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

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Message-ID: <46833311.4000209@zytor.com>
Date:	Thu, 28 Jun 2007 00:03:29 -0400
From:	"H. Peter Anvin" <hpa@...or.com>
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"

Kyle Moffett wrote:
>> 
> 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.
> 

No, you really don't want to do that, because then u64 != uint64_t on 
those platforms.

	-hpa

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