Re: [PATCH] audo-detect and use -moutline-atomics compilation flag for aarch64

> Apply it, and run "make check-world" on focal. The others should be
> unaffected since the flag is on by default.

Here are the steps in my testing on focal - ubuntu 20.04:

git clone https://github.com/postgres/postgres
cd postgres
patch -p1 < a.diff
autoconf
make
make check-world

All checks passed on a c6g Graviton2 instance.

configure.in was renamed configure.ac in July 2020.
For older postgresql versions we need to patch configure.in.
See attached the patch a.diff that I used on trunk postgresql.

Thanks,
Sebastian