Sorry for delay....
I wrote:

> In order to avoid this sort of mistakes, I propose the following
> patch to gcc and to add -Wabi-breakage to library/kernel makefiles.
> We already have -Werror and if we write library/kernel in current KNF,
> breaking ABI becomes impossible.

I tried this out and found bunches of functions which take
float arguments in libm.

What to do with these K&R-incompatible functions?
-- 
ITOH, Yasufumi <itohy@netbsd.org>