Kitware also provides online and onsite CMake trainings. Simple "Hello World" Project 1 1 1 silver badge. Follow edited May 23, 2017 at 11:46. It can do much more than that too (e.g., build MS Visual Studio solutions), but in this discussion I focus on the auto-generation of Makefiles for C/C++ projects. 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 It has a dependency on the list of package files, so that CMake knows it needs to rebuild the zip archive when those files change. Object library is a very useful feature which is introduced in cmake 2.8.8. If the target you're building is a library, CMake will build a static one by default. W orking with build systems is not the easiest task in the Software Engineering's world, this is especially true for C++ developers where there's not a "standard" of to use this or that. Aside from just going to the library folder and running CMake from there, you can actually do it from the project root - by setting --target option on build: $ rm -r ./* && cmake -DCMAKE_BUILD_TYPE=Debug .. $ cmake --build . Where the library name is the name of the shared library, minus the first lib part and minus the .so file extension. Windows, Linux, or Mac OS X. Sometimes you can forget something, if it wasn't used long time (or never on practice). To compile this code, you must have g++, CMake, and libusb-1.0-dev installed on the machine. Florian Florian. Yes it is. 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. ; src/main.cc is our main executable and src/math. CMake Tutorial Introduction A Basic Starting Point (Step 1) Adding a Version Number and Configured Header File Specify the C++ Standard Build and Test Adding a Library (Step 2) Adding Usage Requirements for Library (Step 3) Installing and Testing (Step 4) Install Rules Testing Support Adding System Introspection (Step 5) 1. But since foo is a static object, even though it could guess it needs to be PIC 1, it does not enable PIC by default for foo. cmake_minimum_required (VERSION 3.1) . Firstly, the first parameter to add_library is the name of the library. This works faster as referencing the library project's directory using the add_subdirectory() command, as the exporting mechanism allows precisely selecting which targets to export. The source code of the sample project used below is available on GitHub. Why. CMake Installation Head over to CMake download page and get a binary for your operating system, e.g. This can be any valid CMake name, and the filename for the compiled library will be that value in your build directory. > mkdir build > cd build > cmake .. > cmake --build . And then in your CMake script code you have: set (CMAKE_CXX_VISIBILITY_PRESET hidden) set (CMAKE_VISIBILITY_INLINES_HIDDEN 1) This will ensure that your shared library will contain only the MY_LIB_API symbols. CMake will ensure the generated build files will take multiple library dependencies into account. This tutorial shows how to export a CMake library to a package and import it from a different project using the find_package() command. API: C++ 11 or newer, CMake 3.5+ Compiler: GCC, Clang or MSVC Building a static library and executable which uses CUDA and C++ with CMake and the Makefile generator. CMake/Tutorials/Object Library; Share. Let's mention a bit of CMake syntax. CMake Options Not all of our training course exercises use the RTOS features, so we decided to control inclusion of the middleware using a CMake option. A subsequent build is likely to overwrite object files produced by the earlier configuration. # 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: The CMake documentation is quite comprehensive but not suitable for a beginner. For single-config generators switching the configuration requires re-running CMake. ; test: Directory for test. cmake-shared-lib-tutorial. the Main library depends on libA which in turn depends on libB (both built as OBJECT libraries). add_library (<name> OBJECT [<source>.]) The command name cmake_minimum_required is case insensitive, so the common practice is to use lower case. On Windows double click the binary to install. What follows is a brief overview of the commands available in CMake for dependency management, pretending that our project depends on SDL (a cross-platform development library). cmake says it is mandatory and it will define convenient variables PROJECT_NAME, PROJECT_VERSION and PROJECT_DESCRIPTION (this latter variable necessitate cmake 3.9): project (mylib VERSION 1.0.1 DESCRIPTION "mylib description") Declare a new library target. Basic CMake project. 1: the find_library () command The idea here is to instruct CMake to search the system for the required library and then link it to the executable if found. In this case, we will create a subdirectory specifically for our library. It doesn't require any external tools, works on all platforms and is relatively easy to setup and flexible for the user. CMake is a cross-platform software for building projects written in C, C++, Fortran, CUDA and so on. Now you can set INTERFACE properties on this only (since there is no built component). For internal use, we can just link against these libraries. Simple project to demonstrate how to create shared (dynamic) library using C++ & CMake. It is a little more complicated today. On Linux run the binary from a terminal. The second situation is if you have a pre-built library that you want to use. command is an abstraction for the necessary build/make call. Now, since this is a tutorial, we are going to explicitly require that SqrtLibrary is built statically. This always needs to