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how to build ubuntu for arm64? (how to give ARCH and CROSS_COMPILE variable to `debian/rules` command)

za flag
Chan Kim

I downloaded ubuntu source by git clone git://kernel.ubuntu.com/ubuntu/ubuntu-focal.git.
and according to https://wiki.ubuntu.com/Kernel/BuildYourOwnKernel and the included build process for arm, I did this:

LANG=C fakeroot debian/rules clean  
LANG=C fakeroot debian/rules binary-headers binary-generic binary-perarch

I had exported ARCH=arm64 CROSS_COMPILE=aarch64-none-elf or
ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- before the commands, or with the command but it ended with errors at the end. One of the error message was You are building kernel with non-retpoline compiler, please update your compiler and I saw I can fix it by changing configuration(building kernel with non-retpoline compiler). So I tried

LANG=C fakeroot debian/rules editconfigs

But it asks me Do you want to edit config: amd64/config.flavour.generic? when I'm doing it for arm64 architecture. I tried giving ARCH and CROSS_COMPILE option but it always asks me if I want to change amd64 configuration. How can I give it the ARCH and CROSS_COMPILE option for this fakeroot debian/rules build method?

p.s. my toolchain info.

aarch64-linux-gnu-gcc (Linaro GCC 7.5-2019.12) 7.5.0
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

or

aarch64-none-elf-gcc (GNU Toolchain for the A-profile Architecture 9.2-2019.12 (arm-9.10)) 9.2.1 20191025
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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JoKeR avatar
mm flag
JoKeR
May be good to ask here https://unix.stackexchange.com/
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za flag
Chan Kim
@JoKeR thanks it seems so. I asked it there and when I get answer, I'll cross link so that people can get answer anyway. (https://unix.stackexchange.com/questions/656263/how-to-build-ubuntu-for-arm64-how-to-give-arch-and-cross-compile-variable-to)
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za flag
Chan Kim
The answer is here : https://unix.stackexchange.com/questions/656263/how-to-build-ubuntu-for-arm64-how-to-give-arch-and-cross-compile-variable-to
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