linux-kernel - Re: Why not build kernel with -O3

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Date:	Tue, 07 Apr 2015 14:05:05 -0400
From:	Austin S Hemmelgarn <ahferroin7@...il.com>
To:	Mike Galbraith <umgwanakikbuti@...il.com>,
	Pengfei Yuan <0xcoolypf@...il.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: Why not build kernel with -O3

On 2015-04-07 06:09, Mike Galbraith wrote:
> On Tue, 2015-04-07 at 15:56 +0800, Pengfei Yuan wrote:
>> I am trying legacy GCC versions.
>> But I am not able to try different architectures.
> 
> The point of my reply wasn't to get you to actually test the world ;-)
> 
> I was indirectly pointing out that "works for me" is not good enough 
> justification.  Much checking for safety/benefit required.
> 
Safety especially, -O3 is known to cause perfectly standards-compliant
code to break in weird ways in user-space.



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