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authorNathan Chancellor <nathan@kernel.org>2024-07-07 22:06:47 -0700
committerMasahiro Yamada <masahiroy@kernel.org>2024-07-15 03:13:32 +0900
commit9852f47ac7c993990317570ff125e30ad901e213 (patch)
tree6c2da6ef1b047dcd00f620094bf7a382a3fcd58d
parent22a40d14b572deb80c0648557f4bd502d7e83826 (diff)
kbuild: Make ld-version.sh more robust against version string changes
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@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>
-rwxr-xr-xscripts/ld-version.sh8
1 files 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)