cmake, lost in the concept of global variables (and PARENT_SCOPE or add_subdirectory alternatives)

Question

I have a cmake project in which I have some modules and I\'m using Find-*.cmake for including the shared modules in the application. For not taking in account every module t

Answer 1

You can 'simulate' GLOBAL variable behavior, by using properties with GLOBAL scope :

SET_PROPERTY(GLOBAL PROPERTY MyGlobalProperty "MyGlobalPropertyValue")

Then you can extract your global property by using

GET_PROPERTY(MyLocalVariable GLOBAL PROPERTY MyGlobalProperty)

Then, MyLocalVariable contains "MyGlobalPropertyValue".

Because PARENT_SCOPE extends variable definitions to the only parent directory (and not to its parents), there are cases it's not enough, for example if you have a deep source tree...