Re: [PATCH 00/13] Support several Rust toolchain versions

[Andreas Hindborg <nmi@metaspace.dk>]

Hi Miguel,

Miguel Ojeda <ojeda@kernel.org> writes:

> Hi all,
>
> It is time to start supporting several Rust toolchain versions and thus
> establish a minimum Rust compiler and `bindgen` version.
>
> For the Rust compiler, we will start with a window of two stable
> releases, and widen it over time. This series keeps the minimum where
> it is (1.78.0), but adds support for the recently released 1.79.0.
>
> This should already be enough for kernel developers in distributions that
> provide recent Rust compiler versions routinely, such as Arch Linux,
> Debian Unstable (outside the freeze period), Fedora Linux, Gentoo
> Linux (especially the testing channel), Nix (unstable) and openSUSE
> Tumbleweed. A documentation adds the instructions for each of them.
>
> In addition, Rust for Linux is now being built-tested in Rust's
> pre-merge CI. That is, every change that is attempting to land into the
> Rust compiler is tested against the kernel, and it is merged only if it
> passes -- thanks to the Rust project for that!
>
> Thus, with the pre-merge CI in place, both projects hope to avoid
> unintentional changes to Rust that break the kernel. This means that,
> in general, apart from intentional changes on their side (that we will
> need to workaround conditionally on our side), the upcoming Rust compiler
> versions should generally work.
>
> For instance, currently, the beta (1.80.0) and nightly (1.81.0) branches
> work as well.
>
> Similarly, we kept the minimum as it is for `bindgen`. `bindgen` is also
> adding the kernel to its CI -- thanks!
>
> Cheers,
> Miguel
>

Applied the series to [1], based on v6.9:

rustup override set --path ../rnull-v6.9-build 1.76.0
make O=../rnull-v6.9-build LLVM=1

Builds fine.

rustup override set --path ../rnull-v6.9-build 1.79.0
make O=../rnull-v6.9-build LLVM=1

make[1]: Entering directory '/home/aeh/src/linux-rust/rnull-v6.9-build'
  GEN     Makefile
mkdir -p /home/aeh/src/linux-rust/rnull-v6.9-build/tools/objtool && make O=/home/aeh/src/linux-rust/rnull-v6.9-build subdir=tools/objtool --no-print-directory -C objtool
  CALL    /home/aeh/src/linux-rust/rnull-v6.9/scripts/checksyscalls.sh
  INSTALL libsubcmd_headers
  RUSTC L rust/core.o
error: data-layout for target `target-12379853866016577623`, `e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128`, differs from LLVM target's `x86_64-linux-gnu` default layout, `e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128`

error: aborting due to 1 previous error

make[3]: *** [/home/aeh/src/linux-rust/rnull-v6.9/rust/Makefile:461: rust/core.o] Error 1
make[2]: *** [/home/aeh/src/linux-rust/rnull-v6.9/Makefile:1206: prepare] Error 2
make[1]: *** [/home/aeh/src/linux-rust/rnull-v6.9/Makefile:240: __sub-make] Error 2
make[1]: Leaving directory '/home/aeh/src/linux-rust/rnull-v6.9-build'
make: *** [Makefile:240: __sub-make] Error 2
error: Recipe `lo` failed with exit code 2


rm ../rnull-v6.9-build/rust
make O=../rnull-v6.9-build LLVM=1

same result.

rm ../rnull-v6.9-build/rust
<configure>
make O=../rnull-v6.9-build LLVM=1

same result.

Maybe because I am on v6.9?


Best regards,
Andreas


[1] https://github.com/metaspace/linux/tree/rnull-v6.9