Re: [PATCH v2] Kbuild: fix issues with rustc-option

[Alice Ryhl <aliceryhl@google.com>]

On Wed, Oct 9, 2024 at 12:32 PM Masahiro Yamada <masahiroy@kernel.org> wrote:
>
> On Wed, Oct 9, 2024 at 4:42 AM Alice Ryhl <aliceryhl@google.com> wrote:
> >
> > On Tue, Oct 8, 2024 at 9:00 PM Masahiro Yamada <masahiroy@kernel.org> wrote:
> > >
> > > On Wed, Oct 9, 2024 at 2:32 AM Alice Ryhl <aliceryhl@google.com> wrote:
> > > > diff --git a/scripts/Makefile.compiler b/scripts/Makefile.compiler
> > > > index 057305eae85c..08d5b7177ea8 100644
> > > > --- a/scripts/Makefile.compiler
> > > > +++ b/scripts/Makefile.compiler
> > > > @@ -21,6 +21,7 @@ TMPOUT = $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_$$$$
> > > >  # automatically cleaned up.
> > > >  try-run = $(shell set -e;              \
> > > >         TMP=$(TMPOUT)/tmp;              \
> > > > +       export RUSTC_BOOTSTRAP=1;       \
> > >
> > >
> > > try-run is not Rust-specific.
> > >
> > > Is there any reason why you did not add it
> > > to __rustc-option?
> > >
> > >
> > > __rustc-option = $(call try-run,\
> > >        RUSTC_BOOTSTRAP=1 $(1) $(2) $(3) --crate-type=rlib
> > > $(srctree)/rust/probe.rs --out-dir=$$TMP,$(3),$(4))
> >
> > I had an explanation for this in the commit message, but it looks like
> > it got lost when I rewrote it for v2. Anyway, the reason is that I'd
> > have to modify both __rustc-option and rustc-option-yn to do that, and
> > putting it here seemed more future-proof against making the same
> > mistake in any rustc-* commands added in the future.
>
>
> One solution is to delete rustc-option-yn since there are no users of it.
>
> Another solution is to refactor the code.
>
> Either way, there is no good reason for code duplication.
>
>
> If you keep rustc-option-yn, you can rebased v3 on top of this patch:
> https://lore.kernel.org/lkml/20241009102821.2675718-1-masahiroy@kernel.org/T/#u

I'll rebase on top of that. If we choose to delete rustc-option-yn
then I think we should first merge the refactor and then delete it in
a follow-up. That way, when someone does need it, they will find the
refactored implementation in the git history.

Alice