Linus:
quoted text
> Add a directory "/usr/include/non-ansi", and to each file (example
> ctype.h, cdiff type adding):
> 
>   #ifndef _CTYPE_H
>   #define _CTYPE_H
> + #if !defined(__STDC__) && !defined(__GCC__)
> + #include <non-ansi/ctype.h>
> + #else
> 
> ... old ctype.h unchanged (except for the bug-fix, see below)
> 
> + #endif /* __STDC__ */
>   #endif /* _CTYPE_H */
> 
> That way we can keep the non-ansi headers distinct.  Anybody got
> something against this? I'd suggest Blum do all the hard work :-) and
> set cdiffs somewhere? No? The non-ansi files could be a part of the C386
> package, and not everyone would need them. 

Wouldn't it be easier to make two header trees:

	/usr/include/ansi
	/usr/include/classic

and either use the -I option to select which tree is used, or put
files like this:

	#if __STDC__ == 1	/* not: not just ifdef; see comp.lang.c FAQ */
	#  include <ansi/foo.h>
	#else
	#  include <classic/foo.h>
	#endif

into /usr/include.

This would IMHO be more neat than your proposed solution.