Date: Tue, 20 Mar 2001 14:35:08 -0500 From: Andrew Brown <atatat@atatdot.net> To: Greywolf <greywolf@starwolf.com> Cc: Shankar Agarwal <shankar_agarwal@net.com>, tech-kern@netbsd.org, bsd hackers <freebsd-hackers@FreeBSD.ORG> Subject: Re: Question regarding the array of size 0. Message-ID: <20010320143508.A29869@noc.untraceable.net> In-Reply-To: <Pine.NEB.4.30.0103201101010.5239-100000@starjumper.starwolf.com>; from greywolf@starwolf.com on Tue, Mar 20, 2001 at 11:31:40AM -0800 References: <3AB7A76B.2BCF5D6E@net.com> <Pine.NEB.4.30.0103201101010.5239-100000@starjumper.starwolf.com>
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On Tue, Mar 20, 2001 at 11:31:40AM -0800, Greywolf wrote:
>On Tue, 20 Mar 2001, Shankar Agarwal wrote:
>
># Date: Tue, 20 Mar 2001 10:54:35 -0800
># From: Shankar Agarwal <shankar_agarwal@net.com>
># To: tech-kern@netbsd.org
># Cc: bsd hackers <freebsd-hackers@FreeBSD.ORG>
># Subject: Question regarding the array of size 0.
>#
># Hi All,
># #define syscallarg(x) \
># union { \
># register_t pad; \
># struct { x datum; } le; \
># struct { \
># int8_t pad[ (sizeof (register_t) < sizeof (x)) \
># ? 0 \
># : sizeof (register_t) - sizeof (x)]; \
># x datum; \
># } be; \
># }
>#
># struct sys_exit_args {
># syscallarg(int) rval;
># };
>
>I thought ?: were evaluated at run-time, not compile-time?
any halfway decent optimizing compiler ought to be reducing the number
of useless constants in its output, this being an example of such.
--
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