[PATCH] riscv: fix build with binutils 2.38

[Linus Torvalds]

On Thu, Mar 31, 2022 at 3:51 AM Marc Kleine-Budde <mkl at pengutronix.de> wrote:
>
> Cc += linux-sparse, Uwe, Luc Van Oostenryck
>
> tl;dr:
>
> A recent change in the kernel regarding the riscv -march handling breaks
> current sparse.

Gaah. Normally sparse doesn't even look at the -march flag, but for
riscv it does, because it's meaningful for the predefined macros.

Maybe that 'die()' shouldn't be so fatal. And maybe add a few more
extensions (but ignore them) to the parsing.

Something ENTIRELY UNTESTED like the attached.

               Linus
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