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Re: [Qemu-devel] spice/qlx: atomic-alignment error with clang-7

From: Paolo Bonzini
Subject: Re: [Qemu-devel] spice/qlx: atomic-alignment error with clang-7
Date: Wed, 18 Jul 2018 17:12:00 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0

On 18/07/2018 16:56, Philippe Mathieu-Daudé wrote:
> Using clang-7 (Debian) on x86_64 to build v3.0.0-rc1.
> Not a regression, it was probably always there:
> $ ./configure --cc=clang-7 && make hw/display/qxl.o
> hw/display/qxl.c:1884:19: error: misaligned or large atomic operation
> may incur significant performance penalty [-Werror,-Watomic-alignment]
>     old_pending = atomic_fetch_or(&d->ram->int_pending, le_events);
>                   ^
> include/qemu/atomic.h:206:34: note: expanded from macro 'atomic_fetch_or'
> #define atomic_fetch_or(ptr, n)  __atomic_fetch_or(ptr, n, __ATOMIC_SEQ_CST)
>                                  ^
> 1 error generated.

Hi, this is fixed in the latest SPICE git.  The upstream commit is




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