linux-kernel - Re: UB in general ... and linux/bitops.h in particular

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Message-ID: <CAH8yC8kmo-m1roQT2PjavVp=cN=L5BcbVn+nZo6HM8-Jn90Ydg@mail.gmail.com>
Date:	Thu, 5 May 2016 22:25:16 -0400
From:	Jeffrey Walton <noloader@...il.com>
To:	John Denker <jsd@...n.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, "Theodore Ts'o" <tytso@....edu>,
	linux-kernel@...r.kernel.org,
	Stephan Mueller <smueller@...onox.de>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Andi Kleen <andi@...stfloor.org>,
	Sandy Harris <sandyinchina@...il.com>,
	cryptography@...edaemon.net, linux-crypto@...r.kernel.org
Subject: Re: UB in general ... and linux/bitops.h in particular

>    -- Perhaps the compiler guys could be persuaded to support
>     the needed features explicitly, perhaps via a command-line
>     option: -std=vanilla
>     This should be a no-cost option as things stand today, but
>     it helps to prevent nasty surprises in the future.

It looks LLVM has the -rainbow option; see
http://blog.llvm.org/2016/04/undefined-behavior-is-magic.html :)

Jeff