Cmake Set Variable Example

Signatures of this command that specify a value. The include command executes another cmake script in the same scope as the calling script. The only way to set a compiler and flags to do cross compilation reliably with cmake is with a toolchain file as done in the tutorial you have found.

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User Interaction Guide Cmake 3 18 2 Documentation

It uses the variable cmake module path as a search path.

Cmake set variable example. Graphviz test graph dotty test graph see also generating dependency graphs with cmake and cmake graphviz output cleaner. For msvc projects the variables are those that are set in a developer command prompt for a specific platform. When we faced the same issue you have a toolkit which produces a script so set the compile environment we changed the toolkit in a way that it produces a toolchain file along with the script. Placeholder expect zero or more arguments.

A lot of variables used by cmake are set with the project and enable language calls. Set a normal cache or environment variable to a given value. So it could get important to set some variables before those commands are used. Example set my variable the value is a string by default a local variable is only defined in the current directory and any subdirectories added through the add subdirectory command.

Set var true set var main cpp set var1 var2 but cmake does also know global cached variables persisted in cmakecache txt and if normal and cached variables of the same name exist in the current scope normal variables do hide the cached ones. Environment variables may differ from where cmake generated the make environment and when the the make files are put to use. If and only if no normal variable exists then it falls back to the cache variable foo. It s a lot like the include directive in c c.

Target help and there is the graphical output solution example found here. Set my cache variable value cache string description this will not replace an existing value. For makefile generator build environments you could use cmake exe build. To extend the scope of a variable there are two possibilities.

An environment encapsulates the environment variables that are set in the process that visual studio uses to invoke cmake exe. Multiple arguments will be joined as a semicolon separated list to form the actual variable value to be set. Cmake variables are defined at file scope. Mostly you will use normal variables.

It s typically used to define a common set of functions or macros in the calling script. Some variables are already here like cmake build type. For example the msvc x64 x64 environment is the same as running the developer command prompt for vs 2017 or. The syntax for declaring a variable and setting it if it is not already set is.

If you want to set a variable from the command line cmake offers a variable cache. When foo is evaluated cmake first looks for a normal variable foo in scope and uses it if set. See the cmake language 7 variables documentation for the scopes and interaction of normal variables and cache entries. The code set foo x sets the normal variable foo.