linux-kernel - Re: [PATCH] Kbuild: Disable the -Wformat-security gcc flag

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Message-ID: <jeab91w54x.fsf@sykes.suse.de>
Date:	Thu, 05 Feb 2009 11:27:10 +0100
From:	Andreas Schwab <schwab@...e.de>
To:	Floris Kraak <randakar@...il.com>
Cc:	Roland Dreier <rdreier@...co.com>,
	Robert Hancock <hancockrwd@...il.com>,
	Sam Ravnborg <sam@...nborg.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Trivial Patch Monkey <trivial@...nel.org>
Subject: Re: [PATCH] Kbuild: Disable the -Wformat-security gcc flag

Floris Kraak <randakar@...il.com> writes:

> Example:
>
> kernel/power/main.c:717: warning: format not a string literal and no
> format arguments
>
> This complains about:
> ..
>         if (!rtc) {
>                 printk(warn_no_rtc);
>                 goto done;
>         }
> ..
>
> So what is this "warn_no_rtc" thing?
>
>         static char             warn_no_rtc[] __initdata =
>                 KERN_WARNING "PM: no wakealarm-capable RTC driver is ready\n";

Does it help to make it const?

> That's pretty much GCC failing to recognize that the format is a
> string literal and then complaining that it isn't.

Since it's a non-const variable it cannot be a string literal.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@...e.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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