On Mon, Nov 10, 2025 at 2:19 PM Miguel Ojeda <[email protected]> wrote: > > From: Sami Tolvanen <[email protected]> > > Starting with Rust 1.91.0 (released 2025-10-30), in upstream commit > ab91a63d403b ("Ignore intrinsic calls in cross-crate-inlining cost model") > [1][2], `bindings.o` stops containing DWARF debug information because the > `Default` implementations contained `write_bytes()` calls which are now > ignored in that cost model (note that `CLIPPY=1` does not reproduce it). > > This means `gendwarfksyms` complains: > > RUSTC L rust/bindings.o > error: gendwarfksyms: process_module: dwarf_get_units failed: no > debugging information? > > There are several alternatives that would work here: conditionally > skipping in the cases needed (but that is subtle and brittle), forcing > DWARF generation with e.g. a dummy `static` (ugly and we may need to > do it in several crates), skipping the call to the tool in the Kbuild > command when there are no exports (fine) or teaching the tool to do so > itself (simple and clean). > > Thus do the last one: don't attempt to process files if we have no symbol > versions to calculate. > > [ I used the commit log of my patch linked below since it explained the > root issue and expanded it a bit more to summarize the alternatives. > > - Miguel ] > > Cc: [email protected] # Needed in 6.12.y and later (Rust is pinned in > older LTSs). > Reported-by: Haiyue Wang <[email protected]> > Closes: > https://lore.kernel.org/rust-for-linux/[email protected]/ > Suggested-by: Miguel Ojeda <[email protected]> > Link: > https://lore.kernel.org/rust-for-linux/CANiq72nKC5r24VHAp9oUPR1HVPqT+=0ab9n0w6gqtf-kjoe...@mail.gmail.com/ > Link: > https://github.com/rust-lang/rust/commit/ab91a63d403b0105cacd72809cd292a72984ed99 > [1] > Link: https://github.com/rust-lang/rust/pull/145910 [2] > Signed-off-by: Sami Tolvanen <[email protected]> > Signed-off-by: Miguel Ojeda <[email protected]>
Applied to `rust-fixes` to start getting some testing. If someone doesn't want it, then please let me know. Cheers, Miguel
