1#!/bin/sh 2# SPDX-License-Identifier: GPL-2.0 3 4TARGET=$1 5ARCH=$2 6SMP=$3 7PREEMPT=$4 8CC=$5 9 10vecho() { [ "${quiet}" = "silent_" ] || echo "$@" ; } 11 12# If compile.h exists already and we don't own autoconf.h 13# (i.e. we're not the same user who did make *config), don't 14# modify compile.h 15# So "sudo make install" won't change the "compiled by <user>" 16# do "compiled by root" 17 18if [ -r $TARGET -a ! -O include/generated/autoconf.h ]; then 19 vecho " SKIPPED $TARGET" 20 exit 0 21fi 22 23# Do not expand names 24set -f 25 26# Fix the language to get consistent output 27LC_ALL=C 28export LC_ALL 29 30if [ -z "$KBUILD_BUILD_VERSION" ]; then 31 if [ -r .version ]; then 32 VERSION=`cat .version` 33 else 34 VERSION=0 35 echo 0 > .version 36 fi 37else 38 VERSION=$KBUILD_BUILD_VERSION 39fi 40 41if [ -z "$KBUILD_BUILD_TIMESTAMP" ]; then 42 TIMESTAMP=`date` 43else 44 TIMESTAMP=$KBUILD_BUILD_TIMESTAMP 45fi 46if test -z "$KBUILD_BUILD_USER"; then 47 LINUX_COMPILE_BY=$(whoami | sed 's/\\/\\\\/') 48else 49 LINUX_COMPILE_BY=$KBUILD_BUILD_USER 50fi 51if test -z "$KBUILD_BUILD_HOST"; then 52 LINUX_COMPILE_HOST=`hostname` 53else 54 LINUX_COMPILE_HOST=$KBUILD_BUILD_HOST 55fi 56 57UTS_VERSION="#$VERSION" 58CONFIG_FLAGS="" 59if [ -n "$SMP" ] ; then CONFIG_FLAGS="SMP"; fi 60if [ -n "$PREEMPT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"; fi 61UTS_VERSION="$UTS_VERSION $CONFIG_FLAGS $TIMESTAMP" 62 63# Truncate to maximum length 64 65UTS_LEN=64 66UTS_TRUNCATE="cut -b -$UTS_LEN" 67 68# Generate a temporary compile.h 69 70( echo /\* This file is auto generated, version $VERSION \*/ 71 if [ -n "$CONFIG_FLAGS" ] ; then echo "/* $CONFIG_FLAGS */"; fi 72 73 echo \#define UTS_MACHINE \"$ARCH\" 74 75 echo \#define UTS_VERSION \"`echo $UTS_VERSION | $UTS_TRUNCATE`\" 76 77 echo \#define LINUX_COMPILE_BY \"`echo $LINUX_COMPILE_BY | $UTS_TRUNCATE`\" 78 echo \#define LINUX_COMPILE_HOST \"`echo $LINUX_COMPILE_HOST | $UTS_TRUNCATE`\" 79 80 echo \#define LINUX_COMPILER \"`$CC -v 2>&1 | grep ' version ' | sed 's/[[:space:]]*$//'`\" 81) > .tmpcompile 82 83# Only replace the real compile.h if the new one is different, 84# in order to preserve the timestamp and avoid unnecessary 85# recompilations. 86# We don't consider the file changed if only the date/time changed. 87# A kernel config change will increase the generation number, thus 88# causing compile.h to be updated (including date/time) due to the 89# changed comment in the 90# first line. 91 92if [ -r $TARGET ] && \ 93 grep -v 'UTS_VERSION' $TARGET > .tmpver.1 && \ 94 grep -v 'UTS_VERSION' .tmpcompile > .tmpver.2 && \ 95 cmp -s .tmpver.1 .tmpver.2; then 96 rm -f .tmpcompile 97else 98 vecho " UPD $TARGET" 99 mv -f .tmpcompile $TARGET 100fi 101rm -f .tmpver.1 .tmpver.2 102