[CMake] What does debug-output do?

[Daniel]

Daniel wrote:
> I have tried using the --debug-output command line option but it doesn't 
> seem to change anything.  Can someone elaborate on this?  I'm not trying 
> to debug anything in particular just curious.
> -- 
> Daniel

I found this in the man page now that I'm no longer in Windows:
"Print extra stuff during the cmake run like stack traces with 
message(send_error ) calls."

So let me rephrase my question, Is this the only command that outputs extra 
info?  What would be great is a message command that outputs only when this flag 
is set but doesn't cause the build to fail, that way you don't need to remove 
any trace messages once things are working.
--
Daniel