[CMake] How to build a target on install (only)?

[Paul Smith]

On Mon, 2015-02-16 at 09:55 -0500, David Cole wrote:
> Ah ha! Back to the simpler approach with install(CODE....!
> 
> Good idea, Nils.
> 
> Then you just need a stamp/sentinel file associated with running the
> operation, and you can check it against your input.

Aha, that works well.  I don't need a sentinel file since I can just
test against one of the files that dsymutil generates.

And, I discovered I can have a multi-line CODE just by adding newlines
into the string, so that works well.

Nice!  Thanks all!