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 VERSION=$(cat .version 2>/dev/null || echo 1) 32else 33 VERSION=$KBUILD_BUILD_VERSION 34fi 35 36if [ -z "$KBUILD_BUILD_TIMESTAMP" ]; then 37 TIMESTAMP=`date` 38else 39 TIMESTAMP=$KBUILD_BUILD_TIMESTAMP 40fi 41if test -z "$KBUILD_BUILD_USER"; then 42 LINUX_COMPILE_BY=$(whoami | sed 's/\\/\\\\/') 43else 44 LINUX_COMPILE_BY=$KBUILD_BUILD_USER 45fi 46if test -z "$KBUILD_BUILD_HOST"; then 47 LINUX_COMPILE_HOST=`hostname` 48else 49 LINUX_COMPILE_HOST=$KBUILD_BUILD_HOST 50fi 51 52UTS_VERSION="#$VERSION" 53CONFIG_FLAGS="" 54if [ -n "$SMP" ] ; then CONFIG_FLAGS="SMP"; fi 55if [ -n "$PREEMPT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"; fi 56UTS_VERSION="$UTS_VERSION $CONFIG_FLAGS $TIMESTAMP" 57 58# Truncate to maximum length 59 60UTS_LEN=64 61UTS_TRUNCATE="cut -b -$UTS_LEN" 62 63# Generate a temporary compile.h 64 65{ echo /\* This file is auto generated, version $VERSION \*/ 66 if [ -n "$CONFIG_FLAGS" ] ; then echo "/* $CONFIG_FLAGS */"; fi 67 68 echo \#define UTS_MACHINE \"$ARCH\" 69 70 echo \#define UTS_VERSION \"`echo $UTS_VERSION | $UTS_TRUNCATE`\" 71 72 echo \#define LINUX_COMPILE_BY \"`echo $LINUX_COMPILE_BY | $UTS_TRUNCATE`\" 73 echo \#define LINUX_COMPILE_HOST \"`echo $LINUX_COMPILE_HOST | $UTS_TRUNCATE`\" 74 75 echo \#define LINUX_COMPILER \"`$CC -v 2>&1 | grep ' version ' | sed 's/[[:space:]]*$//'`\" 76} > .tmpcompile 77 78# Only replace the real compile.h if the new one is different, 79# in order to preserve the timestamp and avoid unnecessary 80# recompilations. 81# We don't consider the file changed if only the date/time changed. 82# A kernel config change will increase the generation number, thus 83# causing compile.h to be updated (including date/time) due to the 84# changed comment in the 85# first line. 86 87if [ -r $TARGET ] && \ 88 grep -v 'UTS_VERSION' $TARGET > .tmpver.1 && \ 89 grep -v 'UTS_VERSION' .tmpcompile > .tmpver.2 && \ 90 cmp -s .tmpver.1 .tmpver.2; then 91 rm -f .tmpcompile 92else 93 vecho " UPD $TARGET" 94 mv -f .tmpcompile $TARGET 95fi 96rm -f .tmpver.1 .tmpver.2 97