linux-kernel - Re: [PATCH 27/27] Fix PTRDIFF_MIN/PTRDIFF_MIN and PTRDIFF

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Date:	Tue, 21 Jun 2016 10:32:42 +0000
From:	Joseph Myers <joseph@...esourcery.com>
To:	Yury Norov <ynorov@...iumnetworks.com>
CC:	<libc-alpha@...rceware.org>, <linux-kernel@...r.kernel.org>,
	<arnd@...db.de>, <catalin.marinas@....com>,
	<marcus.shawcroft@....com>, <philb@....org>, <davem@...emloft.net>,
	<szabolcs.nagy@....com>, <maxim.kuvyrkov@...aro.org>,
	<pinskia@...il.com>, Andrew Pinski <apinski@...ium.com>
Subject: Re: [PATCH 27/27] Fix PTRDIFF_MIN/PTRDIFF_MIN and PTRDIFF_MIN for
 ILP32.

On Tue, 21 Jun 2016, Yury Norov wrote:

> +#  ifdef __WORDSIZE32_PTRDIFF_LONG
> +#    define PTRDIFF_MIN		(-2147483647L-1)
> +#    define PTRDIFF_MAX		(2147483647L)
> +#  else
> +#    define PTRDIFF_MIN		(-2147483647-1)
> +#    define PTRDIFF_MAX		(2147483647)

We now use typo-proof conventions, preferring #if to #ifdef.  That is, 
make other bits/wordsize.h files define the macro to 0, so you can use #if 
here.

-- 
Joseph S. Myers
joseph@...esourcery.com