![]() ![]() 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. Configuring Debug and Release BuildsĬMake refers to different build configurations as a Build Type. 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. 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. 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). It would also be more consistent with the other functionality.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. Would it be possible to change the behavior here with a new cmake policy? IE, check to see if the RHS of the BOOL:VARIABLE is an existing variable, and dereference it, like the other logical functions? I can’t imagine it would break existing code, as the only time people would be using it this way, would be if they were making a mistake, just as I was. Fortunately the fix was a good sed command across a bunch of files to add the $ characters, but in large projects, I’m sure it would go unnoticed. ![]() It was a mistake that was hard to find, and only after carefully reading the docs did I track it down. BUILD_ZLIB is interpreted as a literal string, which evaluates to TRUE. However, the generator expression expects a STRING variable here. In the ExternalProject_Add function, I have CMAKE_ARGS lines similar toĪ casual user might expect that the same boolean variable is dereferenced here as well, especially since there’s a giant “BOOL” setting right there beside it. If() would automatically dereference BUILD_ZLIB to see if it were true or false. In all of the logic handling functions, I would use this variable as if(BUILD_ZLIB) Using the ExternalPackage_Add function, I’m building a few third party dependencies, based on boolean variables that I set in earlier scripts, BUILD_ZLIB, and so on. I recently came across a bug in one of my projects build system, and I feel that its a result of an inconsistent design philosophy between the generator expressions, and the other logical functions.
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