[cmake-developers] Review request: set_emptyvar_PARENT_SCOPE

[Daniele E. Domenichelli]

Hello,

Following this thread:

http://thread.gmane.org/gmane.comp.programming.tools.cmake.devel/8546

I've pushed a patch to the set_emptyvar_PARENT_SCOPE topic.
This patch introduces a new policy (CMP0040) to control the behaviour of

    set(var "" PARENT_SCOPE)

the OLD behaviour is to unset the "var" variable in the parent scope
the NEW behaviour is to set it as an empty string (coherently with set(var ""))


Could you review the topic please?

Thanks.


Cheers,
 Daniele