Greetings. Martin Steigerwald - 06.08.26, 19:07:33 CEST: > I am building my own kernel with: > > time eatmydata make LLVM=1 -j16 bindeb-pkg LOCALVERSION=-t14g5 > > I do have rustc and rust-src as of 1.95.0+dfsg1-2, bindgen as of > 0.72.1-1+b2 on Devuan Ceres which is based on Debian Unstable aka Sid. > > I am quite confident my kernel is build with rust support: > > % grep _RUST /boot/config-7.1.6-t14g5 > CONFIG_RUSTC_VERSION=109500 > CONFIG_RUST_IS_AVAILABLE=y > CONFIG_RUSTC_LLVM_VERSION=210108 > CONFIG_RUSTC_LLVM_MAJOR_VERSION=21 > CONFIG_RUSTC_CLANG_LLVM_COMPATIBLE=y > CONFIG_RUSTC_HAS_SPAN_FILE=y > CONFIG_RUSTC_HAS_UNNECESSARY_TRANSMUTES=y > CONFIG_RUSTC_HAS_FILE_WITH_NUL=y > CONFIG_RUSTC_HAS_FILE_AS_C_STR=y > CONFIG_RUST=y > CONFIG_RUSTC_VERSION_TEXT= > "rustc 1.95.0 (59807616e 2026-04-14) (built from a source tarball)" > CONFIG_HAVE_RUST=y > CONFIG_HAVE_CFI_ICALL_NORMALIZE_INTEGERS_RUSTC=y […] > CONFIG_RUST_OVERFLOW_CHECKS=y > # CONFIG_RUST_BUILD_ASSERT_ALLOW is not set > CONFIG_RUST_INLINE_HELPERS=y > > I install linux-image and linux-header packages. > > Yet with bcachefs-kernel-dkms up to 1:1.39.0 I see: > > built without Rust support; this will be required in the near future - > ensure a compatible Rust toolchain (rustc + bindgen + rust-src) is > available at module build time > > Would bcachefs-kernel-dkms use LLVM automatically? AFAIR I did not > manage to have a kernel with Rust support using GCC which I used > previously.
It does. Also rust source files are being built into object files. Also things like "rust/libcore.rmeta" are build. Yet not included into linux-headers package. So for some reason the Debian build does not include the necessary Rust files within the linux-headers. This is why Rust build is disabled during DKMS module build as indicated by "make.log": bcachefs: building without Rust — missing the kernel's prebuilt Rust stdlib (/usr/src/linux-headers-7.1.7-t14g5/rust/libcore.rmeta); the kernel was built/installed without its rust/ artifacts I leave it at that for now. Best, -- Martin
