Date: Tue, 20 Mar 2001 11:31:40 -0800 (PST) From: Greywolf <greywolf@starwolf.com> To: Shankar Agarwal <shankar_agarwal@net.com> Cc: <tech-kern@netbsd.org>, bsd hackers <freebsd-hackers@FreeBSD.ORG> Subject: Re: Question regarding the array of size 0. Message-ID: <Pine.NEB.4.30.0103201101010.5239-100000@starjumper.starwolf.com> In-Reply-To: <3AB7A76B.2BCF5D6E@net.com>
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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,
# I am getting the following array while trying to compile uipc_syscalls.c
# file.
# /vobs/atm/netbsd/sys/sys/syscallargs.h", line 30: zero or negative
# subscript
# This is because the code in syscallargs.h is defining an array of size
# 0.
# The code that is creating problem is
# #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?
--*greywolf;
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