WIP: test Rust for Linux in PR CI

src/ci/docker/host-x86_64/rfl/Dockerfile

@@ -0,0 +1,50 @@
+FROM ubuntu:23.10
+
+ARG DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+  g++ \
+  gcc-multilib \
+  make \
+  ninja-build \
+  file \
+  curl \
+  ca-certificates \
+  python3 \
+  git \
+  cmake \
+  sudo \
+  gdb \
+  flex \
+  bison \
+  bc \
+  llvm-17-tools \
+  llvm-17-dev \
+  libedit-dev \
+  libssl-dev \
+  pkg-config \
+  zlib1g-dev \
+  xz-utils \
+  && rm -rf /var/lib/apt/lists/*
+
+COPY scripts/sccache.sh /scripts/
+RUN sh /scripts/sccache.sh
+
+# We are disabling CI LLVM since this builder is intentionally using a host
+# LLVM, rather than the typical src/llvm-project LLVM.
+ENV NO_DOWNLOAD_CI_LLVM 1
+ENV EXTERNAL_LLVM 1
+
+# This is not the latest LLVM version, so some components required by tests may
+# be missing.
+ENV IS_NOT_LATEST_LLVM 1
+
+# Using llvm-link-shared due to libffi issues -- see #34486
+ENV RUST_CONFIGURE_ARGS \
+      --build=x86_64-unknown-linux-gnu \
+      --llvm-root=/usr/lib/llvm-17 \
+      --enable-llvm-link-shared \
+      --set rust.thin-lto-import-instr-limit=10
+
+COPY /scripts/rfl-build.sh /tmp/rfl-build.sh
+ENV SCRIPT bash /tmp/rfl-build.sh

src/ci/docker/scripts/rfl-build.sh

@@ -0,0 +1,49 @@
+#!/bin/bash
+
+set -euo pipefail
+
+LINUX_VERSION=v6.9
+
+# Build rustc
+../x.py --stage 1 build library/std
+BUILT_RUSTC=$(realpath ./build/x86_64-unknown-linux-gnu/stage1/bin/rustc)
+
+# Install rustup so that we have cargo for installing bindgen
+curl --proto '=https' --tlsv1.2 -sSf -o rustup.sh https://sh.rustup.rs
+sh rustup.sh -y --default-toolchain stable --profile minimal
+
+# Install bindgen
+"$HOME"/.cargo/bin/cargo install --locked --version $(/rfl/linux/scripts/min-tool-version.sh bindgen) bindgen-cli
+
+mkdir -p /rfl
+cd /rfl
+
+# Download Linux
+git clone --depth 1 --branch ${LINUX_VERSION} https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
+
+# Configure Linux
+cat <<EOF > linux/kernel/configs/rfl-for-rust-ci.config
+# CONFIG_RETHUNK is not set
+# CONFIG_X86_KERNEL_IBT is not set
+# CONFIG_GCC_PLUGINS is not set
+
+CONFIG_RUST=y
+
+CONFIG_SAMPLES=y
+CONFIG_SAMPLES_RUST=y
+
+CONFIG_SAMPLE_RUST_MINIMAL=m
+CONFIG_SAMPLE_RUST_PRINT=y
+
+CONFIG_RUST_PHYLIB_ABSTRACTIONS=y
+CONFIG_AX88796B_PHY=y
+CONFIG_AX88796B_RUST_PHY=y
+
+CONFIG_KUNIT=y
+CONFIG_RUST_KERNEL_DOCTESTS=y
+EOF
+
+export RUSTC=${BUILT_RUSTC}
+
+make -C linux LLVM=1 -j$(($(nproc) + 1)) rustavailable defconfig rfl-for-rust-ci.config
+make -C linux LLVM=1 -j$(($(nproc) + 1)) samples/rust/rust_minimal.o samples/rust/rust_print.o drivers/net/phy/ax88796b_rust.o

src/ci/github-actions/jobs.yml

@@ -75,17 +75,19 @@ envs:
 # These jobs automatically inherit envs.pr, to avoid repeating
 # it in each job definition.
 pr:
-  - image: mingw-check
-    <<: *job-linux-4c
-  - image: mingw-check-tidy
-    continue_on_error: true
-    <<: *job-linux-4c
-  - image: x86_64-gnu-llvm-17
-    env:
-      ENABLE_GCC_CODEGEN: "1"
-    <<: *job-linux-16c
-  - image: x86_64-gnu-tools
-    <<: *job-linux-16c
+  #  - image: mingw-check
+  #    <<: *job-linux-4c
+  #  - image: mingw-check-tidy
+  #    continue_on_error: true
+  #    <<: *job-linux-4c
+  #  - image: x86_64-gnu-llvm-17
+  #    env:
+  #      ENABLE_GCC_CODEGEN: "1"
+  #    <<: *job-linux-16c
+  #  - image: x86_64-gnu-tools
+  #    <<: *job-linux-16c
+  - image: rfl
+    <<: *job-linux-8c
 
 # Jobs that run when you perform a try build (@bors try)
 # These jobs automatically inherit envs.try, to avoid repeating