Re: [Buildroot] [PATCH v8 1/1] package/go: use host compiler when go-bootstrap unsupported

["Yann E. MORIN" <yann.morin.1998@free.fr>]

Christian, All,

On 2024-08-19 14:34 -0700, Christian Stewart spake thusly:
> On Mon, Aug 19, 2024 at 2:17 PM Yann E. MORIN <yann.morin.1998@free.fr> wrote:
> > > Recent changes added go-src with the intent of adding go-bin later. This
> > > commit changes go-src to depend on the host Go compiler to bootstrap
> > > go-src on architectures that cannot build go-bootstrap-stage1 (such as arm64).
> > >
> > > Signed-off-by: Christian Stewart <christian@aperture.us>
> >
> > Thanks for this new iteration. But I'd rather first have the support for
> > host-go-bin, rather than rely on the system go.
> >
> > Indeed, usng host-go-bin would not require the user to install go on
> > their system; host-go-bin can be used on oder distributions where a go
> > compiler is not available, or where the go compiler is too old to build
> > go-src.
> >
> > So, I am not convinced about this "use the system go" solution.
> 
> These are two different use cases.
> 
> What you are describing is downloading and using the pre-built Go for
> everything.
> 
> What this patch accomplishes is bootstrapping host-go-src using the
> system Go compiler.
> 
> Both can be supported, this patch fixes when we select host-go-src on
> an arm64 machine.

Sorry, I was not clear enough, my bad.

So, to make it clear and explicit, here is what I think we should
support:

  - full bootstrap chain up to host-go-src, at least where possible
  - last-stage bootstrap with host-go-bootstrap-stage3-bin and host-go-src
  - host-go-bin

As far as I can see, there are binary releases for all meaningful
architectures:
    https://go.dev/dl/

  * go 1.19.13 (our stage-2 bootstrap) has:
      - go1.19.13.linux-386.tar.gz
      - go1.19.13.linux-amd64.tar.gz
      - go1.19.13.linux-arm64.tar.gz
      - go1.19.13.linux-armv6l.tar.gz
      - go1.19.13.linux-ppc64le.tar.gz
      - go1.19.13.linux-s390x.tar.gz

  * go 1.21.8 (our stage-3 bootstrap) has:
      - go1.21.8.linux-386.tar.gz
      - go1.21.8.linux-amd64.tar.gz
      - go1.21.8.linux-arm64.tar.gz
      - go1.21.8.linux-armv6l.tar.gz
      - go1.21.8.linux-loong64.tar.gz
      - go1.21.8.linux-mips.tar.gz
      - go1.21.8.linux-mips64.tar.gz
      - go1.21.8.linux-mips64le.tar.gz
      - go1.21.8.linux-mipsle.tar.gz
      - go1.21.8.linux-ppc64.tar.gz
      - go1.21.8.linux-ppc64le.tar.gz
      - go1.21.8.linux-riscv64.tar.gz
      - go1.21.8.linux-s390x.tar.gz

So if we introduce host-go-bootstrap-stage3-bin with go 1.21.8, we
basically get support for all architectures (and more) where we
expect Buildroot to run (to run, not to generate code for!). Maybe one
could argue that riscv32 is missing, but I doubt anyone has a riscv32
machine powerful enough to run Buildroot on (riscv64 sure, riscv32 much
less), so that is not a concern either (IMHO).

This would also fix the issue you are reporting of running Buildroot on
an AArch64 (aka arm64) machine.

> This is no different from using the host gcc to bootstrap the
> Buildroot gcc, no?

As I explained previously, the suggestion above would allow having a
"final" go compiler everywhere, even for those distributions where
there is none, or where it is too old, for which your proposal does not
work.

Currently, the oldest gcc supported to build gcc 14.x, is gcc 4.8.3 [0]
released 2014-05-22, just ten years ago, so virtually all distributions
that make sense today have such a gcc or more recent, so the bootstrap
case is not really an issue, and a C compiler really is a basic tool we
can expect everywhere, while a go compiler is definitely not a basic
tool we can expect or rely on.

[0] https://gcc.gnu.org/install/prerequisites.html

Regards,
Yann E. MORIN.

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