Cmake sub library

Cmake sub library. Usual build configurations are Debug, Release, RelWithDebInfo and MinSizeRel. As a final step, it’s recommended to create and install a so called pkg-config file. cmake) provide specialized search logic. - Do you mean that when executable is running (at runtime), a loader cannot find the library? (This is opposite to the situation, when an executable is failed to build because linker cannot find the library). May 13, 2020 · Unknown CMake command "SWIG_ADD_LIBRARY" Loading Installing Files. cpp, main. Jul 7, 2016 · Case 2: A library that must be build by CMake. The prefix for static libraries that you link to. Yes. Advanced Usage: Find Modules: Custom modules (e. I have a C++ project that consists of a main program ( main. Unfortunately it is not working. CMake is an excellent cross-platform build tool for automatically generating Unix Makefiles, Windows NMake Makefiles, Microsoft Visual Studio® Solution projects or Apple Xcode® projects for MacOS. Therefore, CMake does not allow other targets to link to modules. There you can add any source files you want to that target. Tips, Software. Nov 21, 2017 · I have written a library that I used to compile using a self-written Makefile, but now I want to switch to cmake. Not the recommended approach in general though. Those target names are independent of whatever you named the dependency in the FetchContent_Declare () call. cpp helper/innerpkg/a. g. PUBLIC. This gives me granularity, but you can also just use add_custom_target or add_custom_command to do whatever is needed. Use install (FILES) instead. Feb 19, 2017 · 1. CMake has many predefined modules that can be found in the Modules subdirectory of CMake. txt file, as instructed in Structuring projects. txt instead of one for every sub-directory, all 90% identical. txt by adding: add_library(mylib SHARED ${SourceDir}) install (TARGETS mylib DESTINATION lib) Now I can see the file libmylib. I'm trying to add a feature as a sub-library to an existing application Feb 17, 2021 · Stack Overflow Public questions & answers; Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Talent Build your employer brand To give a more current answer, since newer projects use newer CMake versions (probably with libraries which use old CMake versions). This is basically what you've tried, but now it is possible. May 4, 2015 · 3. cpp. To build an example, go to its directory in a terminal and run. In the current CMake the order between add_subdirectory call, which creates target sfml-system, and target_link_libraries call, which links with that target, does NOT matter: Even if you reorder these calls, CMake still correctly determines, that sfml-system is a target, not a plain file. If liba is library developed by you and you are using CMake to build it, then you should install libaConfig. 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. h. You add them to your project with: ADD_LIBRARY(LibsModule. txt file at the top level, each subdirectory having its own file that lists its own source files and targets. Treatment of $<CONFIG> builds. cpp helper/helper. Similarly, dependencies on other libraries in your project Feb 11, 2021 · This is a bit of an odd question, but I’m trying to write “elegant” CMake code instead of hacky. txt project file to specify dependencies. We want to create an executable that when run creates a basic main. txt file of the external lib will have some add_library(ext_lib_name ) statements in it. The tree looks like this (I removed all the irrelevant files): . CMake with git submodules example. add_library(A STATIC [ source files for A ]) # or SHARED instead of STATIC target_include_directories(A PUBLIC . I am aware that one cannot link static libraries to other static This command is used to find a library. Exactly like in the header only case. When option WITH_SOABI is also specified, the module suffix will include the Python_SOSABI value, if any. Signaling Join all the <input> arguments together using the <glue> string and store the result in the named <output_variable>. Unfortunately 1. Those variables all start If minor component is specified, the version should be, at least, 3. Navigate to Help/guide/importing-exporting/MyExe, create a build directory, run cmake and build and install the project. c. I would suggest putting three add_subdirectory calls in your root CMakeLists. As an example, if your project's sources are in src, and you need headers from include, you could do it like this: src/main. 24. After adding the sources, the headers you have in your "include/" directory can be added to the target using the target_include_directories function. 