Re: cargo-c

[Greg Troxel <gdt%lexort.com@localhost>]

pin <voidpin%protonmail.com@localhost> writes:

> On Wednesday, April 16th, 2025 at 2:25 PM, Greg Troxel <gdt%lexort.com@localhost> wrote:
>
>> pin voidpin%protonmail.com@localhost writes:

>> What is the set of platforms that can run rust-1.76 and cannot (even
>> with rust-bin) run the current version (1.85.1?)?
>
> It's my understanding that cross-compiled rust-bin should work on all platforms.
> Hence my question about the update, as I no longer see a reason to hold it back.
> But, perhaps he@ can comment.
> 32bits ARM cannot natively build rust > 1.76

I just looked more, and realized this update is blcoked on changing the
code that currently selects rust 1.76 for earmv7hf.  I have in my local
tree:

  --- rust/platform.mk    8 Apr 2025 09:31:06 -0000       1.31
  +++ rust/platform.mk    16 Apr 2025 13:09:09 -0000
  @@ -16,9 +16,10 @@ RUST_PLATFORMS+=     ${rust_os}-*-${rust_arc
   .  endfor
   .endfor

  -.if ${MACHINE_PLATFORM:MNetBSD-*-earm*} && ${OPSYS_VERSION} < 100000
  -RUST_DIR?=     ../../lang/rust176
  -.endif
  +# rust-bin works on RPI3
  +#.if ${MACHINE_PLATFORM:MNetBSD-*-earm*} && ${OPSYS_VERSION} < 100000
  +#RUST_DIR?=    ../../lang/rust176
  +#.endif
   RUST_DIR?=     ../../lang/rust

   .for rust_platform in ${RUST_PLATFORMS}

We are about to say "rust (upstream) is infeasiable on earm*, so on that
platform you have to have RUST_TYPE=bin", and it remains to make that
default (on platforms that rust is too piggy for, only).

Once we set RUST_TYPE=bin, the above can just be dropped.

>> What is the minimum rust version for new cargo-c?
>
> 1.84

That's crazy, and I'm even a little surprised.  But since in pkgsrc,
either you can have 1.85.1, or you lose, I guess it doesn't actually
matter.

>> My take is that it's increasing less reasonable to hold things back for
>> netbsd-9 as it's more than 5 years old*, but that we need to have a path
>> for NetBSD 10 on earmv7hf-el with 1 GB of RAM (e.g. RPI2/3).
>
> Please see answer to the first question.

I guess we have a path, but it fails by default, and I should have said
something stronger.

Looking towards adding a conditional to set RUST_TYPE=bin:

  Does lang/rust build on any 32-bit arm?  I would think this is not
  about NetBSD.

  Does lang/rust build on i386?  Is this a 32-bit CPU problem in
  general, or is it just the arm build that is too piggy to fit in
  32-bit VA?