scripts/mkcompile_h

   1 TARGET=$1
   2 ARCH=$2
   3 SMP=$3
   4 PREEMPT=$4
   5 CC=$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
  13 if [ -r $TARGET -a ! -O include/linux/autoconf.h ]; then
  14   echo "  SKIPPED $TARGET"
  15   exit 0
  16 fi
  17
  18 # Do not expand names
  19 set -f
  20
  21 if [ -r .version ]; then
  22   VERSION=`cat .version`
  23 else
  24   VERSION=0
  25   echo 0 > .version
  26 fi
  27
  28
  29 UTS_VERSION="#$VERSION"
  30 CONFIG_FLAGS=""
  31 if [ -n "$SMP" ] ; then CONFIG_FLAGS="SMP"; fi
  32 if [ -n "$PREEMPT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"; fi
  33 UTS_VERSION="$UTS_VERSION $CONFIG_FLAGS `LC_ALL=C LANG=C date`"
  34
  35 # Truncate to maximum length
  36
  37 UTS_LEN=64
  38 UTS_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
  73 if [ -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
  78 else
  79    echo "  UPD     $TARGET"
  80    mv -f .tmpcompile $TARGET
  81 fi
  82 rm -f .tmpver.1 .tmpver.2