1#!/bin/sh 2# SPDX-License-Identifier: GPL-2.0 3 4TARGET=$1 5ARCH=$2 6SMP=$3 7PREEMPT=$4 8PREEMPT_RT=$5 9CC=$6 10LD=$7 11 12vecho() { [ "${quiet}" = "silent_" ] || echo "$@" ; } 13 14# Do not expand names 15set -f 16 17# Fix the language to get consistent output 18LC_ALL=C 19export LC_ALL 20 21if [ -z "$KBUILD_BUILD_VERSION" ]; then 22 VERSION=$(cat .version 2>/dev/null || echo 1) 23else 24 VERSION=$KBUILD_BUILD_VERSION 25fi 26 27if [ -z "$KBUILD_BUILD_TIMESTAMP" ]; then 28 TIMESTAMP=`date` 29else 30 TIMESTAMP=$KBUILD_BUILD_TIMESTAMP 31fi 32if test -z "$KBUILD_BUILD_USER"; then 33 LINUX_COMPILE_BY=$(whoami | sed 's/\\/\\\\/') 34else 35 LINUX_COMPILE_BY=$KBUILD_BUILD_USER 36fi 37if test -z "$KBUILD_BUILD_HOST"; then 38 LINUX_COMPILE_HOST=`hostname` 39else 40 LINUX_COMPILE_HOST=$KBUILD_BUILD_HOST 41fi 42 43UTS_VERSION="#$VERSION" 44CONFIG_FLAGS="" 45if [ -n "$SMP" ] ; then CONFIG_FLAGS="SMP"; fi 46if [ -n "$PREEMPT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"; fi 47if [ -n "$PREEMPT_RT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT_RT"; fi 48 49# Truncate to maximum length 50UTS_LEN=64 51UTS_VERSION="$(echo $UTS_VERSION $CONFIG_FLAGS $TIMESTAMP | cut -b -$UTS_LEN)" 52 53# Generate a temporary compile.h 54 55{ echo /\* This file is auto generated, version $VERSION \*/ 56 if [ -n "$CONFIG_FLAGS" ] ; then echo "/* $CONFIG_FLAGS */"; fi 57 58 echo \#define UTS_MACHINE \"$ARCH\" 59 60 echo \#define UTS_VERSION \"$UTS_VERSION\" 61 62 printf '#define LINUX_COMPILE_BY "%s"\n' "$LINUX_COMPILE_BY" 63 echo \#define LINUX_COMPILE_HOST \"$LINUX_COMPILE_HOST\" 64 65 CC_VERSION=$($CC -v 2>&1 | grep ' version ' | sed 's/[[:space:]]*$//') 66 LD_VERSION=$($LD -v | head -n1 | sed 's/(compatible with [^)]*)//' \ 67 | sed 's/[[:space:]]*$//') 68 printf '#define LINUX_COMPILER "%s"\n' "$CC_VERSION, $LD_VERSION" 69} > .tmpcompile 70 71# Only replace the real compile.h if the new one is different, 72# in order to preserve the timestamp and avoid unnecessary 73# recompilations. 74# We don't consider the file changed if only the date/time changed. 75# A kernel config change will increase the generation number, thus 76# causing compile.h to be updated (including date/time) due to the 77# changed comment in the 78# first line. 79 80if [ -r $TARGET ] && \ 81 grep -v 'UTS_VERSION' $TARGET > .tmpver.1 && \ 82 grep -v 'UTS_VERSION' .tmpcompile > .tmpver.2 && \ 83 cmp -s .tmpver.1 .tmpver.2; then 84 rm -f .tmpcompile 85else 86 vecho " UPD $TARGET" 87 mv -f .tmpcompile $TARGET 88fi 89rm -f .tmpver.1 .tmpver.2 90