scripts/ld-version.sh

   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
   7 set -e
   8
   9 # When you raise the minimum linker version, please update
  10 # Documentation/process/changes.rst as well.
  11 bfd_min_version=2.23.0
  12 lld_min_version=10.0.1
  13
  14 # Convert the version string x.y.z to a canonical 5 or 6-digit form.
  15 get_canonical_version()
  16 {
  17         IFS=.
  18         set -- $1
  19
  20         # If the 2nd or 3rd field is missing, fill it with a zero.
  21         #
  22         # The 4th field, if present, is ignored.
  23         # This occurs in development snapshots as in 2.35.1.20201116
  24         echo $((10000 * $1 + 100 * ${2:-0} + ${3:-0}))
  25 }
  26
  27 orig_args="$@"
  28
  29 # Get the first line of the --version output.
  30 IFS='
  31 '
  32 set -- $(LC_ALL=C "$@" --version)
  33
  34 # Split the line on spaces.
  35 IFS=' '
  36 set -- $1
  37
  38 if [ "$1" = GNU -a "$2" = ld ]; then
  39         shift $(($# - 1))
  40         version=$1
  41         min_version=$bfd_min_version
  42         name=BFD
  43         disp_name="GNU ld"
  44 elif [ "$1" = GNU -a "$2" = gold ]; then
  45         echo "gold linker is not supported as it is not capable of linking the kernel proper." >&2
  46         exit 1
  47 else
  48         while [ $# -gt 1 -a "$1" != "LLD" ]; do
  49                 shift
  50         done
  51
  52         if [ "$1" = LLD ]; then
  53                 version=$2
  54                 min_version=$lld_min_version
  55                 name=LLD
  56                 disp_name=LLD
  57         else
  58                 echo "$orig_args: unknown linker" >&2
  59                 exit 1
  60         fi
  61 fi
  62
  63 # Some distributions append a package release number, as in 2.34-4.fc32
  64 # Trim the hyphen and any characters that follow.
  65 version=${version%-*}
  66
  67 cversion=$(get_canonical_version $version)
  68 min_cversion=$(get_canonical_version $min_version)
  69
  70 if [ "$cversion" -lt "$min_cversion" ]; then
  71         echo >&2 "***"
  72         echo >&2 "*** Linker is too old."
  73         echo >&2 "***   Your $disp_name version:    $version"
  74         echo >&2 "***   Minimum $disp_name version: $min_version"
  75         echo >&2 "***"
  76         exit 1
  77 fi
  78
  79 echo $name $cversion