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. txt to obtain information about how liba have been built. cmake file with liba itself, which would contain necessary definitions. cpp src/bar. The top level CMakeLists. cpp) target_link_libraries(generate_mesh OpenMeshCore) The names are not absolute; you'll see contention about test/ vs. cpp) # Find and link library. Where the library name is the name of the shared library, minus the first lib part and minus the . If only basename_LIBRARY_RELEASE is defined, basename_LIBRARY will be set to the release value, and basename_LIBRARY_DEBUG will be set to basename_LIBRARY_DEBUG-NOTFOUND The idea is that you build modules in CMake, and link them together. Options common to multiple signatures are covered here but they are valid only for signatures that specify May 10, 2019 · Assume that we have the following directory structure. from an `add_subdirectory()` call. Mar 9, 2022 · Interested in using a shared library in your C or C++ application? Not sure how to build your application with the GCC compiler, such that it properly links the shared library? This article explains how to link a shared library to your application, built with the GCC toolchain. src/b. By default CPack will run the install rule for the current project. you'd have to ensure add_subdirectory(abc) was called before the add_subdirectory for the one where this will be used. For example, we used to do: find_package(FOO REQUIRED) target_link_libraries(mylib foo) or the like. CMAKE_STATIC_LIBRARY_PREFIX. Second, you list the headers in your add_executable() or add_library() call. The CMakeLists. DEFINITION ${LIBNAME}_publicheaders) However, there are a couple of provisos: This has to be called after setting the variable in the subdir. 7) # The 'sub' libraries, e. By using AFTER or BEFORE explicitly, you can select between appending and prepending, independent of the default. Some of them define installation options for files and targets. Aug 1, 2010 · To link an executable with a library that resides in a standard location, one can do the following in a CmakeLists. Dec 16, 2016 · CMake doesn't allow to install IMPORTED libraries as TARGETS. Make sure to run vcpkg integrate install in your project directory to integrate vcpkg with your CMake project before building and installing This variable is used to initialize the LIBRARY_OUTPUT_DIRECTORY property on all the targets. Writing, compiling, and using shared libraries in a cross-platform manner with a modern build system is one of the most common problems in development. from the build directory. NO_CMAKE_FIND_ROOT_PATH] ) This command is used to find a library. I just give the dependencies at the source level with include_directories(), at the link level with target_link_libraries() and at the CMake level with Nov 2, 2011 · Whether or not there's a name clash depends on the full set of directories being used in the sum of all add_subdirectory calls. Here's a refresher of what that looks like from the command line: mkdir Step3_buildcd Step3_buildcmake . The modules can find many common software packages. Say you have file1. |-- libA. You just need to add: In each CMakeLists. The prefix to use for the name of a static library, lib on UNIX. Best Practices: Clarity: Use meaningful variable names and comments. qt_add_executable() tells CMake that we want to build an executable (so not a library) called helloworld as a target. IMPORTED_IMPLIB "full_path_to_lib_file") Build and Run ¶. This command is invoked by a project in the CMake provides a number of ways to incorporate such things into the build. Jun 30, 2017 · I would add one more abstraction level to your project structure: lib - libraries for the application. txt which has multiple add_library entries Mar 21, 2022 · CMake: include a directory into parent from within a subdirectory (aka library) 7 how do i build libraries in subdirectories using cmake? In a CMake-driven build environment, these settings can all be pre-defined with configuration scripts ('toolchain files') which configure CMake with a full set of environment variables, binary/library paths, and compiler flags for each of the available invoking MSYS sub-systems (often known as "MSYSTEM"'s), appropriately setting each of the Feb 8, 2024 · In each library subdirectory, define a target using the add_library command. Specify whether the library is statically or dynamically linked. I only got this working by setting both configurations in one line, as suggested by @sakra in a related question - and doing so for every library that needed to be linked: Dec 12, 2011 · CMake will likely generate separate lib1, lib2 and lib3 directories in there. If the library is found the result is stored in the variable and the search will not be repeated unless the variable is cleared. /Step3cmake --build . Feb 23, 2022 · Create