From: René Scharfe <l.s.r@web.de>
Date: Sun, 16 Jul 2017 11:02:46 GMT
Subject: Re: [PATCH 5/5] Makefile: disable unaligned loads with UBSan
Message-ID: <840f246f-e735-2a84-d9b9-95d8e4a9d99c@web.de>
In-Reply-To: <20170716101744.2g3x7v2dtasg45ll@sigill.intra.peff.net>

Am 16.07.2017 um 12:17 schrieb Jeff King:
> On Sat, Jul 15, 2017 at 07:18:56PM +0200, René Scharfe wrote:
> 
>> -- >8 --
>> Subject: [PATCH] Makefile: allow combining UBSan with other sanitizers
>>
>> Multiple sanitizers can be specified as a comma-separated list.  Set
>> the flag NO_UNALIGNED_LOADS even if UndefinedBehaviorSanitizer is not
>> the only sanitizer to build with.
> 
> Nice, I didn't know you could do comma-separation here. ;)
> 
> I always just built the various sanitizers separately since I was
> testing whether each one worked. But if we can get UBSan to build
> cleanly, I agree that "make SANITIZE=address,undefined test" would be a
> nice thing to run periodically.

There are *some* restrictions: You can only use one of address, memory
and thread, as mentioned here:

http://clang.llvm.org/docs/UsersManual.html#controlling-code-generation

Combining ASan and UBSan works fine.

René