I tested a LePotato, which is an Aarch64 dev-board from the same maker
(https://www.amazon.com/gp/product/B074N5B8KZ). Here are the results.
They look OK:

    $ gcc -dumpmachine
    aarch64-linux-gnu

    $ clang -dumpmachine
    aarch64-unknown-linux-gnu

I also gave Autotools a spin with an updated config.sub. Autotools
rewrites the triplet and provides an accurate machine:

    armv7l-unknown-linux-gnueabihf

The -dumpmachine option is very important. It is the option that tells
us what we are building for. It may be different than the host
architecture. Personally, I don't care about the host arch and cross-
compiles. Everything is just a compile to me, and all GNUmake and
Autoconf decisions are based on MACHINE in the triplet.

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https://bugs.launchpad.net/bugs/1827175

Title:
  armv8l-unknown-linux-gnueabihf triplet from clang -dumpmachine on
  ARMv7l

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