1#!/bin/sh
2# SPDX-License-Identifier: GPL-2.0
3#
4# Print the linker name and its version in a 5 or 6-digit form.
5# Also, perform the minimum version check.
6
7set -e
8
9# Convert the version string x.y.z to a canonical 5 or 6-digit form.
10get_canonical_version()
11{
12	IFS=.
13	set -- $1
14
15	# If the 2nd or 3rd field is missing, fill it with a zero.
16	#
17	# The 4th field, if present, is ignored.
18	# This occurs in development snapshots as in 2.35.1.20201116
19	echo $((10000 * $1 + 100 * ${2:-0} + ${3:-0}))
20}
21
22orig_args="$@"
23
24# Get the first line of the --version output.
25IFS='
26'
27set -- $(LC_ALL=C "$@" --version)
28
29# Split the line on spaces.
30IFS=' '
31set -- $1
32
33min_tool_version=$(dirname $0)/min-tool-version.sh
34
35if [ "$1" = GNU -a "$2" = ld ]; then
36	shift $(($# - 1))
37	version=$1
38	min_version=$($min_tool_version binutils)
39	name=BFD
40	disp_name="GNU ld"
41elif [ "$1" = GNU -a "$2" = gold ]; then
42	echo "gold linker is not supported as it is not capable of linking the kernel proper." >&2
43	exit 1
44else
45	while [ $# -gt 1 -a "$1" != "LLD" ]; do
46		shift
47	done
48
49	if [ "$1" = LLD ]; then
50		version=$2
51		min_version=$($min_tool_version llvm)
52		name=LLD
53		disp_name=LLD
54	else
55		echo "$orig_args: unknown linker" >&2
56		exit 1
57	fi
58fi
59
60# Some distributions append a package release number, as in 2.34-4.fc32
61# Trim the hyphen and any characters that follow.
62version=${version%-*}
63
64cversion=$(get_canonical_version $version)
65min_cversion=$(get_canonical_version $min_version)
66
67if [ "$cversion" -lt "$min_cversion" ]; then
68	echo >&2 "***"
69	echo >&2 "*** Linker is too old."
70	echo >&2 "***   Your $disp_name version:    $version"
71	echo >&2 "***   Minimum $disp_name version: $min_version"
72	echo >&2 "***"
73	exit 1
74fi
75
76echo $name $cversion
77