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 # Convert the version string x.y.z to a canonical 5 or 6-digit form.
  10 get_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} + ${3:-0}))
  20 }
  21
  22 orig_args="$@"
  23
  24 # Get the first line of the --version output.
  25 IFS='
  26 '
  27 set -- $(LC_ALL=C "$@" --version)
  28
  29 # Split the line on spaces.
  30 IFS=' '
  31 set -- $1
  32
  33 min_tool_version=$(dirname $0)/min-tool-version.sh
  34
  35 if [ "$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"
  41 elif [ "$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
  44 else
  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
  58 fi
  59
  60 # There may be something after the version, such as a distribution's package
  61 # release number (like Fedora's "2.34-4.fc32") or punctuation (like LLD briefly
  62 # added before the "compatible with GNU linkers" string), so remove everything
  63 # after just numbers and periods.
  64 version=${version%%[!0-9.]*}
  65
  66 cversion=$(get_canonical_version $version)
  67 min_cversion=$(get_canonical_version $min_version)
  68
  69 if [ "$cversion" -lt "$min_cversion" ]; then
  70         echo >&2 "***"
  71         echo >&2 "*** Linker is too old."
  72         echo >&2 "***   Your $disp_name version:    $version"
  73         echo >&2 "***   Minimum $disp_name version: $min_version"
  74         echo >&2 "***"
  75         exit 1
  76 fi
  77
  78 echo $name $cversion