From: Paolo Bonzini <pbonzini@redhat.com>
To: Stefan Hajnoczi <stefanha@gmail.com>
Cc: QEMU Trivial <qemu-trivial@nongnu.org>,
Stefan Weil <sw@weilnetz.de>,
Anthony Liguori <aliguori@us.ibm.com>,
qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH] vnc: Fix packed boolean struct members
Date: Thu, 08 Mar 2012 17:08:01 +0100 [thread overview]
Message-ID: <4F58D961.70706@redhat.com> (raw)
In-Reply-To: <CAJSP0QXAc5S6dvh-6EJkL8RNfDCkD=7QcbT0DMZTiS5D+xTQsg@mail.gmail.com>
Il 08/03/2012 16:26, Stefan Hajnoczi ha scritto:
> I had to drop this patch from the trivial patches tree, it tickles a
> new gcc warning. Please resend with the necessary change.
>
> I cannot reproduce it on my build host here with gcc Debian 4.6.2-12
> but Anthony reports the following Ubuntu/Linaro 4.5.2-8ubuntu4:
>
> CC ui/vnc-auth-sasl.o
> cc1: warnings being treated as errors
> /home/anthony/git/qemu/ui/vnc-auth-sasl.c: In function
> ‘vnc_sasl_client_cleanup’:
> /home/anthony/git/qemu/ui/vnc-auth-sasl.c:34:9: error: suggest
> parentheses around assignment used as truth value
> make: *** [ui/vnc-auth-sasl.o] Error 1
Looks like a GCC bug where
x = y = 0;
is converted to
x = (y = 0) != 0;
and the magic that does this inside the compiler causes the warning.
We should add a configure check to only add -Werror on compilers newer
than X (for example X could leave out GCC 4.5), so that this patch can
be reapplied.
Paolo
next prev parent reply other threads:[~2012-03-08 16:08 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-25 13:35 [Qemu-devel] [PATCH] vnc: Fix packed boolean struct members Stefan Weil
2012-03-05 13:15 ` Stefan Hajnoczi
2012-03-08 15:26 ` Stefan Hajnoczi
2012-03-08 16:08 ` Paolo Bonzini [this message]
2012-03-08 16:25 ` Anthony Liguori
2012-03-08 18:07 ` Paolo Bonzini
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