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