#!/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 # When you raise the minimum compiler version, please update# Documentation/process/changes.rst as well.gcc_min_version=4.9.0clang_min_version=10.0.1icc_min_version=16.0.3 # temporary # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63293# https://lore.kernel.org/r/20210107111841.GN1551@shell.armlinux.org.ukif [ "$SRCARCH" = arm64 ]; then	gcc_min_version=5.1.0fi # Print the compiler name and some version components.get_compiler_info(){	cat <<- EOF | "$@" -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=$1 case "$name" inGCC)	version=$2.$3.$4	min_version=$gcc_min_version	;;Clang)	version=$2.$3.$4	min_version=$clang_min_version	;;ICC)	version=$(($2 / 100)).$(($2 % 100)).$3	min_version=$icc_min_version	;;*)	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 1fi echo $name $cversion