#!/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 # When you raise the minimum linker version, please update# Documentation/process/changes.rst as well.bfd_min_version=2.23.0lld_min_version=10.0.1 # 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 if [ "$1" = GNU -a "$2" = ld ]; then	shift $(($# - 1))	version=$1	min_version=$bfd_min_version	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 1else	while [ $# -gt 1 -a "$1" != "LLD" ]; do		shift	done 	if [ "$1" = LLD ]; then		version=$2		min_version=$lld_min_version		name=LLD		disp_name=LLD	else		echo "$orig_args: unknown linker" >&2		exit 1	fifi # Some distributions append a package release number, as in 2.34-4.fc32# Trim the hyphen and any characters that follow.version=${version%-*} 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 1fi echo $name $cversion