cpp vs. m4 for .s files

[Lawrence Plona]

Although this has nothing to do with which is the better pre-processor,
the 3.2 man page for cpp says not to use it because cpp is part of cc
and is subject to change without notice. The cpp man page does not
appear in the 4.0 documentation.
-- 

Sit denique inscriptum in fronte unius  "Let it finally be written on
cuiusque quid de rebus publicis sentiat  the forehead of each man what he
- Cicero                                 thinks of open systems"