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Date: Sat, 07 Mar 2015 12:29:35 +0100
From: Stefan Weil <sw@weilnetz.de>
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Subject: Re: [Qemu-devel] clang warnings too noisy
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To: Paolo Bonzini <pbonzini@redhat.com>, Peter Maydell <peter.maydell@linaro.org>, qemu-devel <qemu-devel@nongnu.org>, Stefan Hajnoczi <stefanha@redhat.com>

Am 07.03.2015 um 12:14 schrieb Paolo Bonzini:
> On 07/03/2015 00:47, Peter Maydell wrote:
>>> 1. It complains about glib headers:
>>> In file included from /home/stefanha/qemu/include/net/eth.h:32:
>>> In file included from /home/stefanha/qemu/include/qemu/iov.h:17:
>>> In file included from /home/stefanha/qemu/include/qemu-common.h:43:
>>> In file included from /home/stefanha/qemu/include/glib-compat.h:19:
>>> In file included from /usr/include/glib-2.0/glib.h:50:
>>> In file included from /usr/include/glib-2.0/glib/ghash.h:33:
>>> In file included from /usr/include/glib-2.0/glib/glist.h:32:
>>> /usr/include/glib-2.0/glib/gmem.h:76:78: warning: unknown attribute
>>> '__alloc_size__' ignored [-Wunknown-attributes]
>>> gpointer g_malloc (gsize n_bytes) __attribute__((__malloc__))
>>> __attribute__((__alloc_size__(1)));
>>>                                                                               ^
>>> /usr/include/glib-2.0/glib/gmem.h:78:79: warning: unknown attribute
>>> '__alloc_size__' ignored [-Wunknown-attributes]
>> I think this is a glib bug...
> If clang supports fewer attributes than GCC, the right course of action
> is disabling the warning on clang.  There are very few attributes that
> are used commonly and that affect ABI; most of them are just annotations.
>
> Paolo

On Debian Jessie I don't get any of those warnings with clang.

I think we can focus clang support on those environmentswhich are
really needed: Mac OS X and Linux with sufficiently new distributions.
Then no action is necessary.

Stefan