linux-kernel - Re: [PATCH 1/1] kconfig: fix lists definition for C++

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Date:	Mon, 29 Apr 2013 17:57:43 -0500
From:	Rob Landley <rob@...dley.net>
To:	"Yann E. MORIN" <yann.morin.1998@...e.fr>
Cc:	Randy Dunlap <rdunlap@...radead.org>, linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-next@...r.kernel.org,
	Michal Marek <mmarek@...e.cz>,
	Benjamin Poirier <bpoirier@...e.de>
Subject: Re: [PATCH 1/1] kconfig: fix lists definition for C++

On 04/29/2013 05:30:54 PM, Yann E. MORIN wrote:
> Rob, All,
> 
> On Mon, Apr 29, 2013 at 04:54:14PM -0500, Rob Landley wrote:
> > On 04/29/2013 02:28:07 PM, Randy Dunlap wrote:
> > >On 04/29/13 10:59, Yann E. MORIN wrote:
> > >> From: "Yann E. MORIN" <yann.morin.1998@...e.fr>
> > >>
> > >> The C++ compiler is more strict in that it refuses to assign
> > >> a void* to a struct list_head*.
> >
> > Given that the code _isn't_ C++ (because C is not a subset of C++  
> but a
> > separate langauge in its own right where "throw" is a legitimate  
> variable
> > name and so on), how is this an issue?
> 
> It's an issue because the xconfig frontends is qconf, which as the  
> name
> implies is using Qt, which *is* C++, and includes list.h.
> 
> So, list.h is included by both by C and C++ code.
> 
> So yes, list.h can be compiled by a C++ compiler.
> 
> Now, granted: list.h should all be enclosed in:
>     ifdef __cpluplus
>     extern "C" {
>     endif
>     ...
>     ifdef __cpluplus
>     }
>     endif
> 
> Was that the fix you were suggesting between the lines? ;-)

It does more clearly document the issue. (A comment about the QT  
front-end would also be nice. I don't use that one, so I didn't think  
of it.)

Thanks,

Rob--
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