and install the shared library’s pkg-config file with CMake. find_library(MYCUSTOMLIB mycustomlib PATH_SUFFIXES mycustomlib) target_link_libraries(myprogram PUBLIC ${MYCUSTOMLIB}) # Find library's headers and add it as a search path. Old library location variable. These would typically be found after a package has been installed to the system. txt file: create_executable(generate_mesh generate_mesh. But now the sub-library now In most CMake projects, using the CMake install rules will be sufficient to create the desired package. One drawback with computing the set of source files is that CMake will not automatically detect when new files are added to your source tree. Mar 30, 2022 · Compile examples. Library targets are otherwise placed in this directory. Cloning: you must clone with the --recurse-submodules option. There are at least 2 reasons for such behavior: Сitation of one of CMake developer from bug report. 2 which is the version where the Stable Application Binary Interface was introduced. Because the library uses CMake we can just use the add Jan 16, 2014 · In terms of CMake, you only need one CMakeLists. If it is created within the project an ordering dependency will automatically be added in the build system to make sure the named library target is up-to-date before the <target> links. . so file extension. $ mkdir build. cmake. There are multiple signatures for this command. target_include_directories (MathFunctions INTERFACE $ {CMAKE_CURRENT_SOURCE Specifies include directories to use when compiling a given target. May 3, 2018 · Make CMake variable set in subproject (variable nesting) available to all other subprojects Load 7 more related questions Show fewer related questions 0 First, you use include_directories() to tell CMake to add the directory as -I to the compilation command line. That way cmake will build the external lib as a subfolder ("subproject"). This will be useful below. I created a shared library in CMakeLists. Software is typically installed into a directory separate from the source and build trees. To join a list's elements, prefer to use the JOIN operator from the list() command. txt organization, the choice is yours: You can build a single CMakeLists. txt file ( add_backward(MainExecutableA-Z) ). I tried to do its on separate environment, because of that I've created docker in Jan 27, 2021 · Easily Create Shared Libraries with CMake (Part 1) When working on a cross-platform C++ or C project, it is easy to get confused by platform differences and scattered information. Apr 16, 2018 · Directory Layout. “find modules”: CMake scripts that can be hand-written by anyone that CMake executes to see if a package can be located. Something like the following: In the subdir CMakeLists. hpp ), and a subdirectory ( algorithms/) full of classes that implement the abstract class. However, if you have a more complicated project, you can specify sub-projects and install directories with the variable CPACK_INSTALL_CMAKE_PROJECTS. Projects and users have the flexibility to choose between methods that best suit their needs. Each Find<XX>. Every user and application can now potentially use the library. Jun 10, 2017 · Just don't set the CMAKE_*_OUTPUT_DIRECTORY variables as cached, because if another CMake project uses yours as a sub-project you would under certain circumstances overwrite your parent project's settings (cached variables are global). This variable defines how to link a library or framework for the specified <FEATURE> when a LINK_LIBRARY generator expression is used and the link language for the target is <LANG> . , FindOpenSSL. This way, you can avoid mentioning the lib/inc directory in Nov 13, 2017 · My problem is that the executable can't find the shared library. Your library can be used in this way: find_package(MyProject) add_library(bar []) target_link_libraries(bar MyProject::MyTarget) Dec 31, 2022 · Saved searches Use saved searches to filter your results more quickly Mar 9, 2022 · 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. cd build. Options include: Dec 13, 2022 · The name you give to FetchContent_Declare () is the name of the dependency. If none of these options are specified, it indicates that the library could be built as either shared or static. May 9, 2017 · Doing this, however, does not work, and the project ends up not linking (the symbols from the backward-cpp library are not found), unless I link the output executables to the third party library directly, in the root CMakeLists. Aug 28, 2022 · Then, you have add_subdirectory(A) with a CMakeLists. cmake module defines a set of variables that will allow a project to use the software package once it is found. Jul 25, 2023 · I'm trying to install boost-program-options (not header-only) on