[CMake] How to pass values up to parent CMakeLists.txt

[James Bigler]

On Mar 31, 2009, at 8:46 PM, Philip Lowman <philip at yhbt.com> wrote:

> On Tue, Mar 31, 2009 at 6:13 PM, James Bigler  
> <jamesbigler at gmail.com> wrote:
> I just recently discovered another way to do this.  I was troubled  
> that pushing it up to the parent scope only pushes it up one level,  
> so if you want to push a variable up to the top, you must push it at  
> each level in the tree.  My discovery was that using the environment  
> variable mechanism is a great alternative to a global variable. ;)
>
> Clever.  There is also CACHE INTERNAL which is a safer way of doing  
> what you're trying to do you might consider trying out.  With CACHE  
> INTERNAL you can't accidentally trounce environment variables that  
> may affect execution of your CMake scripts.  It is slightly more  
> verbose, however.
>
> set(foo bar CACHE INTERNAL "")
>
> -- 
> Philip Lowman

That was one of the first things I tried, but there were some issues  
with it that I don't quite recall at the moment. Of course that  
experiment was a year and a half ago back in the 2.4 days.

James
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