#!/bin/sh# SPDX-License-Identifier: GPL-2.0 TARGET=$1ARCH=$2SMP=$3PREEMPT=$4PREEMPT_RT=$5CC_VERSION="$6"LD=$7 # Do not expand namesset -f # Fix the language to get consistent outputLC_ALL=Cexport LC_ALL if [ -z "$KBUILD_BUILD_VERSION" ]; then	VERSION=$(cat .version 2>/dev/null || echo 1)else	VERSION=$KBUILD_BUILD_VERSIONfi if [ -z "$KBUILD_BUILD_TIMESTAMP" ]; then	TIMESTAMP=`date`else	TIMESTAMP=$KBUILD_BUILD_TIMESTAMPfiif test -z "$KBUILD_BUILD_USER"; then	LINUX_COMPILE_BY=$(whoami | sed 's/\\/\\\\/')else	LINUX_COMPILE_BY=$KBUILD_BUILD_USERfiif test -z "$KBUILD_BUILD_HOST"; then	LINUX_COMPILE_HOST=`uname -n`else	LINUX_COMPILE_HOST=$KBUILD_BUILD_HOSTfi UTS_VERSION="#$VERSION"CONFIG_FLAGS=""if [ -n "$SMP" ] ; then CONFIG_FLAGS="SMP"; fiif [ -n "$PREEMPT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"; fiif [ -n "$PREEMPT_RT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT_RT"; fi # Truncate to maximum lengthUTS_LEN=64UTS_VERSION="$(echo $UTS_VERSION $CONFIG_FLAGS $TIMESTAMP | cut -b -$UTS_LEN)" # Generate a temporary compile.h { echo /\* This file is auto generated, version $VERSION \*/  if [ -n "$CONFIG_FLAGS" ] ; then echo "/* $CONFIG_FLAGS */"; fi   echo \#define UTS_MACHINE \"$ARCH\"   echo \#define UTS_VERSION \"$UTS_VERSION\"   printf '#define LINUX_COMPILE_BY "%s"\n' "$LINUX_COMPILE_BY"  echo \#define LINUX_COMPILE_HOST \"$LINUX_COMPILE_HOST\"   LD_VERSION=$($LD -v | head -n1 | sed 's/(compatible with [^)]*)//' \		      | sed 's/[[:space:]]*$//')  printf '#define LINUX_COMPILER "%s"\n' "$CC_VERSION, $LD_VERSION"} > .tmpcompile # Only replace the real compile.h if the new one is different,# in order to preserve the timestamp and avoid unnecessary# recompilations.# We don't consider the file changed if only the date/time changed,# unless KBUILD_BUILD_TIMESTAMP was explicitly set (e.g. for# reproducible builds with that value referring to a commit timestamp).# A kernel config change will increase the generation number, thus# causing compile.h to be updated (including date/time) due to the# changed comment in the# first line. if [ -z "$KBUILD_BUILD_TIMESTAMP" ]; then   IGNORE_PATTERN="UTS_VERSION"else   IGNORE_PATTERN="NOT_A_PATTERN_TO_BE_MATCHED"fi if [ -r $TARGET ] && \      grep -v $IGNORE_PATTERN $TARGET > .tmpver.1 && \      grep -v $IGNORE_PATTERN .tmpcompile > .tmpver.2 && \      cmp -s .tmpver.1 .tmpver.2; then   rm -f .tmpcompileelse   echo "  UPD     $TARGET"   mv -f .tmpcompile $TARGETfirm -f .tmpver.1 .tmpver.2