netdev - Re: [PATCH] ath: wil6210: Fix build error

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Date:	Mon, 22 Jul 2013 02:45:43 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Vladimir Kondratiev <qca_vkondrat@....qualcomm.com>
Cc:	thomas@...llstrom.ca, Larry Finger <Larry.Finger@...inger.net>,
	linville@...driver.com, linux-wireless@...r.kernel.org,
	netdev@...r.kernel.org, wil6210@....qualcomm.com,
	Stable <stable@...r.kernel.org>
Subject: Re: [PATCH] ath: wil6210: Fix build error

On Sun, 2013-07-21 at 18:52 +0300, Vladimir Kondratiev wrote:
> On Sunday, July 21, 2013 09:35:40 AM Thomas Fjellstrom wrote:
> > If it helps, I'm running a fresh install of Debian Sid with gcc 4.8.1. I've 
> > noticed that each newer successive version of gcc gets more strict with what 
> > code it accepts without warning, or error. A lot of my only somewhat old code 
> > tends to have a lot more warnings. Especially that signedness warning.
> 
> Yes, this is the case; I have 4.7.3
> 
> > 
> > It also looked like that that driver or section of the kernel was compiling 
> > with -Werror. I haven't verrified that but I remember seeing "treating all 
> > warnings as errors" at one point.
> > 
> You are right, I have this in Makefile:
> (if one turn on extra warnings with -W, there will be lots of false alarms,
> that's why this ifeq())
> 
> ifeq (, $(findstring -W,$(EXTRA_CFLAGS)))
> 	subdir-ccflags-y += -Werror
> endif

This is a pretty weird thing to do, and you've failed to account for
-Wextra.

-Werror is generally a bad default in free software, as you have no
control over which compiler version will be used.

Ben.

-- 
Ben Hutchings
Once a job is fouled up, anything done to improve it makes it worse.

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