[CMake] How the heck does one set options?

[Dan Kegel]

On Wed, Nov 2, 2011 at 6:36 PM, Dan Kegel <dank at kegel.com> wrote:
> So, now what?  How does one set an option declared by a subdirectory
> before entering that subdirectory?  Lots of people use gtest, surely
> someone has run into this before.

I'm starting to suspect that everyone who needs this to work
unattended edits the gtest source to change the default there.