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TARGET=$1
ARCH=$2
SMP=$3
CC=$4
# If compile.h exists already and we don't own autoconf.h
# (i.e. we're not the same user who did make *config), don't
# modify compile.h
# So "sudo make install" won't change the "compiled by <user>"
# do "compiled by root"
if [ -r $TARGET -a ! -O include/linux/autoconf.h ]; then
echo " SKIPPED $TARGET"
exit 0
fi
# Do not expand names
set -f
if [ -r .version ]; then
VERSION=`cat .version`
else
VERSION=0
echo 0 > .version
fi
UTS_VERSION="#$VERSION"
if [ -n "$SMP" ] ; then UTS_VERSION="$UTS_VERSION SMP"; fi
UTS_VERSION="$UTS_VERSION `LC_ALL=C LANG=C date`"
# Truncate to maximum length
UTS_LEN=64
UTS_TRUNCATE="sed -e s/\(.\{1,$UTS_LEN\}\).*/\1/"
# Generate a temporary compile.h
( echo /\* This file is auto generated, version $VERSION \*/
echo \#define UTS_MACHINE \"$ARCH\"
echo \#define UTS_VERSION \"`echo $UTS_VERSION | $UTS_TRUNCATE`\"
echo \#define LINUX_COMPILE_TIME \"`LC_ALL=C LANG=C date +%T`\"
echo \#define LINUX_COMPILE_BY \"`whoami`\"
echo \#define LINUX_COMPILE_HOST \"`hostname | $UTS_TRUNCATE`\"
if [ -x /bin/dnsdomainname ]; then
echo \#define LINUX_COMPILE_DOMAIN \"`dnsdomainname | $UTS_TRUNCATE`\"
elif [ -x /bin/domainname ]; then
echo \#define LINUX_COMPILE_DOMAIN \"`domainname | $UTS_TRUNCATE`\"
else
echo \#define LINUX_COMPILE_DOMAIN
fi
echo \#define LINUX_COMPILER \"`$CC -v 2>&1 | tail -n 1`\"
) > .tmpcompile
# Only replace the real compile.h if the new one is different,
# in order to preserve the timestamp and avoid unnecessary
# recompilations.
# We don't consider the file changed if only the date/time changed.
# A kernel config change will increase the generation number, thus
# causing compile.h to be updated (including date/time) due to the
# changed comment in the
# first line.
if [ -r $TARGET ] && \
grep -v 'UTS_VERSION\|LINUX_COMPILE_TIME' $TARGET > .tmpver.1 && \
grep -v 'UTS_VERSION\|LINUX_COMPILE_TIME' .tmpcompile > .tmpver.2 && \
cmp -s .tmpver.1 .tmpver.2; then
rm -f .tmpcompile
else
echo " UPD $TARGET"
mv -f .tmpcompile $TARGET
fi
rm -f .tmpver.1 .tmpver.2