Linux with VCPKG. Clone the submodule if pre-compiled binary isn’t found. This ensures that the external library is compiled and linked correctly with your project. This method is less common, but can have advantages over the other two in some circumstances. ├── include │ ├── Mar 12, 2017 · One CMakeLists. Cross-Compilation: Handle architectures different from the build machine. cpp source2. add_library(sublib_a STATIC source1. It is actually less work if the library isn’t header only and has a “proper” CMake setup. Jan 25, 2017 · cmake_minimum_required(VERSION 3. At this point we built the shared library and installed it system-wide, with the help of CMake. Specifying only major version 3 is equivalent to 3. The main program uses one library, and each library uses the other one May 14, 2017 · 2. mkdir build. txt file brings in the subdirectory files with include(). As of CMake 3. If the SYSTEM option is given, the compiler will be told the directories are meant as system include directories on some platforms. /) Note that by using target_include_directories, you tell CMake to include the directories for the libraries automatically later on. Sep 6, 2022 · I followed the tutorial steps where it shows linking to a subdirectory/library named “MathFunctions”. --target SomeLibrary Scanning dependencies of target SomeLibrary [ 50%] Building CXX object libraries/SomeLibrary New in version 3. The named <target> must have been created by a command such as add_executable() or add_library() and must not be an ALIAS target. Apr 12, 2011 · Adding a subdirectory does not do much more than specify to CMake that it should enter the directory and look for another CMakeLists. The primary methods of bringing dependencies into the build are the find_package() command and the FetchContent module. c) add_custom_target(combined ALL COMMAND ${CMAKE_AR} rc libcombined. The contents for the b and c libraries are as follows: include/b/b. If it is not set, then CMake defaults to Aug 3, 2022 · In Linux it is really easy, I just install the library with make install and then add it to my project with find_package (mynewlib REQUIRED). That way I can make a include directory next to it that holds all my header files The CONFIGURE_DEPENDS flags tells CMake to re-run the glob command at build time. Previous topic Somehow the answer from @Mike Willekes got CMake linking in the same target both release and debug for me :(. If the external lib builds with cmake then you could add the lib to your build via a add_subdirectory ($ {libname_SOURCE_DIR}) call. cc file in the current directory. FetchContent allows you to pass these configuration options to the external project during the integration Aug 22, 2012 · find_library(CURL_LIBRARY NAMES curl curllib libcurl_imp curllib_static HINTS "${CMAKE_PREFIX_PATH}/curl/lib" ) For Boost I would strongly recommend using the FindBoost standard module and setting the BOOST_DIR variable to point to your Boost libraries. 11) you can apply the lib/inc include directory directly to your BASIC library target using target_include_directories. where a is your super project that contains other subprojects. You need your sources because generally you build something (a library or an executable) that requires linking to some library that already exist. I've configured CMake to build the subdirectory as an object library: # algorithms/CMakeLists. cpp) add_library(sublib_b STATIC source3. Jan 20, 2012 · Since CMake 3. Jul 20, 2015 · The library dependencies in the above example do look like this: App1 -> LibA -> LibC -> LibB. txt in that subdirectory has: # state that anybody linking to us needs to include the current source dir # to find MathFunctions. For a statically linked internal library, add the CMake: target_link_libraries command to the CMakeLists. The details of this project are not important. Use the qt_add_library command to create a library and link against it in the CMakeLists. – Aug 31, 2020 · External lib builds with cmake. tests/, and the application folder may be called something else (or not exist for a library-only project). I just feel it would be easier to manage one top-level CMakeLists. txt in your your hierarchy. add_library(algorithms_lib OBJECT. The named target must be created by add_library() within the project or as an IMPORTED library. Jul 29, 2016 · How to use CMake to add Third Party Libraries to your Project — Selective Intellect. txt file at the top, which will just build one program and list every cpp file in every sub-directory, like this: add_executable(main main. IMPORTED_LOCATION "full_path_to_dll_file") set_property(TARGET mylib PROPERTY. LIBRARY_OUTPUT_PATH ¶. Make a new directory called Step3_build, run the cmake executable or the cmake-gui to configure the project and then build it with your chosen build tool or by using cmake--build. We want to keep things tidy, so we will have a top-level src directory with the source files. 