At 10:48 AM -0800 3/8/03, Marcel Moolenaar wrote:
On Sat, Mar 08, 2003 at 12:28:13PM -0500, Garrett Wollman wrote:
> `#if __GNUC__' wouldn't help matters; every preprocessor has to
> read and interpret every preprocessor directive (so that `#else'
> and `#endif' can be recognized).
I don't think preprocessors should interpret directives when they
are dead (ie part of an #if block or #else block that is not to
be compiled).
I tried to use this once, on a cross-platform program I wrote. I
can tell you that some compilers will choke on a #warning, even if
it is inside a #if/#endif. And other compilers will choke on #warn,
even if *it* is in a #if/#endif. (note: some compilers which do not
recognize #warning will support #warn for the same thing).
By adding that #warning, you are going to have a compile-time error
on some compilers, whether or not you want it. Hiding it inside of
an #if/#endif will help for some compilers, but not on all of them.
--
Garance Alistair Drosehn = [EMAIL PROTECTED]
Senior Systems Programmer or [EMAIL PROTECTED]
Rensselaer Polytechnic Institute or [EMAIL PROTECTED]
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