After [1] in upstream LLVM, ld.lld's version output became slightly
different when the cmake configuration option LLVM_APPEND_VC_REV is
disabled.
Before:
Debian LLD 19.0.0 (compatible with GNU linkers)
After:
Debian LLD 19.0.0, compatible with GNU linkers
This results in ld-version.sh failing with
scripts/ld-version.sh: 18: arithmetic expression: expecting EOF: "10000 * 19 + 100 * 0 + 0,"
because the trailing comma is included in the patch level part of the
expression. While [1] has been partially reverted in [2] to avoid this
breakage (as it impacts the configuration stage and it is present in all
LTS branches), it would be good to make ld-version.sh more robust
against such miniscule changes like this one.
Use POSIX shell parameter expansion [3] to remove the largest suffix
after just numbers and periods, replacing of the current removal of
everything after a hyphen. ld-version.sh continues to work for a number
of distributions (Arch Linux, Debian, and Fedora) and the kernel.org
toolchains and no longer errors on a version of ld.lld with [1].
Fixes: 02aff8592204 ("kbuild: check the minimum linker version in Kconfig")
Link: https://github.com/llvm/llvm-project/commit/0f9fbbb63cfcd2069441aa2ebef622c9716f8dbb [1]
Link: https://github.com/llvm/llvm-project/commit/649cdfc4b6781a350dfc87d9b2a4b5a4c3395909 [2]
Link: https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html [3]
Suggested-by: Fangrui Song <maskray@xxxxxxxxxx>
Reviewed-by: Fangrui Song <maskray@xxxxxxxxxx>
Signed-off-by: Nathan Chancellor <nathan@xxxxxxxxxx>
---
Changes in v2:
- Move to a pattern matching notation with remove largest suffix to
remove everything after just numbers and periods.
- The LLVM change that prompted this has been partially reverted to
avoid this problem, so reword commit message to reflect this is being
done defensively. As such, remove 'Cc: stable@xxxxxxxxxxxxxxx'. If it
is needed there at some point, it can just be manually backported (or
it will just get AUTOSEL'd).
- Add tags for Fangrui's suggestion and review on v1.
- Link to v1: https://lore.kernel.org/r/20240704-update-ld-version-for-new-lld-ver-str-v1-1-91bccc020a93@xxxxxxxxxx
---
scripts/ld-version.sh | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/scripts/ld-version.sh b/scripts/ld-version.sh
index a78b804b680c..b9513d224476 100755
--- a/scripts/ld-version.sh
+++ b/scripts/ld-version.sh
@@ -57,9 +57,11 @@ else
fi
fi
-# Some distributions append a package release number, as in 2.34-4.fc32
-# Trim the hyphen and any characters that follow.
-version=${version%-*}
+# There may be something after the version, such as a distribution's package
+# release number (like Fedora's "2.34-4.fc32") or punctuation (like LLD briefly
+# added before the "compatible with GNU linkers" string), so remove everything
+# after just numbers and periods.
+version=${version%%[!0-9.]*}
cversion=$(get_canonical_version $version)
min_cversion=$(get_canonical_version $min_version)
---
base-commit: 22a40d14b572deb80c0648557f4bd502d7e83826
change-id: 20240704-update-ld-version-for-new-lld-ver-str-b7a4afbbd5f1
Best regards,
--
Nathan Chancellor <nathan@xxxxxxxxxx>