2. Jul 20, 2022 · I have this dependency graph: my_project |—> static linking perceptualdiff |—> (static linking with dynamic loading) FreeImage (built as a shared library) I can correctly build perceptualdiff on its own. txt. You need to link to the target names, not to the dependency name. 21 (with CMakePresets. $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>. The FindPkgConfig module is also sometimes used, although May 8, 2013 · get_directory_property(MyVar. This allows it to be distributed in a clean form and isolates users from the details of the build process. See that target property for additional information. Feb 14, 2018 · The users of the library will have to link the target, and the definition will be added only if the library is found on the system when the user library is configured. /* && cmake -DCMAKE_BUILD_TYPE=Debug . In addition, (if you can upgrade your CMake to at least 2. CMAKE_STATIC_LIBRARY_PREFIX_<LANG> overrides this for language <LANG>. cpp ) 3. a $<TARGET_FILE:lib1> $<TARGET_FILE:lib2>) The options to the ar command are platform-dependent in this case, although the CMAKE_AR variable is platform-independent. This macro takes a library base name as an argument, and will choose good values for the variables. App1 -> LibB. CMake provides the install command to specify how a project is to be installed. The target properties ARCHIVE_OUTPUT_DIRECTORY , LIBRARY_OUTPUT_DIRECTORY, and RUNTIME_OUTPUT_DIRECTORY supersede this variable for a target if they are set. CMake searches well-known locations for each dependency, and the provided software project(test) add_library(lib1 STATIC test1. Then I use it as any other external library, target_link_libraries, add the headers and everything goes fine. Step 1: Get the sources. file1. Use the PUBLIC scoping argument here to propagate these include directories to consuming CMake targets. h, while we don't. json) with one preset that uses system packages and one that uses the vcpkg toolchain (if installed) to make development easy to get in (specifically for Windows). The issue is that I work on a project that brings in libraries with find_package() and some of the dependency libraries have been getting “better” at CMake. ¶. It is a wrapper around the built-in add_executable() command, and provides additional logic to automatically handle things like linking of Qt plugins in static Qt builds, platform-specific customization of library names, and so on. SHARED can be done by using the BUILD_SHARED_LIBS flag (check the add_library documentation) With respect to the CMakeLists. LIBRARY_OUTPUT_PATH. libstuff first, then client and server. With target_sources you can do this: ONLY_CMAKE_FIND_ROOT_PATH |. You manually have to re-create your build files then. This will ensure that the necessary sub-dependencies are copied to your install directory when using install () and CPack. You'll also sometime see a python folder for python bindings, or a cmake folder for helper CMake files, like Find<library>. cpp source4. andarius (Julien) August 28, 2022, 8:54am CMake files provided with a software package contain instructions for finding each build dependency. Imported targets were originally designed for importing from an existing installation of some external package so installing did not make sense at the time. $<INSTALL_INTERFACE:include>. txt there. 2. depending on what has been found and set. txt files. Jul 1, 2016 · add_executable(myprogram src/foo. For less CMake-friendly, I usually just write my own CMake List file for them, copying whatever configuration they do. Some build dependencies are optional in that the build may succeed with a different feature set if the dependency is missing, and some dependencies are required. string (TOLOWER <string> <output_variable>) ¶. Step 2: Build the library. # Provide the name of one header file you know should. Let's ignore header files for now, as they can be all included in your source files. Setup the Stuff project as if it is standalone, but add variables to the cmake cache such that it can be "imported" by other projects. 8. And on the contents of the CMakeLists. For single configuration generators like make and Ninja run: cmake -DCMAKE_BUILD Feb 19, 2015 · designate the path within the command. You still need to create a library with the source files with add_library and link it to your executable with target_link_libraries. In that case, CMake uses the setting of the variable BUILD_SHARED_LIBS to determine if the library should be SHARED or STATIC. cmake files. Then you include libaConfig in dummy's CMakeLists. DIRECTORY ${CMAKE_SOURCE_DIR}/abc. This allows for the elements to have special characters like ; in them. See the cmake-modules(7) manual for a detailed list. find_library (NAMES gtest PATHS path1 path2 pathN) set the variable CMAKE_LIBRARY_PATH. This variable should Apr 6, 2022 · I was setting up a project with CMake 3. 