linux-kernel - [PATCH] Fix libclang version check for out-of-tree builds

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Date:   Sat, 13 May 2023 14:32:37 -0500
From:   "Ethan D. Twardy" <ethan.twardy@...il.com>
To:     Miguel Ojeda <ojeda@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        Benno Lossin <benno.lossin@...ton.me>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>,
        rust-for-linux@...r.kernel.org (open list:RUST),
        linux-kernel@...r.kernel.org (open list),
        llvm@...ts.linux.dev (open list:CLANG/LLVM BUILD SUPPORT)
Cc:     "Ethan D. Twardy" <ethan.twardy@...il.com>
Subject: [PATCH] Fix libclang version check for out-of-tree builds

During out-of-tree builds where the path to the kernel source tree
contains a version string, scripts/rust_is_available.sh incorrectly
parses the version string of libclang, resulting in
CONFIG_RUST_IS_AVAILABLE erroneously set to 'n'.

To reproduce:

    $ cd ~/build && make -C ~/linux-6.4.0-rc1 O=$PWD rustavailable

Signed-off-by: Ethan D. Twardy <ethan.twardy@...il.com>
---
 scripts/rust_is_available.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/scripts/rust_is_available.sh b/scripts/rust_is_available.sh
index aebbf1913970..e8a1439be9f8 100755
--- a/scripts/rust_is_available.sh
+++ b/scripts/rust_is_available.sh
@@ -102,8 +102,8 @@ fi
 # Check that the `libclang` used by the Rust bindings generator is suitable.
 bindgen_libclang_version=$( \
 	LC_ALL=C "$BINDGEN" $(dirname $0)/rust_is_available_bindgen_libclang.h 2>&1 >/dev/null \
-		| grep -F 'clang version ' \
-		| grep -oE '[0-9]+\.[0-9]+\.[0-9]+' \
+		| grep -oE 'clang version [0-9]+\.[0-9]+\.[0-9]+' \
+		| cut -d' ' -f3 \
 		| head -n 1 \
 )
 bindgen_libclang_min_version=$($min_tool_version llvm)

base-commit: ac9a78681b921877518763ba0e89202254349d1b
-- 
2.40.1