scripts/cc-version.sh

   1 #!/bin/sh
   2 # SPDX-License-Identifier: GPL-2.0
   3 #
   4 # Print the C compiler name and its version in a 5 or 6-digit form.
   5 # Also, perform the minimum version check.
   6
   7 set -e
   8
   9 # Print the C compiler name and some version components.
  10 get_c_compiler_info()
  11 {
  12         cat <<- EOF | "$@" -E -P -x c - 2>/dev/null
  13         #if defined(__clang__)
  14         Clang   __clang_major__  __clang_minor__  __clang_patchlevel__
  15         #elif defined(__GNUC__)
  16         GCC     __GNUC__  __GNUC_MINOR__  __GNUC_PATCHLEVEL__
  17         #else
  18         unknown
  19         #endif
  20         EOF
  21 }
  22
  23 # Convert the version string x.y.z to a canonical 5 or 6-digit form.
  24 get_canonical_version()
  25 {
  26         IFS=.
  27         set -- $1
  28         echo $((10000 * $1 + 100 * $2 + $3))
  29 }
  30
  31 # $@ instead of $1 because multiple words might be given, e.g. CC="ccache gcc".
  32 orig_args="$@"
  33 set -- $(get_c_compiler_info "$@")
  34
  35 name=$1
  36
  37 min_tool_version=$(dirname $0)/min-tool-version.sh
  38
  39 case "$name" in
  40 GCC)
  41         version=$2.$3.$4
  42         min_version=$($min_tool_version gcc)
  43         ;;
  44 Clang)
  45         version=$2.$3.$4
  46         min_version=$($min_tool_version llvm)
  47         ;;
  48 *)
  49         echo "$orig_args: unknown C compiler" >&2
  50         exit 1
  51         ;;
  52 esac
  53
  54 cversion=$(get_canonical_version $version)
  55 min_cversion=$(get_canonical_version $min_version)
  56
  57 if [ "$cversion" -lt "$min_cversion" ]; then
  58         echo >&2 "***"
  59         echo >&2 "*** C compiler is too old."
  60         echo >&2 "***   Your $name version:    $version"
  61         echo >&2 "***   Minimum $name version: $min_version"
  62         echo >&2 "***"
  63         exit 1
  64 fi
  65
  66 echo $name $cversion