Re: Possibility of adding -march=native to x86

["H. Peter Anvin" <hpa@zytor.com>]

Adrian Bunk wrote:
> > >
> > Yes for something like a distro kernel it is bad but as I said before
> > this isn't what this is for.
> >
> > Eventually it would be nice to to a make localkernel and for a
> > customised kernel to be build compiling in all pci / pci express
> > drivers into the kernel and all usb devices as modules.
> >
> > Auto magically detecting the cpu would be part of that
> >
> > I hate getting a new piece of kit and then have to figure out from
> > lspci which options need to be turned on and the the really iritation
> > part of finding the option in make menuconfig
>
> What exactly is irritating?
> Please name the problems so that they can be fixed.
>
> > Detecting the cpu and using march=native could be all part of that
>
> You don't need march=native for this.
>
> You have to set the right config option for your CPU and you 
> automatically get the right compiler options.

There was a long discussion years ago -- the infamous "Aunt Tillie" 
thread -- about automatically configuring customized kernels for 
specific hardware.

It's somewhat of an unusual thing to bother with these days, except for 
people who develop and maintain the kernel.

	-hpa
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