linux-kernel - Re: [PATCH] Add spaces on either side of case "..." operator.

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Message-ID: <461BCDA9.2060206@goop.org>
Date:	Tue, 10 Apr 2007 10:47:21 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	"Robert P. J. Day" <rpjday@...dspring.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Add spaces on either side of case "..." operator.

Andrew Morton wrote:
> #define AUDIT_FIRST_USER_MSG    1100    /* Userspace messages mostly uninteresting to kernel */
> #define AUDIT_USER_AVC          1107    /* We filter this differently */
> #define AUDIT_LAST_USER_MSG     1199
>
> and CPP turns that into
>
>  case 1100 ...1199:
>  case 2100 ...2999:
>
> and it does the same when the comments are stripped from the #defines.
>
> So we were saved by the trailing space which cpp added to the expanded
> macro.  I wonder why cpp did that, and to what extent one can rely cpp
> doing that.

I think its required to.  If it didn't, it would be effectively pasting
two tokens together without the ## operator.  But putting spaces in is
safer - or putting () around the numbers.

    J
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