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
To extend the scope of a variable there are two possibilities:
CACHE it, which will make it globally available
PARENT_SCOPE, which will make it available in the parent scope. The parent scope is either the
CMakeLists.txt file in the parent directory or caller of the current function.
Technically the parent directory will be the
CMakeLists.txt file that included the current file via the