xref: /openbmc/linux/scripts/mkcompile_h (revision bd5bdd87) 
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 $TARGET"
15  exit 0
16fi
17
18# Do not expand names
19set -f
20
21if [ -r .version ]; then
22  VERSION=`cat .version`
23else
24  VERSION=0
25  echo 0 > .version
26fi
27
28
29UTS_VERSION="#$VERSION"
30CONFIG_FLAGS=""
31if [ -n "$SMP" ] ; then CONFIG_FLAGS="SMP"; fi
32if [ -n "$PREEMPT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"; fi
33UTS_VERSION="$UTS_VERSION $CONFIG_FLAGS `LC_ALL=C LANG=C date`"
34
35# Truncate to maximum length
36
37UTS_LEN=64
38UTS_TRUNCATE="sed -e s/\(.\{1,$UTS_LEN\}\).*/\1/"
39
40# Generate a temporary compile.h
41
42( echo /\* This file is auto generated, version $VERSION \*/
43  if [ -n "$CONFIG_FLAGS" ] ; then echo "/* $CONFIG_FLAGS */"; fi
44
45  echo \#define UTS_MACHINE \"$ARCH\"
46
47  echo \#define UTS_VERSION \"`echo $UTS_VERSION | $UTS_TRUNCATE`\"
48
49  echo \#define LINUX_COMPILE_TIME \"`LC_ALL=C LANG=C date +%T`\"
50  echo \#define LINUX_COMPILE_BY \"`whoami`\"
51  echo \#define LINUX_COMPILE_HOST \"`hostname | $UTS_TRUNCATE`\"
52
53  if [ -x /bin/dnsdomainname ]; then
54    echo \#define LINUX_COMPILE_DOMAIN \"`dnsdomainname | $UTS_TRUNCATE`\"
55  elif [ -x /bin/domainname ]; then
56    echo \#define LINUX_COMPILE_DOMAIN \"`domainname | $UTS_TRUNCATE`\"
57  else
58    echo \#define LINUX_COMPILE_DOMAIN
59  fi
60
61  echo \#define LINUX_COMPILER \"`$CC -v 2>&1 | tail -n 1`\"
62) > .tmpcompile
63
64# Only replace the real compile.h if the new one is different,
65# in order to preserve the timestamp and avoid unnecessary
66# recompilations.
67# We don't consider the file changed if only the date/time changed.
68# A kernel config change will increase the generation number, thus
69# causing compile.h to be updated (including date/time) due to the
70# changed comment in the
71# first line.
72
73if [ -r $TARGET ] && \
74      grep -v 'UTS_VERSION\|LINUX_COMPILE_TIME' $TARGET > .tmpver.1 && \
75      grep -v 'UTS_VERSION\|LINUX_COMPILE_TIME' .tmpcompile > .tmpver.2 && \
76      cmp -s .tmpver.1 .tmpver.2; then
77   rm -f .tmpcompile
78else
79   echo "  UPD     $TARGET"
80   mv -f .tmpcompile $TARGET
81fi
82rm -f .tmpver.1 .tmpver.2
83