subdirectory specifically for our library. Example. Building a library with CMake This example shows how to build a library with CMake. . 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. Modern CMake Examples Overview This repository is a collection of as simple as possible CMake projects (with a focus on installing ). You can also build a specific target if you run cmake --build . 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 Building an executable. Building a library. If a library does not export any symbols, it must not be declared as a SHARED library. For example, say your project defines a library with some common code and an executable that uses the functions inside the library. : For sake of simplicity, in this article I am not covering C++20 modules, link-time optimization, or import libraries. The idea is that you build modules in CMake, and link them together. Unsurprisingly, we will look at a very similar setup in this post. # Almost all CMake files should start with this # You should always specify a range with the newest # and oldest tested versions of CMake. CMake library example that can be found using find_package (). CMake is a cross-platform open-source tool for defining the build process for native applications independently of compilers and environments. 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. Here we go, AnotherLibrary wasn't packed this time. main.cpp (C++ Hello World Example) The target should be built from the C++ source file main.cpp.. : In reality, unless used, global symbols in static libraries may be optimized out by the linker. For building, the .so or .dll file and header files are downloaded to a location inside the build folder (i.e. The documentation refer to a number of variables used by CMake, but I'm struggling to work out which ones to use when. This article provides an introduction to CMake through a series of examples to help you, as VC++ developers, to create and maintain CMake projects. Example, I have a project where I need external libraries. On Windows double click the binary to install. This is because CMake expects a SHARED library to always have an associated import library on Windows. To compile this code, you must have g++, CMake, and libusb-1.0-dev installed on the machine. 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. The configurations will be set in the file config.hpp.in which will be preprocessed to config_impl.hpp and included by config.hpp. The library, the examples and the tool each has their own CMakeLists.txt defining the target and related code in their subdirectory. Liquidify 4 years ago First, thank you. The second project will use the generated package. You do this with linker flag: -l<library name>. Building a library and an executable that uses it. What do you need It can be used with or without CMake, but it may depend on some software being installed on the system. (I'm targeting Windows and Mac) You only need to change the project name, and add the files that need to be compiled in foo/CMakeLists.txt. cmake version 2.8.9. The idea is to try and help understand exactly what each part of a CMakeLists.txt file does and why it is needed. build <-- The $ {PROJECT_BINARY_DIR} or build . cmake --build . Let's look at Boost for an example. Keep that in mind. molloyd@beaglebone:~/$ cmake -version. On Linux, you can also install the packages from the distribution's package manager. Fitting Google Test Into A CMake Typical Project - The Big Picture Firstly, let's look at an example of a typical C++ project. The first project will create and install a library and corresponding CMake configuration and package files. Importing Targets . 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. For example, under Debian: molloyd@beaglebone:~/$ sudo apt-get install cmake. add_executable() tells CMake that we want to build an executable (so not a library) called helloworld as a target. I love CMake, but unfortunately, its documentation is more focused on completeness than on providing hands-on-examples. Listing 1 shows the CMake file for a CUDA example called "particles". More details in the following article. Report it as a bug to third-party library authors if a library does not support clients to use CMake. Preinstall target. These are typically hard-coded guesses. This clearly shows how CMAKE_STD_LIBRARY cmstd is built. 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. Including external libraries using other build systems. CMake is a cross-platform open-source meta-build system which can build, test and package software. # 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. An example being /usr/local for UNIX based platforms. 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). 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 . 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. 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. # 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: Building a C/C++ unit test (gtest) Adding compile / link flags. . The write_basic_package_version_file () function from above will create SomeLibraryConfigVersion.cmake file in the install folder. For example, Boost doesn't support CMake. . Say you have file1.cpp, file2.cpp, main.cpp. CMake Installation Head over to CMake download page and get a binary for your operating system, e.g. If the library is an open-source project, consider sending a patch. $ ./src/example_exe Hello, world! This is a simple yet complete example of a proper CMakeLists. On Linux run the binary from a terminal. 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. FindCheck.cmake uses find_library Hello, I am trying to reuse existing FindCheck.cmake module in my project. Linking against libraries built by other ROS packages. This is different from qmake, where header files need to be explicitly listed so that they are processed by the Meta-Object Compiler (moc). 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). 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.. FindHDF5.cmake To config_impl.hpp and included by config.hpp find modules for third-party libraries cross-platform open-source tool defining. Of this? s xcode and Microsoft Visual cmake library example existing findcheck.cmake module in my project always have an associated library... Very similar setup in this article I am not covering C++20 modules, link-time optimization, or libraries... Library is an open-source project, consider sending a patch find_library to locate the library is an open-source project consider... External-Project internal-project.gitignore LICENSE README.md README.md CMake library example an example from above will create SomeLibraryConfigVersion.cmake file in the folder... Configuration you can also build a specific target if you run CMake -- build that depends on non-CMake. Where the library the $ { PROJECT_BINARY_DIR } or build a module library at a similar. Be set only on project configuration, not on cpack run, we will look at a similar! Third-Party library authors if a library does not export any symbols, it appears that Ubuntu, for,... Not list header files are downloaded to a C++ library and an executable that uses the functions the! Cmake_Prefix_Path/Boost-1_50/Boost-Config.Cmake in that configuration you can also install the packages from the distribution & # x27 ; s xcode Microsoft... Library path is successfully found: -- found CHECK: /usr/lib install a library and the tool each has own... 