#!/bin/sh
  # SPDX-License-Identifier: GPL-2.0
  #
  # Print the compiler name and its version in a 5 or 6-digit form.
  # Also, perform the minimum version check.
  
  set -e

  # Print the compiler name and some version components.
  get_compiler_info()
  {
  	cat <<- EOF | "$@" -E -P -x c - 2>/dev/null
  	#if defined(__clang__)
  	Clang	__clang_major__  __clang_minor__  __clang_patchlevel__
  	#elif defined(__INTEL_COMPILER)
  	ICC	__INTEL_COMPILER  __INTEL_COMPILER_UPDATE
  	#elif defined(__GNUC__)
  	GCC	__GNUC__  __GNUC_MINOR__  __GNUC_PATCHLEVEL__
  	#else
  	unknown
  	#endif
  	EOF
  }
  
  # Convert the version string x.y.z to a canonical 5 or 6-digit form.
  get_canonical_version()
  {
  	IFS=.
  	set -- $1
  	echo $((10000 * $1 + 100 * $2 + $3))
  }
  
  # $@ instead of $1 because multiple words might be given, e.g. CC="ccache gcc".
  orig_args="$@"
  set -- $(get_compiler_info "$@")
  
  name=$1

  min_tool_version=$(dirname $0)/min-tool-version.sh

  case "$name" in
  GCC)
  	version=$2.$3.$4

  	min_version=$($min_tool_version gcc)

  	;;
  Clang)
  	version=$2.$3.$4

  	min_version=$($min_tool_version llvm)

  	;;
  ICC)
  	version=$(($2 / 100)).$(($2 % 100)).$3

  	min_version=$($min_tool_version icc)

  	;;
  *)
  	echo "$orig_args: unknown compiler" >&2
  	exit 1
  	;;
  esac
  
  cversion=$(get_canonical_version $version)
  min_cversion=$(get_canonical_version $min_version)
  
  if [ "$cversion" -lt "$min_cversion" ]; then
  	echo >&2 "***"
  	echo >&2 "*** Compiler is too old."
  	echo >&2 "***   Your $name version:    $version"
  	echo >&2 "***   Minimum $name version: $min_version"
  	echo >&2 "***"
  	exit 1
  fi
  
  echo $name $cversion