Re: Why not build kernel with -O3

[Austin S Hemmelgarn]

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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