![]() ![]() Thus, our rapidjson.cmake will only download the library from GitHub and then set RAPIDJSON_INCLUDE_DIR that contains the path to the header files. CMake is a cross-platform software for building projects written in C, C++, Fortran, CUDA and so on. But then when I went to code of famous header only library like spdlog they have src folder. So after compiling the code we won't have a separate library files, and which makes it platform independent. Now the cool thing is that RapidJSON is a “header-only” library, meaning that we can simply copy and include the headers from rapidjson/include and we can then use everything. On internet the header only is defined something like the definitions of the functions, macros is defined in headers itself. (self): this is not building a library, just tests cmake CMake (self) cmake. The default one already adds an include subfolder to the include path. ![]() We now want to use CMake’s ExternalProject_Add to automatically download and add RapidJSON. There is no need for build() method, as header-only are not built There is no need for a custom packageinfo() method. By default CMake’s model is that a build directory only contains a single configuration, be it Debug, Release, MinSizeRel, or RelWithDebInfo. Project Layoutįirst of all, we assume a typical CMake project layout: My_ProjectĬMake can manage external sources as external projects During Installing and Testing (Step 4) of the tutorial we added the ability for CMake to install the library and headers of the project. How to make a header-only library with cmake Like this: addlibrary(project INTERFACE) targetincludedirectories(project INTERFACE. Only a few files use an ifdef HAVECONFIGH to protect against inclusion in case the define is not set this is used in files that may get compiled outside the main build system. These files must exist for the compilation to pass. ![]() 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. A few header files are generated using CMake configurefile() and included in the desired source files. is a GNU-like compiler linking with the GNU runtime libraries clang. So this post will firstly serve as a reminder for me and secondly make you hopefully struggle less than me. I love CMake, but unfortunately, its documentation is more focused on completeness than on providing hands-on-examples. Hello, Currently I have a projet that use CMake to generate Visual Studio 2019. Last time I used it, I wanted to include it with CMake. nocopysource True will disable the copy of the source folder to the build directory as there is no need to do so because source code is not modified at all. Therefore, when a header-only library is installed, only header files are copied at the destination. This type of library is not compiled standalone. Project(glm VERSION $/cmake_uninstall.RapidJSON is a cool and fast C++ library from Tencent for parsing JSON files. A header-only library has all the implementations defined in headers. By setting this property to ON, you can disable compilation of the given source file, even if it should be compiled because it is part of the library's/executable's sources. This is set automatically based on the file extension and is used by CMake to determine if certain dependency information should be computed. This is done by calling addlibrary without sources and the INTERFACE keyword, for example addlibrary(myheaderonlylib INTERFACE). A property on a source file that indicates if the source file is a header file with no associated implementation. Blob: e5159b0fd9e779fd4209a58cdddbf3c169518e25 Ĭmake_minimum_required(VERSION 3.2 FATAL_ERROR) In the case of a header only library, you need to tell CMake that no compilation is required by creating an interface library. ![]()
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