Re: Rewriting kernel config after generation

[Alexey Dobriyan]

On Fri, Dec 2, 2011 at 7:33 AM, Alexey Dobriyan <adobriyan@xxxxxxxxx> wrote:
> I'm trying to add compiling with -march=native to the kernel.
> The problem is that then some config options become discoverable at
> the beginning of the compilation. For example,
> CONFIG_X86_L1_CACHE_SHIFT=6 can be derived from "--param l1-cache-line-size=64".
> I suspect this is no-go, because all the dependency logic must be
> duplicated somewhere else (in the march=native script) for the above
> to work.
>
> Is there any cleaner way I'm missing?
>
> In theory, such script could even turn off CONFIG_CPU_SUP_AMD
> if it detects Intel CPU.

Hrph, this is harder than it looks because "silentoldconfig" is done at
the beginning rewriting whatever changes done to .config by hand. :-(
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