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From: Marcel Apfelbaum <marcel.a@redhat.com>
Date: Tue, 18 Mar 2014 16:27:10 +0200
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Subject: Re: [Qemu-devel] [PATCH for-2.0] vl.c: Fix OpenBSD compilation
 issue due to namespace collisions
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To: Peter Maydell <peter.maydell@linaro.org>
Cc: Brad Smith <brad@comstyle.com>, QEMU Developers <qemu-devel@nongnu.org>, Anthony Liguori <aliguori@amazon.com>, Andreas =?ISO-8859-1?Q?F=E4rber?= <afaerber@suse.de>

On Tue, 2014-03-18 at 16:05 +0200, Marcel Apfelbaum wrote:
> On Tue, 2014-03-18 at 13:57 +0000, Peter Maydell wrote:
> > On 18 March 2014 13:39, Marcel Apfelbaum <marcel.a@redhat.com> wrote:
> > > Machine rewriting added MACHINE macro which is
> > > already in use by other OpenBSD library.
> > > Since qemu/sockets.h exposes the OpenBSD namespace,
> > > the minimalistic approach is to add it as the first QEMU include.
> > >
> > > Reported-by: Brad Smith <brad@comstyle.com>
> > > Signed-off-by: Marcel Apfelbaum <marcel.a@redhat.com>
> > > ---
> > >  vl.c | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > >
> > > diff --git a/vl.c b/vl.c
> > > index f0fe48b..9f86e68 100644
> > > --- a/vl.c
> > > +++ b/vl.c
> > > @@ -58,6 +58,7 @@ int main(int argc, char **argv)
> > >
> > >  #include <glib.h>
> > >
> > > +#include "qemu/sockets.h"
> > >  #include "hw/hw.h"
> > >  #include "hw/boards.h"
> > >  #include "hw/usb.h"
> > > @@ -103,7 +104,6 @@ int main(int argc, char **argv)
> > >
> > >  #include "disas/disas.h"
> > >
> > > -#include "qemu/sockets.h"
> > >
> > >  #include "slirp/libslirp.h"
> > 
> > I'm confused; why doesn't this just result in a compiler
> > error in the other direction when we try to #define
> > MACHINE in QEMU and it's already been defined by
> > the BSD headers?
> Maybe because there is usage of the "MACHINE" define by the BSD
> library? (on Qemu context, of course! - meaning, it shouldn't even be
> exposed in the first place!)
I meant "there is *no* usage of the..."

> 
> Thanks,
> Marcel
> 
> > 
> > thanks
> > -- PMM
> 
>