Development version of BIND 9 - 9.21.10 with meson build system

[Havard Eidnes]

> With ld.elf_so compiled with DEBUG and LD_DEBUG set in the
> environment, attempts at executing dig out of the build directory
> is met with
>
> _rtld_error: /usr/local/src/bind-9.21.12/build-dir/.//libdns-9.21.12.so: wrong number of segments (4 != 2)
>
> Applying the change from
>
>   https://mail-index.netbsd.org/source-changes/2023/01/06/msg142652.html
>
> to ld.elf_so and rebuild & re-install fixes both issues [...]

It looks like the use of "-Wl,-z,separate-code" is the one which
is responsible for bumping the number of LOAD segments in the
shared libraries from 2 to 4.

There are several paths out of that situation:

1) On NetBSD, insist on NetBSD >= 11.0_BETA.  The fix above is
   part of what's in 11.0_BETA.  I've not verified this myself
   yet.

2) On NetBSD, and on NetBSD < 11.0_BETA, drop the usage of that
   linker option.  Requires meson magic above my current
   abilities.

2b) Or ... insist that users otherwise matching #2 manually edit
   out that option from meson.build.  Obviously that's a less
   desireable "solution".

3) Apply the above patch to netbsd-10, and wait for the next 10.x
   release for the fix availability.  There's a non-zero chance
   that this change interacts badly with other features (TLS on
   arm, e.g.) that it's not a straight-forward solution to apply
   this fix without "more engineering".  The focus in the NetBSD
   camp is more on netbsd-11 and getting that into a release-able
   form, and getting the next 10.x release out the door may take
   quite a while if it ever happens.

4) Move the build setup for BIND 9.21.x to e.g. pkgsrc-wip and
   eventually to pkgsrc proper where local patches can be
   applied, effectuating e.g. #2b above, and indicate that's
   where the NetBSD build setup for BIND 9.21.x is to be
   maintained.

Help with #2 would be appreciated, but as you see, there are
other options.

Regards,

- Håvard