And since try compile must produce a valid executable, you may need - if you are e.g. This is meant to "inject custom code into project builds without modifying their source" directly after your project() command was processed (and the build environment was detected).Ī toolchain file is read multiple time while determining the system, compiler, etc. Then you can call cmake with something like > cmake -D CMAKE_USER_MAKE_RULES_OVERRIDE:PATH=.\MakeRulesOverwrite.cmake. MakeRulesOverwrite.cmake list(APPEND CMAKE_CXX_SOURCE_FILE_EXTENSIONS c) This allows to modify non-cached default values after the automatic detection by CMake.Įxample: Extending the valid CXX source file extensions by. 12 contributors Feedback In this article Supported CMake and CMakePresets.json versions Enable CMakePresets. limitations what is already known (it runs before everything else, so mostly you can check against CMAKE_GENERATOR)ĬMAKE_USER_MAKE_RULES_OVERRIDE, CMAKE_USER_MAKE_RULES_OVERRIDE_.own variable scope (everything non-cached here is not visible in your main CMakeLists.txt).Note: It supports all CMake script commands like if() calls, but PreLoad.cmake has its It has just to be in the same directory as your project's CMakeLists.txt. More or less the same as the "initial cache" option (see above), but it's not given through a command line option. Mainly used for cross-compiling, but it can more generally describes as preset values per compiler toolchain used. Like some library search paths on your computer or some presets used in your company.Ĭmake-gui lets you manually modify your project's options (editing all non-internal variables in CMakeCache.txt) before you finally generate the build environment. option) trough several projects over and over again. This can be used if you want to give some preset values (you would normally give via -D. There are several ways you could change a CMake default values without actually having to touch your project's CMakeLists.txt files. Project Configuration Files: Modify the Defaults The results of those steps are stored in cached variables and those files are special in such case the they are safeguarded by variables like CMAKE_CXX_COMPILER_LOADED, CMAKE_CXX_INFORMATION_LOADED or CMAKE_CXX_COMPILER_WORKS to not run with each consecutive CMake configuration step again. determine compiler features by actually calling the compiler in a simple generated CMake projects. Share/cmake-x.y/Modules/CMakeTestCXXCompiler.cmake However, you probably shouldnt be using a config file to determine which compiler flags CMake needs, they really belong inside your CMakeLists. ├┬ share/cmake-3.2/Modules/CMakeDetermineSystem.cmake Since youre invoking BuildSetup.cmake using cmake -C, the contents of BuildSetup.cmake are parsed before anything in your main CMakeLists.txt. │ CMakeLists.txt(5): project(ParserTest CXX ) │ CMakeLists.txt(3): include(BeforeProjectCmd.cmake ) ┌ CMakeLists.txt(1): cmake_minimum_required(VERSION 2.8 ) cmake -debug-output -trace -G"Visual Studio 12 2013" -DCMAKE_TOOLCHAIN_FILE:FILE_PATH=Toolchain.txt I got a long trace that I tried to summarize: # Begin try to read Variable_watch(CMAKE_BACKWARDS_COMPATIBILITY) To find an answer, I have tried the following: I have setup a simple main CMakeLists.txt as shown below and run cmake -trace … to analyze the parsing order. Variable watch can be called from a scope outside your main CMakeLists.txt file has been parsed: Execute command or macro in CMake as the last step before the 'configure' step finishes.printing messages from the toolchain file show multiple times: CMake toolchain includes multiple files The toolchain file is parsed multiple times, therefore e.g.The toolchain file is parsed before the compiler is identified, so you have to populate certain CMake variables in the cache first/in the toolchain file: CMake cross-compile with specific linker doesn't pass arguments to armlink.The cases I came across so far, where the above information was important: Is the file order depending on the CMake version or some CMake options/settings/environment incl.Is there a documentation available that describes the order in whichįiles (incl.But I came across several cases where it was important when or in which order CMake is parsing certain files. I have a list of vars definedinside a cmake which is called using from main CMakeLists.txt: add_custom_target(gen_aĬOMMAND $ has no value when I am printing it in seems as a trivial question, since CMake is a script language the general answer is: strictly sequential.
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