scripts/mkcompile_h

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