linux-kernel - Re: [tip:perfcounters/core] perf: Enable more compiler warnings

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Message-ID: <20090816151829.GA8116@elte.hu>
Date:	Sun, 16 Aug 2009 17:18:29 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	mingo@...hat.com, hpa@...or.com, paulus@...ba.org, acme@...hat.com,
	linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl,
	efault@....de, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perfcounters/core] perf: Enable more compiler warnings


* Frederic Weisbecker <fweisbec@...il.com> wrote:

> On Sun, Aug 16, 2009 at 08:57:54AM +0000, tip-bot for Ingo Molnar wrote:
> > Commit-ID:  83a0944fa919fb2ebcfc1f8933d86e437b597ca6
> > Gitweb:     http://git.kernel.org/tip/83a0944fa919fb2ebcfc1f8933d86e437b597ca6
> > Author:     Ingo Molnar <mingo@...e.hu>
> > AuthorDate: Sat, 15 Aug 2009 12:26:57 +0200
> > Committer:  Ingo Molnar <mingo@...e.hu>
> > CommitDate: Sun, 16 Aug 2009 10:47:47 +0200
> > 
> > perf: Enable more compiler warnings
> > 
> > Related to a shadowed variable bug fix Valdis Kletnieks noticed
> > that perf does not get built with -Wshadow, which could have
> > helped us avoid the bug.
> > 
> > So enable -Wshadow and also enable the following warnings on
> > perf builds, in addition to the already enabled -Wall -Wextra
> > -std=gnu99 warnings:
> > 
> >  -Wcast-align
> >  -Wformat=2
> 
> 
> I also have code like the following from perf trace:
> 
> char format[32];
> [...]
> 
> memcpy(format, dynamic_built_format, ...)
> 
> printf(format, ....)
> 
> And that triggers warnings like that:
> 
> util/trace-event-parse.c:2280: error: format is not a literal string, argument types can't be checked
> 
> Do we also want these?
> 
> ftrace uses dynamic format definition, and it's a natural way to 
> copy them from debugfs and then used like that.
> 
> Especially here perf trace checked the format against bad things.

ok, lets turn the format warnings off.

	Ingo
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