Cmake Set Variable Command Line
Whatever is in set is the default meaning if not specified on the command line.
Cmake set variable command line. Cmake dvariable value path to source you can set a variable after the initial cmake invocation to change its value. Any options after are not parsed by cmake but they are still included in the set of cmake argv n variables passed to the script including the itself. Now let s look at cached variables. Execute process command echo bar output variable foo in this particular case cmake offers a cross platform solution.
If you want to set a variable from the command line cmake offers a variable cache. If set to 1 will log every self run some command command output in a file called conan run log that file will be located in the current execution directory so if we call self run in the conanfile py s build method the file will be located in the build folder. Command line always overrides even if cache is already set. Set my cache variable value cache string description this will not replace an existing value.
Options are boolean variables with possible values on off. A key ingredient in all cmake builds. Cmake provides builtin command line tools through the signature cmake e command options run cmake e or cmake e help for a summary of commands. Options and variables are defined on the cmake command line like this.
I m also using a script right now for the builds because i have to set the whole toolchain via command line options. If you still have questions please ask a new question peter apr 1 at 15 29. The syntax for declaring a variable and setting it if it is not already set is. When you rerun the cache is read in before starting so that cmake remembers what you ran it with.
Run a command line tool. It is possible for the cache entry to exist prior to the call but have no type set if it was created on the cmake 1 command line by a user through the d var value option without specifying. You can also undefine a variable. Some variables are already here like cmake build type.
In a build cached variables are set in the command line or in a graphical tool such as ccmake cmake gui and then written to a file called cmakecache txt. Variables customize how the build will be generated. Cmake uvariable path to source variables are stored in the cmake cache. Cmake can itself be used to run commands that can be used on all systems one of which is echo.
Options and variables are defined on the cmake command line like this. Furthermore any normal variable binding in the current scope will be removed to expose the newly cached value to any immediately following evaluation. In case we execute self run in our source method the conan run log will be. Cmake dvariable value path to hpx you can set a variable after the initial cmake invocation for changing its value.
To do this cmake should be passed the command line arg e.