![]() This method of saving the state between between runs of the CMake command comes from the CMake-git-version-tracking repository. We can write the git commit hash using the file(WRITE) command and then we can file(STRINGS) command to read the content of the file back into CMake. I would like the build configuration in CMakeLists.txt to be such that it builds in Release mode by default, and builds in Debug mode only when expli. Variable CMake set variable CONANCMAKETOOLCHAINFILE: CMAKETOOLCHAINFILE: CONANCMAKESYSTEMNAME: CMAKESYSTEMNAME: CONANCMAKESYSTEMVERSION. Since we don’t have access to the CMake cache when running in CMake’s script mode, we have to save this information into an external file called git-state.txt. I have a C++ project that is built using CMake. For general information on variables, see the Variables section in the cmake-language manual. If ENV var is found in the PATHS section the environment variable var will be read and converted from a system environment variable to a cmake style list of. We only want to regenerate the git_version.cpp if the git hash has actually changed. cmake-variables - CMake Variables Reference This page documents variables that are provided by CMake or have meaning to CMake when set by project code. If both the command line option and the variable are. The only thing left is that we want to reduce the amount of work done. To make a log level persist between CMake runs, set CMAKEMESSAGELOGLEVEL as a cache variable instead. Changing some of the variables may result in more variables being created. This will effectively display current CMake settings, which can then be changed with -D option. We almost have all of the pieces together. List cache variables will run CMake and list all the variables from the CMake cache that are not marked as INTERNAL or ADVANCED. ![]() This allows the byproducts to be used in other parts of the CMake script otherwise there would be an error indicating that the file is missing, but in reality the file has just not been generated yet, which isn’t a problem. We also have to specify the BYPRODUCTS of the command. These must be passed along since a CMake script file does not have access to the cache so we must pass these values along. The -Dpre_configure_file and -Dpost_configure_file include the directories that the configuration files are from and the generated data should go. the -DRUN_CHECK_GIT_VERSION=1 tells the script that we should run the CheckGitVersion function. We must also pass any variables we want the script to have access through the -D arguments. The -P indicates that we should run cmake in a script mode which means that it will run the cmake file, not modify the cache at all. # Get the latest abbreviated commit hash of the working branchĬOMMAND git log -1 -format=%h WORKING_DIRECTORY $ indicates that we should run the cmake executable for this command.
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