Cmake Set Variable Command Line

Now let s look at cached variables.

Cmake set variable command line.

For the full list of such commands run cmake e help. 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. Variables customize how the build will be generated. Cmake dvariable value path to source you can set a variable after the initial cmake invocation to change its value.

Set my cache variable value cache string description this will not replace an existing value. Cmake uvariable path to source variables are stored in the cmake cache. Some variables are already here like cmake build type. 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. Whatever is in set is the default meaning if not specified on the command line. To do this cmake should be passed the command line arg e. Thanks for the advice however i ve already tried setting the compiler via environment variable and got the same result as setting it via cmake option dcmake c.

I also threw my build directory away between each test. Options are boolean variables with possible values on off. You can also undefine a variable. When you rerun the cache is read in before starting so that cmake remembers what you ran it with.

The syntax for declaring a variable and setting it if it is not already set is. 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. If you still have questions please ask a new question peter apr 1 at 15 29.

Cmake dvariable value path to hpx you can set a variable after the initial cmake invocation for changing its value. A key ingredient in all cmake builds. Options and variables are defined on the cmake command line like this. Execute process command echo bar output variable foo in this particular case cmake offers a cross platform solution.

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. 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. 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. Run a command line tool.

Cmake can itself be used to run commands that can be used on all systems one of which is echo.