linux-kernel - [PATCH v2 08/13] rust: work around `bindgen` 0.69.0 issue

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Message-ID: <20240709160615.998336-9-ojeda@kernel.org>
Date: Tue,  9 Jul 2024 18:06:03 +0200
From: Miguel Ojeda <ojeda@...nel.org>
To: Miguel Ojeda <ojeda@...nel.org>,
	Wedson Almeida Filho <wedsonaf@...il.com>,
	Alex Gaynor <alex.gaynor@...il.com>
Cc: Boqun Feng <boqun.feng@...il.com>,
	Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <benno.lossin@...ton.me>,
	Andreas Hindborg <a.hindborg@...sung.com>,
	Alice Ryhl <aliceryhl@...gle.com>,
	rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	patches@...ts.linux.dev,
	Finn Behrens <me@...enk.dev>
Subject: [PATCH v2 08/13] rust: work around `bindgen` 0.69.0 issue

`bindgen` 0.69.0 contains a bug: `--version` does not work without
providing a header [1]:

    error: the following required arguments were not provided:
      <HEADER>

    Usage: bindgen <FLAGS> <OPTIONS> <HEADER> -- <CLANG_ARGS>...

Thus, in preparation for supporting several `bindgen` versions, work
around the issue by passing a dummy argument.

Include a comment so that we can remove the workaround in the future.

Link: https://github.com/rust-lang/rust-bindgen/pull/2678 [1]
Reviewed-by: Finn Behrens <me@...enk.dev>
Tested-by: Benno Lossin <benno.lossin@...ton.me>
Tested-by: Andreas Hindborg <a.hindborg@...sung.com>
Signed-off-by: Miguel Ojeda <ojeda@...nel.org>
---
 init/Kconfig                 | 5 ++++-
 scripts/rust_is_available.sh | 6 +++++-
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/init/Kconfig b/init/Kconfig
index febdea2afc3b..94e20d3b99d4 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1928,7 +1928,10 @@ config RUSTC_VERSION_TEXT
 config BINDGEN_VERSION_TEXT
 	string
 	depends on RUST
-	default $(shell,command -v $(BINDGEN) >/dev/null 2>&1 && $(BINDGEN) --version || echo n)
+	# The dummy parameter `workaround-for-0.69.0` is required to support 0.69.0
+	# (https://github.com/rust-lang/rust-bindgen/pull/2678). It can be removed when
+	# the minimum version is upgraded past that (0.69.1 already fixed the issue).
+	default $(shell,command -v $(BINDGEN) >/dev/null 2>&1 && $(BINDGEN) --version workaround-for-0.69.0 || echo n)
 
 #
 # Place an empty function call at each tracepoint site. Can be
diff --git a/scripts/rust_is_available.sh b/scripts/rust_is_available.sh
index 67cb900124cc..1881e8f2a2b9 100755
--- a/scripts/rust_is_available.sh
+++ b/scripts/rust_is_available.sh
@@ -121,8 +121,12 @@ fi
 # Check that the Rust bindings generator is suitable.
 #
 # Non-stable and distributions' versions may have a version suffix, e.g. `-dev`.
+#
+# The dummy parameter `workaround-for-0.69.0` is required to support 0.69.0
+# (https://github.com/rust-lang/rust-bindgen/pull/2678). It can be removed when
+# the minimum version is upgraded past that (0.69.1 already fixed the issue).
 rust_bindings_generator_output=$( \
-	LC_ALL=C "$BINDGEN" --version 2>/dev/null
+	LC_ALL=C "$BINDGEN" --version workaround-for-0.69.0 2>/dev/null
 ) || rust_bindings_generator_code=$?
 if [ -n "$rust_bindings_generator_code" ]; then
 	echo >&2 "***"
-- 
2.45.2