scripts/mkcompile_h

   1 TARGET=$1
   2 ARCH=$2
   3 SMP=$3
   4 PREEMPT=$4
   5 CC=$5
   6
   7 vecho() { [ "${quiet}" = "silent_" ] || echo "$@" ; }
   8
   9 # If compile.h exists already and we don't own autoconf.h
  10 # (i.e. we're not the same user who did make *config), don't
  11 # modify compile.h
  12 # So "sudo make install" won't change the "compiled by <user>"
  13 # do "compiled by root"
  14
  15 if [ -r $TARGET -a ! -O include/linux/autoconf.h ]; then
  16   vecho "  SKIPPED $TARGET"
  17   exit 0
  18 fi
  19
  20 # Do not expand names
  21 set -f
  22
  23 # Fix the language to get consistent output
  24 LC_ALL=C
  25 export LC_ALL
  26
  27 if [ -z "$KBUILD_BUILD_VERSION" ]; then
  28         if [ -r .version ]; then
  29                 VERSION=`cat .version`
  30         else
  31                 VERSION=0
  32                 echo 0 > .version
  33         fi
  34 else
  35         VERSION=$KBUILD_BUILD_VERSION
  36 fi
  37
  38 if [ -z "$KBUILD_BUILD_TIMESTAMP" ]; then
  39         TIMESTAMP=`date`
  40 else
  41         TIMESTAMP=$KBUILD_BUILD_TIMESTAMP
  42 fi
  43
  44 UTS_VERSION="#$VERSION"
  45 CONFIG_FLAGS=""
  46 if [ -n "$SMP" ] ; then CONFIG_FLAGS="SMP"; fi
  47 if [ -n "$PREEMPT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"; fi
  48 UTS_VERSION="$UTS_VERSION $CONFIG_FLAGS $TIMESTAMP"
  49
  50 # Truncate to maximum length
  51
  52 UTS_LEN=64
  53 UTS_TRUNCATE="sed -e s/\(.\{1,$UTS_LEN\}\).*/\1/"
  54
  55 # Generate a temporary compile.h
  56
  57 ( echo /\* This file is auto generated, version $VERSION \*/
  58   if [ -n "$CONFIG_FLAGS" ] ; then echo "/* $CONFIG_FLAGS */"; fi
  59
  60   echo \#define UTS_MACHINE \"$ARCH\"
  61
  62   echo \#define UTS_VERSION \"`echo $UTS_VERSION | $UTS_TRUNCATE`\"
  63
  64   echo \#define LINUX_COMPILE_TIME \"`date +%T`\"
  65   echo \#define LINUX_COMPILE_BY \"`whoami`\"
  66   echo \#define LINUX_COMPILE_HOST \"`hostname | $UTS_TRUNCATE`\"
  67
  68   if [ -x /bin/dnsdomainname ]; then
  69     echo \#define LINUX_COMPILE_DOMAIN \"`dnsdomainname | $UTS_TRUNCATE`\"
  70   elif [ -x /bin/domainname ]; then
  71     echo \#define LINUX_COMPILE_DOMAIN \"`domainname | $UTS_TRUNCATE`\"
  72   else
  73     echo \#define LINUX_COMPILE_DOMAIN
  74   fi
  75
  76   echo \#define LINUX_COMPILER \"`$CC -v 2>&1 | tail -n 1`\"
  77 ) > .tmpcompile
  78
  79 # Only replace the real compile.h if the new one is different,
  80 # in order to preserve the timestamp and avoid unnecessary
  81 # recompilations.
  82 # We don't consider the file changed if only the date/time changed.
  83 # A kernel config change will increase the generation number, thus
  84 # causing compile.h to be updated (including date/time) due to the
  85 # changed comment in the
  86 # first line.
  87
  88 if [ -r $TARGET ] && \
  89       grep -v 'UTS_VERSION\|LINUX_COMPILE_TIME' $TARGET > .tmpver.1 && \
  90       grep -v 'UTS_VERSION\|LINUX_COMPILE_TIME' .tmpcompile > .tmpver.2 && \
  91       cmp -s .tmpver.1 .tmpver.2; then
  92    rm -f .tmpcompile
  93 else
  94    vecho "  UPD     $TARGET"
  95    mv -f .tmpcompile $TARGET
  96 fi
  97 rm -f .tmpver.1 .tmpver.2