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kbuild: Make ld-version.sh more robust against version string changes

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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: 0f9fbbb63c [1]
Link: 649cdfc4b6 [2]
Link: https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html [3]
Suggested-by: Fangrui Song <maskray@google.com>
Reviewed-by: Fangrui Song <maskray@google.com>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Nathan Chancellor 2024-07-07 22:06:47 -07:00 committed by Masahiro Yamada
parent 22a40d14b5
commit 9852f47ac7
1 changed files with 5 additions and 3 deletions
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8
scripts/ld-version.sh
View File

@ -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)