linux-kernel - Re: Userspace compiler support of "long long"

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Date:	Thu, 28 Jun 2007 02:30:42 +0200
From:	Andi Kleen <ak@...e.de>
To:	Kyle Moffett <mrmacman_g4@....com>
Cc:	Adrian Bunk <bunk@...sta.de>,
	LKML Kernel <linux-kernel@...r.kernel.org>,
	David Woodhouse <dwmw2@...radead.org>, david@...g.hm,
	linux-arch@...r.kernel.org
Subject: Re: Userspace compiler support of "long long"

On Thursday 28 June 2007 00:30:52 Kyle Moffett wrote:
> On Jun 27, 2007, at 13:32:40, Adrian Bunk wrote:
> > AFAIR the Intel compiler claims to be gcc.
> >
> > But these are by far not the only C compilers under Linux, and the  
> > more important points are:
> >
> > Is there any userspace Linux compiler that does not support "long  
> > long"?
> 
> Don't know, but I'd guess not.

Tendra C and probably lcc. I would guess tinycc too.

> The only trick is if you care about building 32-bit compat code using  
> 64-bit linux kernel headers.  In that case we should probably just  
> make all archs use "long long" for their 64-bit integers, unless  
> there's some platform I'm not remembering where "long long" is 128- 
> bits or bigger.  The other benefit is that people could then just use  
> the printf format "%llu" for 64-bit integers instead of having to  
> conditionalize it all over the place.
> 
> I'm working on a patch now.

Changing this will give you a zillion warnings for printk formats.

-Andi
 
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