linux-kernel - RE: Build failure: -Wno-unused-const-variable DNE on old GCC

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Message-ID: <063D6719AE5E284EB5DD2968C1650D6D1CCC0040@AcuExch.aculab.com>
Date:	Fri, 8 Jan 2016 10:14:52 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Michael Ellerman' <mpe@...erman.id.au>,
	Brian Norris <computersforpeace@...il.com>,
	Ian Munsie <imunsie@....ibm.com>
CC:	Michael Neuling <mikey@...ling.org>, Arnd Bergmann <arnd@...db.de>,
	"Anton Blanchard" <anton@....ibm.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Michal Marek <mmarek@...e.com>,
	linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
	Daniel Axtens <dja@...ens.net>
Subject: RE: Build failure: -Wno-unused-const-variable DNE on old GCC

From: Michael Ellerman
> Sent: 08 January 2016 02:17
> > I doubt you plan to fix all those. So making -Werror configurable seems like
> > the only way forward, then. (Glad you agreed!)
> 
> Yep, I'm happy to make Werror configurable.
> 
> cxl can probably just use the existing PPC_WERROR.

Personally I think the development builds should be done with
both error -Werror and higher levels of warnings, even if the
ones that users tend to do ignore more warnings.

Clearly some warnings that some versions of gcc have included
in -Wall are just a PITA (like warning for __DATE__ and __TIME__).

The kernel headers do need fixing so that they pass compilation
with options like -Wwrite-strings (linux/mm.h doesn't).

	David