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a=openpgp-sha256; l=3960; i=aliceryhl@google.com; h=from:subject:message-id; bh=ioyjOajrFUcSJsPSpIsZJ5SxB5UOY0I6EBrBjM/1voU=; b=owEBbQKS/ZANAwAKAQRYvu5YxjlGAcsmYgBnB6CYAC51tAnp8Qhdz59K5IFjoWW12e6tR9tLn kG/RmSvGhaJAjMEAAEKAB0WIQSDkqKUTWQHCvFIvbIEWL7uWMY5RgUCZwegmAAKCRAEWL7uWMY5 RgmyEACujMB3w0rEef116bx1bRT21n1YSunfGZXdQCCu2RtRyUVgsAEUwAVB5pdwVkC4eO9k2y4 J/0P5OFmndf5+KsZZT6jdQdRtUkNY8h/5fUPuTNsLQZt4LEgQ4MQyqbC6/hJWb9ZfrXZGokMuYk NPi5w6WZScxVBt9QEKvSCQ0AlJ0Q+1WvZbt3JJBKLZOhVJPlQZXik7JbThTpSdZzkVPp+MM/HKc zP6pz5u+VmWY7AqGTE/N1n2FgHIe8Ooyl9l5lWwbX0tXfmHPdAfZ6o8A0EQHT4MUHzM5263Qn9R /CoMZ61NeRmxv9nAlddUSP9xEokmrVy5CdIHQINBKsvaGjnuXrg0kpaaFWvvrXNO4zxsPaOy19M owZX8cAsQQ0wFtN3lrRuy5FkSlhWgnjPYEIbI7YW0uY005s6dhdRFXSJ665W0KcPG6Q9FKJiW7m hauSngZ5cbsX55pxwJVDXXZJ0rxbX8ySptvJeCUmoi87os8k0vy8FwUvbpdrAL2dgibjLbgRb+J kwDlcUEtlnNnltQST23BIiQm3Erw7fHHdbeC0Igr5CWNKGEIXvk36XAdt2dDb4tU4jOq0t5aCVQ mKOsr+/PeiQ9vHdAhu97yN5Jqtp85cbystbJ0XaJNX80jGj5HcMzRwB87Q4nX8NJkU98RoQbEQK HoWTPx+0j4qrp6w== X-Mailer: b4 0.13.0 Message-ID: <20241010-icall-detect-vers-v1-1-8f114956aa88@google.com> Subject: [PATCH 1/2] kbuild: rust: add `CONFIG_RUSTC_LLVM_VERSION` From: Alice Ryhl To: Masahiro Yamada , Miguel Ojeda , Sami Tolvanen , Kees Cook , Nathan Chancellor Cc: Alex Gaynor , Boqun Feng , Gary Guo , " =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= " , Benno Lossin , Andreas Hindborg , Trevor Gross , linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org, rust-for-linux@vger.kernel.org, llvm@lists.linux.dev, Alice Ryhl From: Gary Guo Each version of Rust supports a range of LLVM versions. There are cases where we want to gate a config on the LLVM version instead of the Rust version. Normalized cfi integer tags are one example [1]. For consistency with cc-version and ld-version, the new version number is added to the existing rustc-version script, rather than being added to a new script. The invocation of rustc-version is being moved from init/Kconfig to scripts/Kconfig.include to avoid invoking rustc-version.sh twice and for consistency with cc-version. Link: https://lore.kernel.org/all/20240925-cfi-norm-kasan-fix-v1-1-0328985cdf33@google.com/ [1] Signed-off-by: Gary Guo Signed-off-by: Alice Ryhl Reviewed-by: Sami Tolvanen --- init/Kconfig | 6 +++++- scripts/Kconfig.include | 4 ++++ scripts/rustc-version.sh | 31 +++++++++++++++++++++++++------ 3 files changed, 34 insertions(+), 7 deletions(-) diff --git a/init/Kconfig b/init/Kconfig index 530a382ee0fe..98cf859d58c2 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -62,7 +62,7 @@ config LLD_VERSION config RUSTC_VERSION int - default $(shell,$(srctree)/scripts/rustc-version.sh $(RUSTC)) + default $(rustc-version) help It does not depend on `RUST` since that one may need to use the version in a `depends on`. @@ -78,6 +78,10 @@ config RUST_IS_AVAILABLE In particular, the Makefile target 'rustavailable' is useful to check why the Rust toolchain is not being detected. +config RUSTC_LLVM_VERSION + int + default $(rustc-llvm-version) + config CC_CAN_LINK bool default $(success,$(srctree)/scripts/cc-can-link.sh $(CC) $(CLANG_FLAGS) $(USERCFLAGS) $(USERLDFLAGS) $(m64-flag)) if 64BIT diff --git a/scripts/Kconfig.include b/scripts/Kconfig.include index 785a491e5996..788097a55731 100644 --- a/scripts/Kconfig.include +++ b/scripts/Kconfig.include @@ -65,6 +65,10 @@ cc-option-bit = $(if-success,$(CC) -Werror $(1) -E -x c /dev/null -o /dev/null,$ m32-flag := $(cc-option-bit,-m32) m64-flag := $(cc-option-bit,-m64) +rustc-info := $(shell,$(srctree)/scripts/rustc-version.sh $(RUSTC)) +rustc-version := $(shell,set -- $(rustc-info) && echo $1) +rustc-llvm-version := $(shell,set -- $(rustc-info) && echo $2) + # $(rustc-option,) # Return y if the Rust compiler supports , n otherwise # Calls to this should be guarded so that they are not evaluated if diff --git a/scripts/rustc-version.sh b/scripts/rustc-version.sh index 4e22593e2eab..24e19ed8f234 100755 --- a/scripts/rustc-version.sh +++ b/scripts/rustc-version.sh @@ -3,14 +3,23 @@ # # Usage: $ ./rustc-version.sh rustc # -# Print the Rust compiler version in a 6 or 7-digit form. +# Print the Rust compiler version and the LLVM version it uses in a 6 or +# 7-digit form. + +# Convert the version string x.y.z to a canonical up-to-6-digits form. +get_llvm_canonical_version() +{ + IFS=. + set -- $1 + echo $((10000 * $1 + 100 * $2 + $3)) +} # Convert the version string x.y.z to a canonical up-to-7-digits form. # -# Note that this function uses one more digit (compared to other -# instances in other version scripts) to give a bit more space to +# Note that this function uses one more digit (compared to other instances in +# other version scripts and the instance above) to give a bit more space to # `rustc` since it will reach 1.100.0 in late 2026. -get_canonical_version() +get_rustc_canonical_version() { IFS=. set -- $1 @@ -19,8 +28,18 @@ get_canonical_version() if output=$("$@" --version 2>/dev/null); then set -- $output - get_canonical_version $2 + rustc_version=$(get_rustc_canonical_version $2) else - echo 0 + echo 0 0 exit 1 fi + +if output=$("$@" --version --verbose 2>/dev/null | grep LLVM); then + set -- $output + rustc_llvm_version=$(get_llvm_canonical_version $3) +else + echo 0 0 + exit 1 +fi + +echo $rustc_version $rustc_llvm_version