It is actually less work if the library isn't header only and has a "proper" CMake setup. target_link_libraries(): to tell CMake that app is dependent on geo library. Step 2: Build the library. The source file for the library is passed as an argument to add_library (). These are typically hard-coded guesses. View Profile View Forum Posts View Articles Beginner Join Date Mar 2020 Posts 7 Qt products Platforms. By default it is empty, it is intended to be set by the project. Before your Merge Request can be accepted . It's a lot easier to distribute 1 executable than it is to distribute an executable with supporting files. It's really hard to say what's going on in those CMake scripts. 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. Where the library name is the name of the shared library, minus the first lib part and minus the .so file extension. There are many times that embedding files into an executable would be useful. We can have CMake install the resulting library and binaries with this snippet install ( TARGETS libminisat minisat minisat-simp LIBRARY DESTINATION /usr/local/lib ARCHIVE DESTINATION /usr/local/lib RUNTIME DESTINATION /usr/local/bin ) An example being /usr/local for UNIX based platforms. add_library(libraryName [STATIC|SHARED|MODULE] [EXCLUDE_FROM_ALL] source1 source2 ..) Firstly, the first parameter to add_library is the name of the library. When writing the headers of the library, I would like includes to look like #include "Header.hpp". CMAKE_LIBRARY_PATH. #include // note that you need to prepend some.h with the folder name, // because that is how it is in the installation folder: // install/include/somelibrary/some.h #include int main(int argc, char *argv []) { std::cout << "base application message" << std::endl; // here we call a function from the library sm::lbr::printsomething (); } OpenABF is deployed as a single - header library, but is developed as a multi- header library. CMake's function for creating a library is add_library, and the code block below shows the usage. An object library compiles source files but does not archive or link their object files into a library. Hello, I have very little experience with CMake and I am trying to set up a simple library. Step 1: Get the sources. target_include_directories(): is for making source files aware of the location of private headers relative to the project directory. Clone the submodule if pre-compiled binary isn't found. Features. cmake_minimum_required (version 3.15) # set the project name and version project (tutorial version 1.0) # specify the c++ standard add_library (tutorial_compiler_flags interface) target_compile_features (tutorial_compiler_flags interface cxx_std_11) # add compiler warning flags just when building this project via # the build_interface genex set Nowadays we luckily found more modern alternative libraries for our use-cases. CMake can be hard to figure out. I am writing a library and client combo with CMake, and I am setting the include paths for the client. Vildnex. TODO 2: Click to show/hide answer Creates an Object Library. Thread Tools. 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. The CMakeLists.txt file is to create two libraries and then create a combined library looks like: project (test) add_library (lib1 STATIC test1.c) add_library (lib2 STATIC test2.c) add_custom_target (combined ALL COMMAND $ {CMAKE_AR} rc libcombined.a $<TARGET_FILE:lib1> $<TARGET_FILE:lib2>) But, I can only include the external library header files either in the source files specified in target_sources or in my library's . So we're essentially saying that "target_name" should look for header files (or any included files) in the directories specified after the scope. Show Printable Version; 25th March 2020, 18:03 #1. The main advantage of this example is that it is auto-generated.You only need to change the project name, and add the files that need to be compiled in foo/CMakeLists.txt. After saving the changes to CMakeLists.txt, request CMake to update the build environment for our shared library: cd ~/mylib/build cmake .. Next, run the following two commands to install the shared library system-wide: CMAKE_INSTALL_INCLUDEDIR: The directory for installing header files to be included by user programs. Author bolu-atx commented on May 1, 2020 This looks like the following line: TODO 1: Click to show/hide answer To make use of the new library we will add an add_subdirectory () call in the top-level CMakeLists.txt file so that the library will get built. You do this with linker flag: -l<library name>. I love CMake, but unfortunately, its documentation is more focused on completeness than on providing hands-on-examples. Qt5 CMake include all libraries into executable I'm trying to build a with Qt 5.14 an application on release mode and everything is working fine inside of Qt . add_library (a interface) add_library (a::a alias a) target_include_directories (a interface "$" "$") target_link_libraries (a interface "$" "$" "$" "$" "$" "$") #### install install (targets a export atargets runtime destination $ {cmake_install_bindir} component a_runtime library destination $ {cmake_install_libdir} component CMAKE_SYSTEM_LIBRARY_PATH CMAKE_SYSTEM_FRAMEWORK_PATH The platform paths that these variables contain are locations that typically include installed 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. When we still had OpenSSL as a dependency we simply created a custom repo with a CMake script that would create an interface target to link to a precompiled library. An object library compiles source files but does not archive or link their object files into a library. Typically /usr/local/include. To create an build target that creates an library, use the add_library command:. My Filesystem: include --Header Files src --Source Files extern --SDL2 build Here is an example of the file causing the error: #include <iostream> #include <SDL.h> //Error using namespace std; /* The code */ Instead other targets created by add_library or add_executable may reference the objects using an expression of the form $ as a source, where objlib is the object library name. Search the paths specified by the PATHS option or in the short-hand version of the command. Exactly like in the header only case. Because the library uses CMake we can just use the add . 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, you can explicitly set to build an shared or an static library by adding STATIC or SHARED after the target name: CMake supports installing build artifacts made as part of a target via the install command. Functions like add_definitions, include_directories, link_libraries, and others are still around in modern CMake due to backward compatibility. The example is taken from SI, a . The library depends on other external libraries and adds them using the add_subdirectory and target_link_library commands. Before you begin, install VisualGDB 5.3 or later. Updating the single - header file . How does an object library in CMake compile? . See also CMAKE_SYSTEM_LIBRARY_PATH and CMAKE_PREFIX_PATH. Start Visual Studio and open the VisualGDB Linux Project Wizard: Select "Create a new project -> Application -> Use CMake" and check the "Use the advanced CMake Project System" checkbox: We will change the project type to a shared library once the project is created. 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. Everything compiles, builds, and runs fine. SHARED means a shared library, you can also make a static library with STATIC keyword, or an object file with OBJECT keyword. For example: So it leads me to think that the cause of the error is that the include directories aren't exported with the static library. CMake library example that can be found using find_package().. Update: now using modern cmake (version >= 3.9), since commit 46f0b93. cmake-example-library. Thread: Qt5 CMake include all libraries into executable. include (GNUInstallDirs) Here is the directory structure for the project. Unsurprisingly, this CMake command adds include directories to CMake target, and the syntax is the following: target_include_directories(target_name {PUBLIC |PRIVATE |INTERFACE } directories.) The default locations are provided by the CMake module GNUInstallDirs which the first thing to include. All code changes should be made to the multi- header files in include /OpenABF/. Example. Case 2: A library that must be build by CMake. For example you could embed some simple image files into the executable . Jonathan's Blog - Embedding Arbitrary Data in Executable with CMake Sometimes you need to include some binary data into an executable. However, whenever possible, you should prefer using their counterparts target_compile_definitions, target_include_directories, target_sources, or target_link_libraries instead. so the top level cmakelists is able to find the header file located in include, but that header file contains the line: #include which references a file in a gen directory inside the build directory created by the library's cmakelists.txt ( https://github.com/siposcsaba89/socketcan-cpp/blob/master/cmakelists.txt ) target_link_libraries(foo INTERFACE bar::bar) This adds bar::bar to foo's INTERFACE.This is not used for foo itself, but is for anything using foo.You probably want PUBLIC (though PRIVATE works if foo does not publicly use bar::bar's headers). For example: Semicolon-separated list of directories specifying a search path for the find_library() command. But when writing the client I want includes to look like #include <Library/Header.hpp>. The OpenABF CMake project provides a number of flags for configuring the installation: . Click here to expand the full FindLibrary.cmake Finding the package files Let's assume that dependencies are either put into the build-dir in a folder prebuilt or installed in the GNU default directories.
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