Re: [Qemu-devel] [PATCH] qemu-barrier: Fix compilation on i386 hosts

[Blue Swirl]

On Sat, Oct 6, 2012 at 10:46 AM, Stefan Weil <address@hidden> wrote:
> Commit 610b823ef66b993660f1ab1447a769f190e4f3b3 uses QEMU_GNUC_PREREQ
> on i386 hosts.
>
> That macro is defined in qemu-common.h which is not always included
> before qemu-barrier.h, so compilation on i386 hosts was broken.

This broke sparc-softmmu build on i386:
  CC    sparc-softmmu/hw/vhost_net.o
In file included from /src/qemu/target-sparc/cpu.h:28,
                 from /src/qemu/qemu-common.h:128,
                 from /src/qemu/qemu-barrier.h:9,
                 from /src/qemu/qemu-queue.h:81,
                 from /src/qemu/net.h:4,
                 from /src/qemu/hw/vhost_net.c:16:
/src/qemu/cpu-defs.h:144: error: expected specifier-qualifier-list
before 'QTAILQ_ENTRY'
/src/qemu/cpu-defs.h:151: error: expected specifier-qualifier-list
before 'QTAILQ_ENTRY'

I think the correct fix is to include compiler.h instead.

>
> Signed-off-by: Stefan Weil <address@hidden>
> ---
>
> This patch fixes broken compilation for i386 hosts which
> was reported by the buildbot:
>
> http://buildbot.b1-systems.de/qemu/builders/default_mingw32/builds/396
>
> Regards
>
> Stefan Weil
>
>  qemu-barrier.h |    2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/qemu-barrier.h b/qemu-barrier.h
> index 16f0942..1de914e 100644
> --- a/qemu-barrier.h
> +++ b/qemu-barrier.h
> @@ -6,6 +6,8 @@
>
>  #if defined(__i386__)
>
> +#include "qemu-common.h"        /* QEMU_GNUC_PREREQ */
> +
>  /*
>   * Because of the strongly ordered x86 storage model, wmb() and rmb() are 
> nops
>   * on x86(well, a compiler barrier only).  Well, at least as long as
> --
> 1.7.10
>
>