Re: Why not build kernel with -O3

From: Austin S Hemmelgarn
Date: Tue Apr 07 2015 - 14:05:16 EST

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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