Starting with CMake 3.4, more and more find modules export targets that can be used via target_link_libraries. Modules Use modern find modules that declare exported targets. Don’t abuse usage requirements.Īs an example, don’t add -Wall to the PUBLIC or INTERFACE section of target_compile_options, since it is not required to build depending targets. So it’s much better to tell CMake the compile features so that it can figure out the appropriate compiler option to use. Setting the C++ standard via -std=c++14 in CMAKE_CXX_FLAGS will brake in the future, because those requirements are also fulfilled in other standards like C++17 and the compiler option is not the same on old compilers. Get your hands off CMAKE_CXX_FLAGS.ĭifferent compilers use different command-line parameter formats. This increases the chance of hidden dependencies. All targets defined on that level inherit those properties. Those commands operate on the directory level. Forget the commands add_compile_options, include_directories, link_directories, link_libraries. Defining such project properties globally makes it easier to manage the project with all its targets. Defining such properties globally in the top-level CMakeLists.txt file prevents scenarios where public headers of a dependent target causing a depending target not to compile because the depending target uses stricter compiler options. Define project properties globally.įor example, a project might use a common set of compiler warnings. Use the same principles for CMakeLists.txt and modules as for the rest of the codebase.
#CMAKE INSTALL DEPENDENCIES CODE#
Treat CMake code like production code.ĬMake is code. Modern CMake is only available starting with version 3.0.0. General Use at least CMake version 3.0.0. If you are interested in the history and internal architecture of CMake, have a look at the article CMake in the book The Architecture of Open Source Applications. This text is heavily influenced by Mathieu Ropert’s and Daniel Pfeifer’s talks. The next video that goes more into the details of modern CMake is Daniel Pfeifer’s C++Now 2017 talk Effective CMake ( slides).
#CMAKE INSTALL DEPENDENCIES SOFTWARE#
The modular design ideas in this talk are based on the book Large-Scale C++ Software Design by John Lakos. It provides a thorough explanation of what modern CMake is and why it is so much better than “old school” CMake. Go read it now.Īfter that, watch Mathieu Ropert’s CppCon 2017 talk Using Modern CMake Patterns to Enforce a Good Modular Design ( slides).
LLVM’s CMake Primer provides a good high-level introduction to the CMake syntax. For a brief user-level introduction to CMake, watch C++ Weekly, Episode 78, Intro to CMake by Jason Turner.
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