From: Avi Kivity <avi@redhat.com>
To: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [5466] Only use __builtin_* with GCC >= 3.4
Date: Sun, 12 Oct 2008 17:02:43 +0200 [thread overview]
Message-ID: <48F21193.3000809@redhat.com> (raw)
In-Reply-To: <20081012142348.GA18814@shareable.org>
Jamie Lokier wrote:
> Glibc uses "#if __GNUC_PREREQ (3,4)" which is quite neat.
> Do "grep -R GNUC_PREREQ /usr/include".
>
> I use (and define if not already defined) the same macro in my
> programs, on the assumption that the macro's meaning is unlikely to
> ever change or be different elsewhere.
>
It's illegal to define or use an identifier beginning with two
underscores, unless it's documented by the implementation. What if
glibc adds a third argument? All your apps wil break.
You should define your own macros for this, with a non-__ name.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2008-10-12 15:02 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-12 11:44 [Qemu-devel] [5466] Only use __builtin_* with GCC >= 3.4 Aurelien Jarno
2008-10-12 12:33 ` Avi Kivity
2008-10-12 14:23 ` Jamie Lokier
2008-10-12 15:02 ` Avi Kivity [this message]
2008-10-12 15:33 ` Jamie Lokier
2008-10-12 19:10 ` M. Warner Losh
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