linux-kernel - Re: [PATCH] Clarify error on directive in macro arguments (Re: [PATCH] jffs2: fix sparse errors: directive in argument list)

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Message-ID: <20131118040100.GE8043@ringworld.MIT.EDU>
Date:	Sun, 17 Nov 2013 23:01:00 -0500
From:	Greg Price <price@....EDU>
To:	Joe Perches <joe@...ches.com>
Cc:	Al Viro <viro@...IV.linux.org.uk>,
	Christopher Li <sparse@...isli.org>,
	Erico Nunes <nunes.erico@...il.com>,
	linux-sparse@...r.kernel.org, dwmw2 <dwmw2@...radead.org>,
	linux-mtd <linux-mtd@...ts.infradead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Clarify error on directive in macro arguments (Re:
 [PATCH] jffs2: fix sparse errors: directive in argument list)

On Sun, Nov 17, 2013 at 06:15:32PM -0800, Joe Perches wrote:
> On Sun, 2013-11-17 at 21:07 -0500, Greg Price wrote:
> > Perhaps the following tweak to the error message would make this
> > subtlety clearer?
> 
> Maybe, but this case isn't a macro.  It's a function.
> Dunno if differentiating when it's a macro or a
> function is difficult though.

Yeah, this error message is already only emitted for directives in
macro arguments -- in this case, pr_info.  It's in sparse's
preprocessor code; the error arises when a directive is spotted while
parsing a macro's arguments.  By the time sparse (or an idealized C
compiler) parses the arguments of a real function, the token stream is
already the output of the preprocessor and any directives are gone.

Cheers,
Greg
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