Re: [PATCH v3 11/11] x86: support i386 with Clang

[Arnd Bergmann]

On Thu, Jul 23, 2020 at 3:14 PM Sedat Dilek <sedat.dilek@xxxxxxxxx> wrote:
> What happens when there is no CONFIG_64BIT line?
> There exist explicit checks for (and "inverse") of CONFIG_64BIT like
> "ifdef" and "ifndef" or any "defined(...)" and its opposite?
> I remember I have seen checks for it in x86 tree.

As long as you consistently pass ARCH=i386 when running 'make',
nothing bad happens, as ARCH=i386 just hides that option.

If you run "make ARCH=i386 defconfig" followed by "make olddefconfig"
(without ARCH=i386) on a non-i386 machine, the absence of that
CONFIG_64BIT line will lead to the kernel going back to a 64-bit
configuration.

    Arnd