mkcompile_h

TARGET=$1
ARCH=$2
SMP=$3
CC=$4

if [ -r ../.version ]; then
  VERSION=`cat ../.version`
else
  VERSION=0
  echo 0 > ../.version
fi

# Generate a temporary compile.h

( echo /\* This file is auto generated, version $VERSION \*/

  echo \#define UTS_MACHINE \"$ARCH\"

  echo -n \#define UTS_VERSION \"\#$VERSION
  if [ -n "$SMP" ] ; then echo -n " SMP"; fi
  echo ' '`date`'"'

  echo \#define LINUX_COMPILE_TIME \"`date +%T`\"
  echo \#define LINUX_COMPILE_BY \"`whoami`\"
  echo \#define LINUX_COMPILE_HOST \"`hostname`\"

  if [ -x /bin/dnsdomainname ]; then
    echo \#define LINUX_COMPILE_DOMAIN \"`dnsdomainname`\"
  elif [ -x /bin/domainname ]; then
    echo \#define LINUX_COMPILE_DOMAIN \"`domainname`\"
  else
    echo \#define LINUX_COMPILE_DOMAIN
  fi

  echo \#define LINUX_COMPILER \"`$CC -v 2>&1 | tail -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
   echo $TARGET was not updated;
   rm -f .tmpcompile
else
   echo $TARGET was updated
   mv -f .tmpcompile $TARGET
fi
rm -f .tmpver.1 .tmpver.2