include the root CMakeLists.txt and the include and source files of the library. You do this with linker flag: -l<library name>. This feature allows us group a bunch of object files and pass them as src to add_library or add_executable. So, in MathFunctions/CMakeLists.txt we need to create a SqrtLibrary that will conditionally be built and installed when USE_MYMATH is enabled. A CMake script should avoid setting the CMAKE_BUILD_TYPE itself, as it's generally considered the users responsibility to do so. Introduction to the basics Minimum Version. full CMake playlist: https://www.youtube.com/watch?v=nlKcXPUJGwA&list=PLalVdRk2RC6o5GHu618ARWh0VO0bFlif4repo: https://github.com/codetechandtutorials/OurLord. Rather than placing all of the source files in one directory, we can organize our project with one or more subdirectories. This command creates a new library target built from sources. Command Line (Out-of-Source, recommended) To keep your source code clean from any build artifacts you should do "out-of-source" builds. --target SomeLibrary Scanning dependencies of target SomeLibrary [ 50%] Building CXX object libraries/SomeLibrary . We'll also cover the installation of the resulting shared library on the end-user's Linux system. Code looks somewhat like this: /basic/libA/CMakeLists.txt add_library(A OBJECT) target_include_directories(A include/) target_sources(A PRIVATE src/a.cpp) /basic/libB/CMakeLists.txt add_library(B OBJECT) target_include_directories(B include/) Since bar (shared) is linked against foo (static), both of bar and foo must be compiled with position independent code. So I wrote this short CMake introduction as a distilled version of what I found out after working through the docs and . An object library compiles source files but does not archive or link their object files into a library. When trying to learn CMake I could not find any good introduction. We define a custom command to create the zip file: it needs to invoke cmake -E tar to create an archive. This also serves as a basic project template for a modern CMake library build. Here's the first line of every CMakeLists.txt, which is the required name of the file CMake looks for:. These are called interface libraries in CMake and you would write: add_library(some_header_only_lib INTERFACE) Notice you didn't need to add any source files. Figure 1 shows the output. 1.cmake configuration 2. The install rules are fairly straight forward. The code in this library is implemented using many of our internal libraries. This tutorial explains a relatively simple solution using CMake - the de-facto standard build tool - and git - the de-facto source code version control system. In this video we build a basic library with CMake.Here is a link to the source code.https://github.com/YansonTech/Introduction-to-libraries-with-CMake CMake utilizes build-systems such as Ninja, Linux make, Visual Studio, and Xcode. CMake automatically found and verified the C++ and CUDA compilers and generated a makefile project. On Linux, you can also install the packages from the distribution's package manager. My previous post about CMake provided a simple CMakeLists.txt for a small, self-contained, project. You should declare a project. The cmake --build . 37.5k 8 8 gold badges 124 124 silver badges 147 147 bronze badges. Benefits: Avoids unnecessary static library creation No need for linking hack for circular static library dependency Build / compile [Extension] compile dynamic library (1) Modify cmakelists txt (2) Configure and build [Extension] compile object library (1) Modify cmakelists txt (2) Build and compile (3) Modify library name Last Introductory article There is only one file. The main thing it's missing is handling dependencies. When we run nmake, it looks for makefile in the current directory. Building complex projects is where CMake really shines CMake is a cross-platform Makefile generator! CMake Tutorial A Basic Starting Point (Step 1) Adding a Version Number and Configured Header File Specify the C++ Standard Build and Test Adding a Library (Step 2) Adding Usage Requirements for Library (Step 3) Installing and Testing (Step 4) Install Rules Testing Support Adding System Introspection (Step 5) Specify Compile Definition 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. An example of how to apply some of the so called "Modern CMake" to build a simple project composed by an executable that uses a library. For all the compile options we can use cl and for all the linker options we can use link. However, we only want to ship a single library. This nmake section assumes that we have Visual C++ 2008.. STATIC libraries are archives of object files that are linked directly into other targets. You can subscribe or request information by contacting us. To configure the CMake project and generate a makefile, I used the command cmake -DCMAKE_CUDA_FLAGS="-arch=sm_30" . If you are using the Sysprogs CMake fork with this patch, it can shorten the long file paths even further to the . To build a shared library, set BUILD_SHARED_LIBS=ON like this: cmake -DBUILD_SHARED_LIBS=ON <source-dir> Some generators (Visual Studio and XCode) support building multiple configurations of your projects in one build directory. This is partly for convenience, and partly . This is provided from CMake to the source code through the TutorialConfig.h.in configured file by adding the following line to it: #cmakedefine USE_MYMATH Installing and Testing (Step 3) For the next step we will add install rules and testing support to our project. 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