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=$KBUILD_BUILD_TIMESTAMP
  44 fi
  45 if test -z "$KBUILD_BUILD_USER"; then
  46         LINUX_COMPILE_BY=$(whoami | sed 's/\\/\\\\/')
  47 else
  48         LINUX_COMPILE_BY=$KBUILD_BUILD_USER
  49 fi
  50 if test -z "$KBUILD_BUILD_HOST"; then
  51         LINUX_COMPILE_HOST=`hostname`
  52 else
  53         LINUX_COMPILE_HOST=$KBUILD_BUILD_HOST
  54 fi
  55
  56 UTS_VERSION="#$VERSION"
  57 CONFIG_FLAGS=""
  58 if [ -n "$SMP" ] ; then CONFIG_FLAGS="SMP"; fi
  59 if [ -n "$PREEMPT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"; fi
  60 UTS_VERSION="$UTS_VERSION $CONFIG_FLAGS $TIMESTAMP"
  61
  62 # Truncate to maximum length
  63
  64 UTS_LEN=64
  65 UTS_TRUNCATE="cut -b -$UTS_LEN"
  66
  67 # Generate a temporary compile.h
  68
  69 ( echo /\* This file is auto generated, version $VERSION \*/
  70   if [ -n "$CONFIG_FLAGS" ] ; then echo "/* $CONFIG_FLAGS */"; fi
  71
  72   echo \#define UTS_MACHINE \"$ARCH\"
  73
  74   echo \#define UTS_VERSION \"`echo $UTS_VERSION | $UTS_TRUNCATE`\"
  75
  76   echo \#define LINUX_COMPILE_BY \"`echo $LINUX_COMPILE_BY | $UTS_TRUNCATE`\"
  77   echo \#define LINUX_COMPILE_HOST \"`echo $LINUX_COMPILE_HOST | $UTS_TRUNCATE`\"
  78
  79   echo \#define LINUX_COMPILER \"`$CC -v 2>&1 | tail -n 1`\"
  80 ) > .tmpcompile
  81
  82 # Only replace the real compile.h if the new one is different,
  83 # in order to preserve the timestamp and avoid unnecessary
  84 # recompilations.
  85 # We don't consider the file changed if only the date/time changed.
  86 # A kernel config change will increase the generation number, thus
  87 # causing compile.h to be updated (including date/time) due to the
  88 # changed comment in the
  89 # first line.
  90
  91 if [ -r $TARGET ] && \
  92       grep -v 'UTS_VERSION' $TARGET > .tmpver.1 && \
  93       grep -v 'UTS_VERSION' .tmpcompile > .tmpver.2 && \
  94       cmp -s .tmpver.1 .tmpver.2; then
  95    rm -f .tmpcompile
  96 else
  97    vecho "  UPD     $TARGET"
  98    mv -f .tmpcompile $TARGET
  99 fi
 100 rm -f .tmpver.1 .tmpver.2