On Tue, Oct 8, 2024 at 7:32 PM Alice Ryhl <aliceryhl@xxxxxxxxxx> wrote: > > Fix a few different compiler errors that cause rustc-option to give > wrong results. > > If KBUILD_RUSTFLAGS or the flags being tested contain any -Z flags, then > the error below is generated. The RUSTC_BOOTSTRAP environment variable > is added to fix this error. > > error: the option `Z` is only accepted on the nightly compiler > help: consider switching to a nightly toolchain: `rustup default nightly` > note: selecting a toolchain with `+toolchain` arguments require a rustup proxy; > see <https://rust-lang.github.io/rustup/concepts/index.html> > note: for more information about Rust's stability policy, see > <https://doc.rust-lang.org/book/appendix-07-nightly-rust.html#unstable-features> > error: 1 nightly option were parsed > > The probe may also fail incorrectly with the below error message. To fix > it, the /dev/null argument is replaced with a new rust/probe.rs file > that doesn't need even the core part of the standard library. > > error[E0463]: can't find crate for `std` > | > = note: the `aarch64-unknown-none` target may not be installed > = help: consider downloading the target with `rustup target add aarch64-unknown-none` > = help: consider building the standard library from source with `cargo build -Zbuild-std` > > The -o and --out-dir parameters are altered to fix this warning: > > warning: ignoring --out-dir flag due to -o flag > > I verified that the Kconfig version of rustc-option doesn't have the > same issues. > > Fixes: c42297438aee ("kbuild: rust: Define probing macros for rustc") > Signed-off-by: Alice Ryhl <aliceryhl@xxxxxxxxxx> > --- > Changes in v2: > - Add `export` to RUSTC_BOOTSTRAP. > - Fix error about core being missing. > - Fix warning about -o flag. > - Link to v1: https://lore.kernel.org/r/20241008-rustc-option-bootstrap-v1-1-9eb06261d4f7@xxxxxxxxxx v3 sent here: https://lore.kernel.org/all/20241009-rustc-option-bootstrap-v3-1-5fa0d520efba@xxxxxxxxxx/ Alice
