1#!/bin/sh 2# SPDX-License-Identifier: GPL-2.0 3 4TARGET=$1 5ARCH=$2 6SMP=$3 7PREEMPT=$4 8PREEMPT_RT=$5 9CC=$6 10 11vecho() { [ "${quiet}" = "silent_" ] || echo "$@" ; } 12 13# If compile.h exists already and we don't own autoconf.h 14# (i.e. we're not the same user who did make *config), don't 15# modify compile.h 16# So "sudo make install" won't change the "compiled by <user>" 17# do "compiled by root" 18 19if [ -r $TARGET -a ! -O include/generated/autoconf.h ]; then 20 vecho " SKIPPED $TARGET" 21 exit 0 22fi 23 24# Do not expand names 25set -f 26 27# Fix the language to get consistent output 28LC_ALL=C 29export LC_ALL 30 31if [ -z "$KBUILD_BUILD_VERSION" ]; then 32 VERSION=$(cat .version 2>/dev/null || echo 1) 33else 34 VERSION=$KBUILD_BUILD_VERSION 35fi 36 37if [ -z "$KBUILD_BUILD_TIMESTAMP" ]; then 38 TIMESTAMP=`date` 39else 40 TIMESTAMP=$KBUILD_BUILD_TIMESTAMP 41fi 42if test -z "$KBUILD_BUILD_USER"; then 43 LINUX_COMPILE_BY=$(whoami | sed 's/\\/\\\\/') 44else 45 LINUX_COMPILE_BY=$KBUILD_BUILD_USER 46fi 47if test -z "$KBUILD_BUILD_HOST"; then 48 LINUX_COMPILE_HOST=`hostname` 49else 50 LINUX_COMPILE_HOST=$KBUILD_BUILD_HOST 51fi 52 53UTS_VERSION="#$VERSION" 54CONFIG_FLAGS="" 55if [ -n "$SMP" ] ; then CONFIG_FLAGS="SMP"; fi 56if [ -n "$PREEMPT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"; fi 57if [ -n "$PREEMPT_RT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT_RT"; fi 58UTS_VERSION="$UTS_VERSION $CONFIG_FLAGS $TIMESTAMP" 59 60# Truncate to maximum length 61 62UTS_LEN=64 63UTS_TRUNCATE="cut -b -$UTS_LEN" 64 65# Generate a temporary compile.h 66 67{ echo /\* This file is auto generated, version $VERSION \*/ 68 if [ -n "$CONFIG_FLAGS" ] ; then echo "/* $CONFIG_FLAGS */"; fi 69 70 echo \#define UTS_MACHINE \"$ARCH\" 71 72 echo \#define UTS_VERSION \"`echo $UTS_VERSION | $UTS_TRUNCATE`\" 73 74 echo \#define LINUX_COMPILE_BY \"`echo $LINUX_COMPILE_BY | $UTS_TRUNCATE`\" 75 echo \#define LINUX_COMPILE_HOST \"`echo $LINUX_COMPILE_HOST | $UTS_TRUNCATE`\" 76 77 echo \#define LINUX_COMPILER \"`$CC -v 2>&1 | grep ' version ' | sed 's/[[:space:]]*$//'`\" 78} > .tmpcompile 79 80# Only replace the real compile.h if the new one is different, 81# in order to preserve the timestamp and avoid unnecessary 82# recompilations. 83# We don't consider the file changed if only the date/time changed. 84# A kernel config change will increase the generation number, thus 85# causing compile.h to be updated (including date/time) due to the 86# changed comment in the 87# first line. 88 89if [ -r $TARGET ] && \ 90 grep -v 'UTS_VERSION' $TARGET > .tmpver.1 && \ 91 grep -v 'UTS_VERSION' .tmpcompile > .tmpver.2 && \ 92 cmp -s .tmpver.1 .tmpver.2; then 93 rm -f .tmpcompile 94else 95 vecho " UPD $TARGET" 96 mv -f .tmpcompile $TARGET 97fi 98rm -f .tmpver.1 .tmpver.2 99