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SubjectRe: [PATCH 15/19] Kbuild: add Rust support
On Tue, Dec 7, 2021 at 2:45 PM Nick Desaulniers <ndesaulniers@google.com> wrote:
>
> On Mon, Dec 6, 2021 at 6:07 AM Miguel Ojeda <ojeda@kernel.org> wrote:
> >
>
> ... snip ...
>
> Miguel and team,
> I'm happy to see progress here! Just some quick notes after a first pass.
>
> Testing this series applied on mainline, I see:
> $ make LLVM=1 -j72 defconfig
> $ grep RUST .config
> CONFIG_HAS_RUST=y
> CONFIG_RUSTC_VERSION=14000
> # CONFIG_RUST is not set
> ...
> $ make LLVM=1 -j72 menuconfig
> # enable CONFIG_RUST
> $ make LLVM=1
> ...
> CALL scripts/checksyscalls.sh
> error: @path is unstable - use -Z unstable-options to enable its use
>
> error: @path is unstable - use -Z unstable-options to enable its use
> $ rustc --version
> rustc 1.40.0 (73528e339 2019-12-16)
>
> Can we update some Kconfig checks to fix that?

After now reading though the Documentation/ patch:

$ rustup update
$ rustc --version
rustc 1.57.0 (f1edd0429 2021-11-29)
$ make LLVM=1 -j72
...
make[1]: *** No rule to make target
'/usr/local/google/home/ndesaulniers/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/lib.rs',
needed by 'rust/core.o'. Stop.

Maybe I'm holding it wrong, let me reread the Documentation/ again.

I still think CONFIG_RUST shouldn't be selectable unless
CONFIG_RUSTC_VERSION is either a blessed version, or above some
minimal value (like we do for CONFIG_GCC_VERSION, CONFIG_LD_VERSION,
CONFIG_CLANG_VERSION, LLD_VERSION, etc).

Also, it looks like I don't have bindgen installed. Anything we can do
there to help the developer out, as in informing them that it's
necessary perhaps via a Kconfig check? I don't think I should be able
to select CONFIG_RUST if I don't have bindgen installed. (Same comment
about version check probably applies, too). Installing bindgen
doesn't change the error I'm observing above though.
--
Thanks,
~Nick Desaulniers

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