march=native target?

[Markus Trippelsdorf <markus@xxxxxxxxxxxxxxx>]

Wouldn't it be a good idea to add a "march=native" target to
Kconfig.cpu, so that a user doesn't have to select a specific processor
family and automatically gets the best support for his native
architecture?

(I'm asking because I use a AMD K10 processor and there is only a K8
target in kconfig. Changing k8 to native in arch/x86/Makefile produces
better code AFAICT by looking at the assembler output side by side)

-- 
Markus
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