1#!/bin/sh 2# SPDX-License-Identifier: GPL-2.0 3 4TARGET=$1 5ARCH=$2 6SMP=$3 7PREEMPT=$4 8PREEMPT_RT=$5 9CC_VERSION="$6" 10LD=$7 11 12# Do not expand names 13set -f 14 15# Fix the language to get consistent output 16LC_ALL=C 17export LC_ALL 18 19if [ -z "$KBUILD_BUILD_VERSION" ]; then 20 VERSION=$(cat .version 2>/dev/null || echo 1) 21else 22 VERSION=$KBUILD_BUILD_VERSION 23fi 24 25if [ -z "$KBUILD_BUILD_TIMESTAMP" ]; then 26 TIMESTAMP=`date` 27else 28 TIMESTAMP=$KBUILD_BUILD_TIMESTAMP 29fi 30if test -z "$KBUILD_BUILD_USER"; then 31 LINUX_COMPILE_BY=$(whoami | sed 's/\\/\\\\/') 32else 33 LINUX_COMPILE_BY=$KBUILD_BUILD_USER 34fi 35if test -z "$KBUILD_BUILD_HOST"; then 36 LINUX_COMPILE_HOST=`uname -n` 37else 38 LINUX_COMPILE_HOST=$KBUILD_BUILD_HOST 39fi 40 41UTS_VERSION="#$VERSION" 42CONFIG_FLAGS="" 43if [ -n "$SMP" ] ; then CONFIG_FLAGS="SMP"; fi 44if [ -n "$PREEMPT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"; fi 45if [ -n "$PREEMPT_RT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT_RT"; fi 46 47# Truncate to maximum length 48UTS_LEN=64 49UTS_VERSION="$(echo $UTS_VERSION $CONFIG_FLAGS $TIMESTAMP | cut -b -$UTS_LEN)" 50 51# Generate a temporary compile.h 52 53{ echo /\* This file is auto generated, version $VERSION \*/ 54 if [ -n "$CONFIG_FLAGS" ] ; then echo "/* $CONFIG_FLAGS */"; fi 55 56 echo \#define UTS_MACHINE \"$ARCH\" 57 58 echo \#define UTS_VERSION \"$UTS_VERSION\" 59 60 printf '#define LINUX_COMPILE_BY "%s"\n' "$LINUX_COMPILE_BY" 61 echo \#define LINUX_COMPILE_HOST \"$LINUX_COMPILE_HOST\" 62 63 LD_VERSION=$($LD -v | head -n1 | sed 's/(compatible with [^)]*)//' \ 64 | sed 's/[[:space:]]*$//') 65 printf '#define LINUX_COMPILER "%s"\n' "$CC_VERSION, $LD_VERSION" 66} > .tmpcompile 67 68# Only replace the real compile.h if the new one is different, 69# in order to preserve the timestamp and avoid unnecessary 70# recompilations. 71# We don't consider the file changed if only the date/time changed, 72# unless KBUILD_BUILD_TIMESTAMP was explicitly set (e.g. for 73# reproducible builds with that value referring to a commit timestamp). 74# A kernel config change will increase the generation number, thus 75# causing compile.h to be updated (including date/time) due to the 76# changed comment in the 77# first line. 78 79if [ -z "$KBUILD_BUILD_TIMESTAMP" ]; then 80 IGNORE_PATTERN="UTS_VERSION" 81else 82 IGNORE_PATTERN="NOT_A_PATTERN_TO_BE_MATCHED" 83fi 84 85if [ -r $TARGET ] && \ 86 grep -v $IGNORE_PATTERN $TARGET > .tmpver.1 && \ 87 grep -v $IGNORE_PATTERN .tmpcompile > .tmpver.2 && \ 88 cmp -s .tmpver.1 .tmpver.2; then 89 rm -f .tmpcompile 90else 91 echo " UPD $TARGET" 92 mv -f .tmpcompile $TARGET 93fi 94rm -f .tmpver.1 .tmpver.2 95