Re: [PATCH 5/6] kbuild: rust_is_available: fix confusion when a version appears in the path

Masahiro Yamada
2023-01-12T05:32:47Z

On Tue, Jan 10, 2023 at 5:46 AM Miguel Ojeda <ojeda@kernel.org> wrote:
>
> `bindgen`'s output for `libclang`'s version check contains paths, which
> in turn may contain strings that look like version numbers [1]:
>
> .../6.1.0-dev/.../rust_is_available_bindgen_libclang.h:2:9: warning: clang version 11.1.0 [-W#pragma-messages], err: false
>
> which the script will pick up as the version instead of the latter.
>
> It is also the case that versions may appear after the actual version
> (e.g. distribution's version text), which was the reason behind `head` [2]:
>
> .../rust-is-available-bindgen-libclang.h:2:9: warning: clang version 13.0.0 (Fedora 13.0.0-3.fc35) [-W#pragma-messages], err: false
>
> Thus instead ask for a match after the `clang version` string.
>
> Reported-by: Jordan (@jordanisaacs)
> Link: https://github.com/Rust-for-Linux/linux/issues/942 [1]
> Link: https://github.com/Rust-for-Linux/linux/pull/789 [2]
> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
> ---
> scripts/rust_is_available.sh | 4 +---
> 1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/scripts/rust_is_available.sh b/scripts/rust_is_available.sh
> index 0c082a248f15..a86659410e48 100755
> --- a/scripts/rust_is_available.sh
> +++ b/scripts/rust_is_available.sh
> @@ -141,9 +141,7 @@ fi
> # of the `libclang` found by the Rust bindings generator is suitable.
> bindgen_libclang_version=$( \
> echo "$bindgen_libclang_output" \
> - | grep -F 'clang version ' \
> - | grep -oE '[0-9]+\.[0-9]+\.[0-9]+' \
> - | head -n 1 \
> + | sed -nE 's:.*clang version ([0-9]+\.[0-9]+\.[0-9]+).*:\1:p'
> )
> bindgen_libclang_min_version=$($min_tool_version llvm)
> bindgen_libclang_cversion=$(get_canonical_version $bindgen_libclang_version)
> --
> 2.39.0
>

You do not need to fork sed.

diff --git a/scripts/rust_is_available.sh b/scripts/rust_is_available.sh
index 1f478d7e0f77..ebe427e27379 100755
--- a/scripts/rust_is_available.sh
+++ b/scripts/rust_is_available.sh
@@ -137,14 +137,9 @@ fi

# `bindgen` returned successfully, thus use the output to check that
the version
# of the `libclang` found by the Rust bindings generator is suitable.
-bindgen_libclang_version=$( \
- echo "$bindgen_libclang_output" \
- | grep -F 'clang version ' \
- | grep -oE '[0-9]+\.[0-9]+\.[0-9]+' \
- | head -n 1 \
-)
+set -- ${bindgen_libclang_output#**clang version}
+bindgen_libclang_cversion=$(get_canonical_version $1)
bindgen_libclang_min_version=$($min_tool_version llvm)
-bindgen_libclang_cversion=$(get_canonical_version $bindgen_libclang_version)
bindgen_libclang_min_cversion=$(get_canonical_version
$bindgen_libclang_min_version)
if [ "$bindgen_libclang_cversion" -lt "$bindgen_libclang_min_cversion" ]; then
echo >&2 "***"

--
Best Regards
Masahiro Yamada