Re: [Xen-devel] [PATCH] xen: Deal with stdarg.h and -nostdinc

[Christoph Egger <Christoph.Egger@xxxxxxx>]

On 05/26/11 18:11, Ian Jackson wrote:
> Christoph Egger writes ("[Xen-devel] [PATCH] xen: Deal with stdarg.h and 
> -nostdinc"):
> > For compiling the xen kernel we use -nostdinc which means
> > we don't want to rely on any external headers.
> > That also counts for stdarg.h.
> Right, OK, but:
>
> > Use the external header when we compile the tools.
> > Adapt libelf-loader.c which is compiled in the kernel
> > and with the tools.
> -#include<stdarg.h>
> +#include "../../include/xen/stdarg.h"
>
> Firstly, is this correct for all uses of libelf-loader ?  This file is
> compiled both for use inside Xen and for use on the host.  In the
> latter case it /should/ use the system's stdarg.h.
This is exactly what happens in conjunction with the other diff.
In the first case there is __XEN__ defined and in the latter case
__XEN__ is *not* defined.

> Also, this kind of relative path should not be necessary.  The
> relevant files should be on the include path.
I tried <xen/stdarg.h> but then compiling the tools failed.

> So I think this should be fixed by arranging that your new stdarg.h is
> on the relevant include path, not by changing the .c file.
>
> Ian.

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