> > Well, I actually disagree on this. For large include files (fs.h is the
> > worst), and complicated arrangement, this technique eliminates spurious
> > includes and saves a lot on compile time (really!).
>
> Numbers please.
The GNU C preprocessor remembers if an include file was completely
inside an #ifndef/#endif conditional (modulo whitespace and comments)
and will skip the #include for the same file if the macro in #ifndef is
already defined. I suspect putting guards around the include will not
save any more time.
bfn,
Christopher Turcksin <turcksin@uk.ibm.com>
IBM Global Services
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/