xref: /openbmc/linux/scripts/mkcompile_h (revision 1da177e4) 
1TARGET=$1
2ARCH=$2
3SMP=$3
4CC=$4
5
6# If compile.h exists already and we don't own autoconf.h
7# (i.e. we're not the same user who did make *config), don't
8# modify compile.h
9# So "sudo make install" won't change the "compiled by <user>"
10# do "compiled by root"
11
12if [ -r $TARGET -a ! -O include/linux/autoconf.h ]; then
13  echo "  SKIPPED $TARGET"
14  exit 0
15fi
16
17# Do not expand names
18set -f
19
20if [ -r .version ]; then
21  VERSION=`cat .version`
22else
23  VERSION=0
24  echo 0 > .version
25fi
26
27
28UTS_VERSION="#$VERSION"
29if [ -n "$SMP" ] ; then UTS_VERSION="$UTS_VERSION SMP"; fi
30UTS_VERSION="$UTS_VERSION `LC_ALL=C LANG=C date`"
31
32# Truncate to maximum length
33
34UTS_LEN=64
35UTS_TRUNCATE="sed -e s/\(.\{1,$UTS_LEN\}\).*/\1/"
36
37# Generate a temporary compile.h
38
39( echo /\* This file is auto generated, version $VERSION \*/
40
41  echo \#define UTS_MACHINE \"$ARCH\"
42
43  echo \#define UTS_VERSION \"`echo $UTS_VERSION | $UTS_TRUNCATE`\"
44
45  echo \#define LINUX_COMPILE_TIME \"`LC_ALL=C LANG=C date +%T`\"
46  echo \#define LINUX_COMPILE_BY \"`whoami`\"
47  echo \#define LINUX_COMPILE_HOST \"`hostname | $UTS_TRUNCATE`\"
48
49  if [ -x /bin/dnsdomainname ]; then
50    echo \#define LINUX_COMPILE_DOMAIN \"`dnsdomainname | $UTS_TRUNCATE`\"
51  elif [ -x /bin/domainname ]; then
52    echo \#define LINUX_COMPILE_DOMAIN \"`domainname | $UTS_TRUNCATE`\"
53  else
54    echo \#define LINUX_COMPILE_DOMAIN
55  fi
56
57  echo \#define LINUX_COMPILER \"`$CC -v 2>&1 | tail -n 1`\"
58) > .tmpcompile
59
60# Only replace the real compile.h if the new one is different,
61# in order to preserve the timestamp and avoid unnecessary
62# recompilations.
63# We don't consider the file changed if only the date/time changed.
64# A kernel config change will increase the generation number, thus
65# causing compile.h to be updated (including date/time) due to the
66# changed comment in the
67# first line.
68
69if [ -r $TARGET ] && \
70      grep -v 'UTS_VERSION\|LINUX_COMPILE_TIME' $TARGET > .tmpver.1 && \
71      grep -v 'UTS_VERSION\|LINUX_COMPILE_TIME' .tmpcompile > .tmpver.2 && \
72      cmp -s .tmpver.1 .tmpver.2; then
73   rm -f .tmpcompile
74else
75   echo "  UPD     $TARGET"
76   mv -f .tmpcompile $TARGET
77fi
78rm -f .tmpver.1 .tmpver.2
79