![]() ![]() B buildĪs you can see a list may be declared using the set command. The above results in the following output $ cmake -S. If not, here’s an example of how a list might be declared: set(imaList1 "This is a list") Kind of like every square is a rectangle, but not every rectangle is a square. Because who needs a type system, right? This may also be true the other way around – a string may be a list, but isn’t necessarily one. A concrete definition could be formulated as follows: A CMake list is a semicolon-separated sequence of elements.Īnd since everything in CMake is a string, this means that a list is a semicolon-separated sequence of strings, making itself a string. But let’s move on before we get too philosophical.ĬMake takes a different approach. We could also be all functional and say that a list is a data structure that consists of a head and a tail, where the tail is itself a list, that may be empty. We may want to be more precise about it and consider implementation details like if it’s a node-based or contiguous memory layout. What is a list? In the broadest sense, it’s a sequential collection, or container, of elements. One of them is that virtually everything is a string, including the main subject of this post – lists. I generally like CMake and I think it’s currently the best tool out there for building cross-platform C++ projects, but it does suffer from some of the (what I assume are) legacy design decisions. See ot-efr32 and ot-nrf528xx.So, let me warn you right away – I rant a little in this one. Support for multiple platforms in a single repository is possible and several platform repositories can be used as reference. A good example of this file for a repository which supports only a single platform is from ot-cc2538. This is where you define the source files, include paths, and compiler flags for your platform library. ![]() A good starting point would be to copy the ot-efr32 version of this file and modify it to fit your platform. This is a toolchain file which defines some variables that CMake uses in the build process. It also contains a few other required files. This is the heart of the repository and is where the platform abstraction layer is implemented. If you would like to include sample applications in the repo, create an examples folder and add it to the build tree as well. The third_party folder contains any third-party code. The src folder is where the platform-abstration layer source code is located. Now that the top-level configuration is defined, it's time to add other subdirectories to the build tree. set_property(CACHE EFR32_PLATFORM PROPERTY STRINGS $/crypto The CMakeLists.txt file includes a check that aborts builds launched for unsupported platforms. For the sake of this example, we've defined multiple platforms, but having a single platform for the _PLATFORM_VALUES variable is fine as well. We also define a variable EFR32_PLATFORM_VALUES which is a list of efr32 platforms supported by ot-efr32. In this example, we set the project name to ot-efr32 with a version of 0.0.1. ![]() The very first values to define are the project name and the supported platforms. The CMakeLists.txt at the root of your repository is the top of the build tree and is a good place to start defining the various targets, options, and macros used in the build process. The CMake build system relies on CMakeLists.txt files which define build targets.
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