#Cmake commands generator#
CMake Generator ExpressionsĪ generator expression is used to query aspects of the build as the build files are generated giving us a dynamic view of the build generation process.Ī static view of the build generation process is provided by command line definitions and variables defined in the configuration files, which are saved to the build cache file CMakeCache.txt in the build target directory. To do this, we make use of CMake generator expressions, so we need a short digression to discuss this feature of CMake. To support multiple build configurations for our training projects we just need to refactor the project and toolchain configuration files to be aware of build types. A source of confusion and criticism when first starting to use CMake. Note: when using Make builds, the –config option is silently ignored, and when using multi-configuration build tools like Visual Studio, the setting for CMAKE_BUILD_TYPE is also silently ignored. įor developer’s working with build tools supporting multiple build configurations (like Xcode and Visual Studio), the build type is not passed on the generate command line (using -CCMAKE_BUILD_TYPE=…) but on the cmake build command with the –config option. There is an example shell script build.sh in the accompanying GitHub project. We also have two separate commands, one for each build type: cmake -build build/debugĪside: as a traditional Unix/Linux developer used to typing make I find these long and complex commands irksome and I know I’m not alone in this as it is a common source of criticism of CMake.Īt this point, using a shell script, or scripts, to encapsulate the underlying cmake commands to simplify build the system would be advisable. B build/release -DCMAKE_BUILD_TYPE=RELEASE \ B build/debug -DCMAKE_BUILD_TYPE=DEBUG \ Unfortunately, this means we have to run two very similar cmake commands to generate different configurations: cmake -S.
Our underlying build system for training is Make, so we need to create separate output folders for each type of build we require. The build type specification is case insensitive, so we prefer to be consistent and use all upper case types despite the fact that the CMake documentation refers to capitalised types. Suggested build types are values such as Debug and Release, but CMake allows any type that is supported by the build tool. When using CMake to generate different build requirements using make files we take this into account by placing different build configurations in different output directories for each type of build we want to support.ĬMake refers to different build configurations as a Build Type. On the other hand, the Unix/Linux/GNU Make system does not support build configurations. Therefore, we need to configure our build process to cater for these different output requirements.īoth Visual Studio and Xcode support multiple build configurations, and CMake can generate appropriate build configuration files for these systems. For example, a developer’s build typically includes metadata used by a debugger which is not required for a released version of the project. Outputs from each type of build configuration are usually different. We usually do this using build configurations.
#Cmake commands software#
To support the different phases and objectives of a Software Development Lifecycle a project will need to differentiate between developing code, testing (in its various forms) and releasing a version for end-use. In the real world, projects are never as simple as this minimal example, and we try to reflect this in our training. B build -DCMAKE_TOOLCHAIN_FILE=toolchain-STM32F407.cmake The CMake commands used to generate and build the project are: cmake -S. We looked at the minimum requirements to configure the CMake build generator for a cross-compilation project using a project definition file ( CMakeLists.txt), a toolchain definition file ( toolchain-STM32F407.cmake).
#Cmake commands how to#
In my previous blog post CMake Part – The Dark Arts I discussed how to configure CMake to cross-compile to target hardware such as our STM32F407 Discovery board.
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