[U-Boot] Low priority request for info about alternative to #ifdef

[James Chargin]

Hi

I've seen periodic discussion on the U-Boot mailing list of alternatives 
to #ifdef. I need a bit more information about one specific alternative, 
but in my searches of the source for 2017.03, I can't find examples that 
might help me. Also, my memory of this is a dim so I'm not sure I'm 
looking for the right thing.

Is there something that is similar to "#ifdef CONFIG_*" but looks more 
like "if_defined(CONFIG_*)" and relies on compile/link time elimination 
of unused code?

Thanks for your time.

Jim
-- 
Jim Chargin
AJA Video Systems                       jimc at aja.com
(530) 271-3334                          http://www.aja.com