22: The environment variable CMAKE_INSTALL_MODE can override the default copying behavior of install(). $ cd Help/guide/importing-exporting/MyExe. txt that may look like this (assuming you have a main in this dir A): add_executable(foo ${CMAKE_CURRENT_SOURCE_DIR}/main. cpp, file2. . txt Jul 29, 2013 · Yes, I suppose there's no real reason why I shouldn't still build a library for each subdirectory, although I don't anticipate a large number of sources. The top-level CMakeLists. Short answer: tell CMake that there is dependency between its targets. Configuring external dependencies: Many CMake-based projects require certain configuration options to be set when building external dependencies. Apr 25, 2022 · As far as your CMake target goes, though, the brute-force hardcoded version would look something like this: add_library(mylib SHARED IMPORTED) set_property(TARGET mylib PROPERTY. If nothing is found, the result will be <VAR>-NOTFOUND. txt will only know that there is two different thing, the app sub-project and the lib sub-project. c) target_link_libraries(foo PRIVATE targetB) Then second line create the relation between the target foo and the target targetB and, when compiling, the path to your test For those CMake-friendly projects, it's just a add_subdirectory(external/mydep). This default behavior can be changed by setting CMAKE_INCLUDE_DIRECTORIES_BEFORE to ON. cpp) # The main library that contains all of the sub libraries. CMake in itself doesn't compile your project, it only calls your toolchain and passes parameters to it, and your toolchain doesn't 'know' that it is being called by CMake, or the structure of your project. You need to look inside the dependency to see what CMake targets it defines. The code just parses some CSV files and creates entries. In Windows, I cannot make install, so I add it as a git submodule and use it like this: Mar 2, 2021 · CMake: include a directory into parent from within a subdirectory (aka library) 5 Using target_include_directories with object libraries add_library(libsomething STATIC) target_link_libraries(libsomething PUBLIC glog::glog) Note, all CMake magic works as expected: you need not specify glog's include directory or build artifacts for libsomething. But the basics are there. SelectLibraryConfigurations. 1 there is a new way to add source from subdirectories: target_sources Say you have root_dir and root_dir/sub_dir and source files in both. &hellip; Mar 8, 2021 · 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 . target_link_libraries(my_program PRIVATE SOMELIB SOMELIBmain) CMake will evaluate SOMELIBs locations for you and link my_program against SOMELIB and SOMELIBmain [1]. May 28, 2023 · Replace <path_to_vcpkg> with the actual path to your vcpkg installation directory. A cache entry named by <VAR> is created to store the result of this command. c) add_library(lib2 STATIC test2. You do this with linker flag: -l<library name>. add_library(mainlib SHARED) target_link_libraries(mainlib sublib_a sublib_b) COMPONENTS: Targets specific sub-libraries within larger packages. i. shared-libraries. At the moment I prefer the local dependencies variant, because it's easier to use. Switching between STATIC vs. In this project I demonstrate the usage of Eigen Library which is a Linear Algebra module for C++. Changed in version 3. $ cmake --build . cpp ), a header that defines an abstract class ( algorithm. Works for both Debug and Release configurations and also for Linux. e. Mar 21, 2022 · 2. An example directory structure could look like follows: |-- CMakeLists. so in the correct folder after installing, but I am not sure how can I import this into another separate project's CMakeLists. Aug 25, 2022 · You can make reactnativezstd depend on the right target and CMake will compute what to pass to the linker to make it find the library. Examples are on GitHub here and their links are mentioned in each section as well. Mar 13, 2018 · Previous message (by thread): [CMake] [cmake-developers] Hi all, I'm a newbie of CMake. For this variable to have any effect, the associated CMAKE_<LANG>_LINK_LIBRARY_USING_<FEATURE>_SUPPORTED variable must be set to true. Jun 10, 2022 · “config files”: package files that can be generated by CMake that describe how to load an installation of your project. 13 there is an option to simply set a variable in the parent project, which sets the variable in all sub projects. za oz lw my ue cu tp cb zj av