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 $TARGET"
  15   exit 0
  16 fi
  17
  18 # Do not expand names
  19 set -f
  20
  21 # Fix the language to get consistent output
  22 LC_ALL=C
  23 export LC_ALL
  24
  25 if [ -z "$KBUILD_BUILD_VERSION" ]; then
  26         if [ -r .version ]; then
  27                 VERSION=`cat .version`
  28         else
  29                 VERSION=0
  30                 echo 0 > .version
  31         fi
  32 else
  33         VERSION=$KBUILD_BUILD_VERSION
  34 fi
  35
  36 if [ -z "$KBUILD_BUILD_TIMESTAMP" ]; then
  37         TIMESTAMP=`date`
  38 else
  39         TIMESTAMP=$KBUILD_BUILD_TIMESTAMP
  40 fi
  41
  42 UTS_VERSION="#$VERSION"
  43 CONFIG_FLAGS=""
  44 if [ -n "$SMP" ] ; then CONFIG_FLAGS="SMP"; fi
  45 if [ -n "$PREEMPT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"; fi
  46 UTS_VERSION="$UTS_VERSION $CONFIG_FLAGS $TIMESTAMP"
  47
  48 # Truncate to maximum length
  49
  50 UTS_LEN=64
  51 UTS_TRUNCATE="sed -e s/\(.\{1,$UTS_LEN\}\).*/\1/"
  52
  53 # Generate a temporary compile.h
  54
  55 ( echo /\* This file is auto generated, version $VERSION \*/
  56   if [ -n "$CONFIG_FLAGS" ] ; then echo "/* $CONFIG_FLAGS */"; fi
  57
  58   echo \#define UTS_MACHINE \"$ARCH\"
  59
  60   echo \#define UTS_VERSION \"`echo $UTS_VERSION | $UTS_TRUNCATE`\"
  61
  62   echo \#define LINUX_COMPILE_TIME \"`date +%T`\"
  63   echo \#define LINUX_COMPILE_BY \"`whoami`\"
  64   echo \#define LINUX_COMPILE_HOST \"`hostname | $UTS_TRUNCATE`\"
  65
  66   if [ -x /bin/dnsdomainname ]; then
  67     echo \#define LINUX_COMPILE_DOMAIN \"`dnsdomainname | $UTS_TRUNCATE`\"
  68   elif [ -x /bin/domainname ]; then
  69     echo \#define LINUX_COMPILE_DOMAIN \"`domainname | $UTS_TRUNCATE`\"
  70   else
  71     echo \#define LINUX_COMPILE_DOMAIN
  72   fi
  73
  74   echo \#define LINUX_COMPILER \"`$CC -v 2>&1 | tail -n 1`\"
  75 ) > .tmpcompile
  76
  77 # Only replace the real compile.h if the new one is different,
  78 # in order to preserve the timestamp and avoid unnecessary
  79 # recompilations.
  80 # We don't consider the file changed if only the date/time changed.
  81 # A kernel config change will increase the generation number, thus
  82 # causing compile.h to be updated (including date/time) due to the
  83 # changed comment in the
  84 # first line.
  85
  86 if [ -r $TARGET ] && \
  87       grep -v 'UTS_VERSION\|LINUX_COMPILE_TIME' $TARGET > .tmpver.1 && \
  88       grep -v 'UTS_VERSION\|LINUX_COMPILE_TIME' .tmpcompile > .tmpver.2 && \
  89       cmp -s .tmpver.1 .tmpver.2; then
  90    rm -f .tmpcompile
  91 else
  92    echo "  UPD     $TARGET"
  93    mv -f .tmpcompile $TARGET
  94 fi
  95 rm -f .tmpver.1 .tmpver.2