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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
#
# Print the linker name and its version in a 5 or 6-digit form.
# Also, perform the minimum version check.
set -e
# Convert the version string x.y.z to a canonical 5 or 6-digit form.
get_canonical_version()
{
IFS=.
set -- $1
# If the 2nd or 3rd field is missing, fill it with a zero.
#
# The 4th field, if present, is ignored.
# This occurs in development snapshots as in 2.35.1.20201116
echo $((10000 * $1 + 100 * ${2:-0} + ${3:-0}))
}
orig_args="$@"
# Get the first line of the --version output.
IFS='
'
set -- $(LC_ALL=C "$@" --version)
# Split the line on spaces.
IFS=' '
set -- $1
min_tool_version=$(dirname $0)/min-tool-version.sh
if [ "$1" = GNU -a "$2" = ld ]; then
shift $(($# - 1))
version=$1
min_version=$($min_tool_version binutils)
name=BFD
disp_name="GNU ld"
elif [ "$1" = GNU -a "$2" = gold ]; then
echo "gold linker is not supported as it is not capable of linking the kernel proper." >&2
exit 1
else
while [ $# -gt 1 -a "$1" != "LLD" ]; do
shift
done
if [ "$1" = LLD ]; then
version=$2
min_version=$($min_tool_version llvm)
name=LLD
disp_name=LLD
else
echo "$orig_args: unknown linker" >&2
exit 1
fi
fi
# 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 $min_version)
if [ "$cversion" -lt "$min_cversion" ]; then
echo >&2 "***"
echo >&2 "*** Linker is too old."
echo >&2 "*** Your $disp_name version: $version"
echo >&2 "*** Minimum $disp_name version: $min_version"
echo >&2 "***"
exit 1
fi
echo $name $cversion
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