[CMake] Passing values back from SUBDIRS

[John Biddiscombe]

Brad,

>> hmmm. There must be an easy way of doing this.
>
> This is not possible because subdirectory code always executes AFTER 
> parent directory code.  The SUBDIRS command is NOT processed inline.  It

I had hoped there was a way around it.

> We are attempting to solve this problem for the next version of CMake to 
> make subdirectories more inuitive.

Good news. I noticed another post with a similar subject. The way CMake 
handles them now is very strange and I've never quite understood why.

As it happens, I have found a way of achieving what I want. using the file 
write/append feature, but it's not a general solution as I need to "know" in 
advance which subdir is first. If I know this (which I do since it's used by 
all the others), then I can initialize the file in there and it eventually 
works.

Thanks. (Are there any docs about outlining upcoming changes?)

JB