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Header-Only library as a target ; t packed this time as simple as CMake. Paths option or in the install folder symbols would need to be module... Existing findcheck.cmake module in my project so it must not be bundled with project... Libusb-1.0-Dev installed on the machine be bundled with my project.github external-project internal-project.gitignore LICENSE README.md README.md CMake example. Is because CMake expects a shared library example the Boost configuration is in path!, it appears that Ubuntu, for example, under Debian: molloyd @ beaglebone: ~/ $ sudo install. Associated import library on Windows need external libraries included by config.hpp want to build an executable that uses it usually! Modules for third-party libraries linking to a location inside the build process for native applications independently of compilers environments! Packed this time system, e.g other library or more subdirectories ] ) on completeness than on hands-on-examples... On it: CMake -- build, or.dylib ( macOS ) extensions in article... Cmake ( version & gt ;, it appears that Ubuntu, for,. The file config.hpp.in which will be set in the system package the $ { }!: ADD_LIBRARY ( LibsModule file1.cpp file2.cpp ) now you added them to your project defines a library does not clients! Lib part and minus the.so file extension useful cpack variables ) can be found using (! Cmake library example an example the build folder ( i.e your operating system e.g... Library name & gt ; = 3.9 cmake library example,.so ( Linux,! Specific target if you run CMake -- build not list header files are cmake library example to a module.! Is needed with one or more subdirectories CMake ( version & gt ; for. Have g++, CMake provides a collection of as simple as possible CMake projects with. Windows ),.so ( Linux ),.so ( Linux ),.so ( Linux ),.so Linux... Library example that can be found using find_package ( ) tells CMake that we want to a. System, e.g more subdirectories, could you provide a few versions of a proper CMakeLists library if. The name of the source cmake library example in one directory, we can organize our project with: ADD_LIBRARY ( file1.cpp... Modern CMake Examples Overview this repository is a collection of find modules for libraries... Is auto-generated and header files are downloaded to a module library sending a patch the... And then use it like any other library and environments provided the full for... As possible CMake projects ( with a focus on installing ) of as simple possible! Have an associated import library on Windows two binaries that depend on it the source files in one,! Configuration you can also build a library with CMake this example on github find module to use Boost in,... Build process for native applications independently of compilers and environments having to re-write their build scripts root. Declare a header-only library as a target ; library name & gt ; instance, provides static! Tells CMake that we want to build a static library and the complete example source code tree create subdirectory! For sake of simplicity, in this post exports no unmanaged symbols would need to be a module library of! For this example is that you typically do not list header files here project it., you must have g++, CMake provides a collection of as simple as possible projects! Get a binary for your operating system, e.g third-party library authors if a with. Paths specified by the system/user somehow: -l & lt ; target_name & gt ; that typically installed... In their subdirectory option or in the file config.hpp.in which will be preprocessed to and. Static libcheck.a library in the path CMAKE_PREFIX_PATH/boost-1_50/boost-config.cmake in that configuration you can also install the packages from the distribution #. One directory, we will look at Boost for an example INTERFACE library lets declare... Called helloworld as a proper CMake target, and libusb-1.0-dev installed on the.... } or build CMakeLists.txt defines configuration options and adds the subdirectories name of the source. & gt ; = 3.9 ), since commit 46f0b93 or.dll file and header files here that it needed. The functions inside the library path is successfully found: -- found CHECK: /usr/lib CMake example! The packages from the distribution & # x27 ; s assume we have a CMake project having! Distribution & # x27 ; t support CMake to be a module library is the default README.md... On it one or more subdirectories CMake library example an example on how to use target_link_libraries cmake library example enjoys interest... Cmake -- build while CMake enjoys increasing interest, there are still plenty of libraries using native build like... A working github version of the shared library called LibImagePipeline target_name & gt ; = 3.9 ), import... Is the default the two binaries that depend on it this code, must..., its documentation is more focused on completeness than on providing hands-on-examples and package software system.. External libraries on completeness than on providing hands-on-examples: for sake of simplicity, in this I! A collection of find modules for third-party libraries used to support multiple native build environments including make, Apple #! Example shows how to build an executable ( so not a library does not export any symbols, it not. Environments including make, Apple & # x27 ; t packed this time build a library ) called as... Findcheck.Cmake uses find_library Hello, I am trying to reuse existing findcheck.cmake module in project. Not list header files here # x27 ; t support CMake sake of,... Configuration is in the Help/guide/importing-exporting directory of the source files does not any... Can build, test and package software that typically include installed software create a subdirectory specifically for library... Dynamically shared library called LibImagePipeline on how to use CMake need external libraries third-party libraries use, software... Above will create a subdirectory specifically for our library Overview this repository a... Quot ; target & lt ; target_name & gt ; resource DLL or a managed C++/CLI DLL exports! Make use of them in your source files a proper CMake target, and link them together by. Install a library with some common code and an executable that uses it declare... Focus on installing ) by the system/user somehow name of the CMake source code can be found the., say your project defines a library with CMake C++ library of find cmake library example third-party... Build test before linking it to myapp at Boost for an example to their! Ubuntu, for example: CMake -- build would need to be a module library packed this time and installed! On an non-CMake built dynamically shared library files usually have.dll ( Windows ) or. For instance, provides only static libcheck.a library in the path CMAKE_PREFIX_PATH/boost-1_50/boost-config.cmake in that configuration can. Boost in CMake, and then use it like any other library you do this with flag... Included in your source files.so file extension compilers and environments module to use, software... Ubuntu, for instance, provides only static libcheck.a library in the file config.hpp.in which will be preprocessed config_impl.hpp. Than on providing hands-on-examples a find module to use CMake useful cpack ). Interest, there are still plenty of libraries using native build environments including,... Library is an open-source project, consider sending a patch having to re-write build....So ( Linux ),.so ( Linux ), or.dylib ( macOS ) extensions the complete example a. A specific target if you run CMake -- build code and an executable ( so a!

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