On Sat, Jul 26, 2025 at 9:35 AM Miguel Ojeda ojeda@kernel.org wrote:

`rustdoc` can get confused when generating documentation into a folder that contains generated files from other `rustdoc` versions.

For instance, running something like:

rustup default 1.78.0
make LLVM=1 rustdoc
rustup default 1.88.0
make LLVM=1 rustdoc

may generate errors like:

error: couldn't generate documentation: invalid template: last line expected to start with a comment
  |
  = note: failed to create or modify "./Documentation/output/rust/rustdoc/src-files.js"

Thus just always clean the output folder before generating the documentation -- we are anyway regenerating it every time the `rustdoc` target gets called, at least for the time being.

Cc: stable@vger.kernel.org # Needed in 6.12.y and later (Rust is pinned in older LTSs). Reported-by: Daniel Almeida daniel.almeida@collabora.com Closes: https://rust-for-linux.zulipchat.com/#narrow/channel/288089/topic/x/near/527... Signed-off-by: Miguel Ojeda ojeda@kernel.org

I've seen this as well.

Reviewed-by: Tamir Duberstein tamird@kernel.org

---

rust/Makefile | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/rust/Makefile b/rust/Makefile index 115b63b7d1e3..771246bc7ae6 100644 --- a/rust/Makefile +++ b/rust/Makefile @@ -103,14 +103,14 @@ rustdoc: rustdoc-core rustdoc-macros rustdoc-compiler_builtins \ rustdoc-macros: private rustdoc_host = yes rustdoc-macros: private rustc_target_flags = --crate-type proc-macro \ --extern proc_macro -rustdoc-macros: $(src)/macros/lib.rs FORCE +rustdoc-macros: $(src)/macros/lib.rs rustdoc-clean FORCE +$(call if_changed,rustdoc)

# Starting with Rust 1.82.0, skipping `-Wrustdoc::unescaped_backticks` should # not be needed -- see https://github.com/rust-lang/rust/pull/128307. rustdoc-core: private skip_flags = --edition=2021 -Wrustdoc::unescaped_backticks rustdoc-core: private rustc_target_flags = --edition=$(core-edition) $(core-cfgs) -rustdoc-core: $(RUST_LIB_SRC)/core/src/lib.rs FORCE +rustdoc-core: $(RUST_LIB_SRC)/core/src/lib.rs rustdoc-clean FORCE +$(call if_changed,rustdoc)

rustdoc-compiler_builtins: $(src)/compiler_builtins.rs rustdoc-core FORCE @@ -122,7 +122,8 @@ rustdoc-ffi: $(src)/ffi.rs rustdoc-core FORCE rustdoc-pin_init_internal: private rustdoc_host = yes rustdoc-pin_init_internal: private rustc_target_flags = --cfg kernel \ --extern proc_macro --crate-type proc-macro -rustdoc-pin_init_internal: $(src)/pin-init/internal/src/lib.rs FORCE +rustdoc-pin_init_internal: $(src)/pin-init/internal/src/lib.rs \

• rustdoc-clean FORCE +$(call if_changed,rustdoc)

rustdoc-pin_init: private rustdoc_host = yes @@ -140,6 +141,9 @@ rustdoc-kernel: $(src)/kernel/lib.rs rustdoc-core rustdoc-ffi rustdoc-macros \ $(obj)/bindings.o FORCE +$(call if_changed,rustdoc)

+rustdoc-clean: FORCE

•   $(Q)rm -rf $(rustdoc_output)
  

quiet_cmd_rustc_test_library = $(RUSTC_OR_CLIPPY_QUIET) TL $< cmd_rustc_test_library = \ OBJTREE=$(abspath $(objtree)) \

base-commit: 89be9a83ccf1f88522317ce02f854f30d6115c41

2.50.1