Re: [PATCH] libxl: avoid golang building without CONFIG_GOLANG=y

[Wei Liu <wl@xen.org>]

On Tue, Aug 04, 2020 at 05:30:40PM +0200, Jan Beulich wrote:
> On 04.08.2020 17:22, Nick Rosbrook wrote:
> > On Tue, Aug 4, 2020 at 10:17 AM Wei Liu <wl@xen.org> wrote:
> >>
> >> On Mon, Aug 03, 2020 at 10:06:32AM +0200, Jan Beulich wrote:
> >>> While this doesn't address the real problem I've run into (attempting to
> >>> update r/o source files), not recursing into tools/golang/xenlight/ is
> >>> enough to fix the build for me for the moment. I don't currently see why
> >>> 60db5da62ac0 ("libxl: Generate golang bindings in libxl Makefile") found
> >>> it necessary to invoke this build step unconditionally.
> >>>
> >>
> >> Perhaps an oversight?
> > 
> > This is intentional, and I think the commit message in 60db5da62ac0
> > ("libxl: Generate golang bindings in libxl Makefile") explains the
> > reasoning well. But, to summarize, CONFIG_GOLANG is only used to
> > control the bindings actually being compiled (i.e. with `go build`).
> > However, we always want the code generation script
> > (tools/golang/xenlight/gengotypes.py) to run if e.g.
> > tools/libxl/libxl_types.idl is modified.
> > 
> > I hope this helps.
> 
> Not really - I'm still not seeing the "why" behind this behavior. I.e.
> why build _anything_ that's not used further in the build, nor getting
> installed? Also if (aiui) you effectively object to the change that
> Wei has given his ack for, would you mind providing an alternative fix
> for the problem at hand?

Is the solution here to make the target check if IDL definition file is
actually changed before regenerating the bindings?

Admittedly I had misunderstood what CONFIG_GOLANG meant.

Wei.

> 
> Jan