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