From: Farley Flud <ff@linux.rocks>
Subject: Re: Fine. (was: Re: C Non-Programming Non-Challenge)
Newsgroups: comp.os.linux.advocacy
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Date: Tue, 18 Jun 2024 22:39:46 +0000
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On 18 Jun 2024 21:55:47 GMT, vallor wrote:

>  
>  ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
> -KBUILD_CFLAGS += -O2
> +KBUILD_CFLAGS += -O3 -march=native
>

That's not passing flags that's directly modifying the source
code, and it may have side effects (I don't know).

AFAIK, the kernel build has no method for the user to pass
custom gcc flags.

If I am wrong, then provide a link that describes the process.