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Re: [PATCH v4 04/18] ui: avoid warnings about directdb on Alpine / musl
From: |
Philippe Mathieu-Daudé |
Subject: |
Re: [PATCH v4 04/18] ui: avoid warnings about directdb on Alpine / musl libc |
Date: |
Wed, 15 Dec 2021 12:59:59 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.3.0 |
On 11/24/21 14:42, Daniel P. Berrangé wrote:
> On Wed, Nov 24, 2021 at 02:32:56PM +0100, Thomas Huth wrote:
>> On 24/11/2021 14.01, Daniel P. Berrangé wrote:
>>> On Alpine, SDL is built with directfb support and this triggers warnings
>>> during QEMU build
>>>
>>> In file included from /usr/include/directfb/direct/thread.h:38,
>>> from /usr/include/directfb/direct/debug.h:43,
>>> from /usr/include/directfb/direct/interface.h:36,
>>> from /usr/include/directfb/directfb.h:49,
>>> from /usr/include/SDL2/SDL_syswm.h:80,
>>> from /builds/berrange/qemu/include/ui/sdl2.h:8,
>>> from ../ui/sdl2-gl.c:31:
>>> /usr/include/directfb/direct/os/waitqueue.h:41:25: error: redundant
>>> redeclaration of 'direct_waitqueue_init' [-Werror=redundant-decls]
>>> 41 | DirectResult DIRECT_API direct_waitqueue_init (
>>> DirectWaitQueue *queue );
>>> | ^~~~~~~~~~~~~~~~~~~~~
>>
>> I think that's a bug in the SDL2 package of Alpine. I've had trouble with
>> that one in the past already ... so not sure whether it's our job now to
>> work around bugs in that crappy Alpine package... I'd prefer if we simply do
>> not compile-test SDL on Alpine instead.
>
> It is a harmless bug in directfb headers, which has no ill
> effects other than producing a warning when some app uses
> -Wredundant-decls. Of course Alpine would ideally get this
> patched, but at the same time it is reasonable for Alpine
> users to want SDL and if someone has this package installed
> already we don't want QEMU build to break due to -Werror.
We should avoid adding #pragma directives in generic header,
but I agree -Wredundant-decls is harmless here, so:
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> Case in point, as we auto-generate dockerfiles to ensure
> all pre-requisites are installed in all dockerfiles, the
> Alpine dockerfile gains SDL and exposes this bug. We could
> turn off -Werror but that's a overly big hammer compared
> to this targetted fix.
>
> Regards,
> Daniel
>
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Philippe Mathieu-Daudé <=