Subject: Re: More config changes, for ro source tree and disjoint build trees
To: Mike Long <mike.long@analog.com>
From: matthew green <mrg@eterna.com.au>
List: tech-kern
Date: 08/14/1996 09:53:17 
   1) You get some bloat, because those bits of support code are always
   included instead of #ifdef'd out if the option is absent.  There is
   also a speed penalty, because of the added flag checks.

kinda.  gcc will optimise out code that looks like

int foo = 0;

if (foo) {
	...
}

so it will only be a lose if you define the various compat options.