How do I use to clear a kernel build?

When I build the kernel with./ -o $PWD/kernel_out, it reports the following error.

But when I want to clear the kernel I don’t know how to do that, right. -h has only the following two prompts.

How do I do that? I want to make clean the compilation.

Hi, you may simply delete the kernel_out folder and start building again.

After I ran make ARCH=arm64 mrproper in the [KERNEL] source directory as prompted, the problem was resolved and the kernel could continue compiling. My simple removal of the kernel_out directory did not work completely.

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