#!/bin/sh
  # SPDX-License-Identifier: GPL-2.0
  srctree=$(dirname "$0")
  
  SHOW_ERROR=
  if [ "$1" = "--show-error" ] ; then
  	SHOW_ERROR=1
  	shift || true
  fi
  
  gccplugins_dir=$($3 -print-file-name=plugin)
  plugincc=$($1 -E -x c++ - -o /dev/null -I"${srctree}"/gcc-plugins -I"${gccplugins_dir}"/include 2>&1 <<EOF
  #include "gcc-common.h"
  #if BUILDING_GCC_VERSION >= 4008 || defined(ENABLE_BUILD_WITH_CXX)
  #warning $2 CXX
  #else
  #warning $1 CC
  #endif
  EOF
  )
  
  if [ $? -ne 0 ]
  then
  	if [ -n "$SHOW_ERROR" ] ; then
  		echo "${plugincc}" >&2
  	fi
  	exit 1
  fi
  
  case "$plugincc" in
  	*"$1 CC"*)
  		echo "$1"
  		exit 0
  		;;
  
  	*"$2 CXX"*)
  		# the c++ compiler needs another test, see below
  		;;
  
  	*)
  		exit 1
  		;;
  esac
  
  # we need a c++ compiler that supports the designated initializer GNU extension
  plugincc=$($2 -c -x c++ -std=gnu++98 - -fsyntax-only -I"${srctree}"/gcc-plugins -I"${gccplugins_dir}"/include 2>&1 <<EOF
  #include "gcc-common.h"
  class test {
  public:
  	int test;
  } test = {
  	.test = 1
  };
  EOF
  )
  
  if [ $? -eq 0 ]
  then
  	echo "$2"
  	exit 0
  fi
  
  if [ -n "$SHOW_ERROR" ] ; then
  	echo "${plugincc}" >&2
  fi
  exit 1