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         VERSION=$(cat .version 2>/dev/null || echo 1)
  31 else
  32         VERSION=$KBUILD_BUILD_VERSION
  33 fi
  34
  35 if [ -z "$KBUILD_BUILD_TIMESTAMP" ]; then
  36         TIMESTAMP=`date`
  37 else
  38         TIMESTAMP=$KBUILD_BUILD_TIMESTAMP
  39 fi
  40 if test -z "$KBUILD_BUILD_USER"; then
  41         LINUX_COMPILE_BY=$(whoami | sed 's/\\/\\\\/')
  42 else
  43         LINUX_COMPILE_BY=$KBUILD_BUILD_USER
  44 fi
  45 if test -z "$KBUILD_BUILD_HOST"; then
  46         LINUX_COMPILE_HOST=`hostname`
  47 else
  48         LINUX_COMPILE_HOST=$KBUILD_BUILD_HOST
  49 fi
  50
  51 UTS_VERSION="#$VERSION"
  52 CONFIG_FLAGS=""
  53 if [ -n "$SMP" ] ; then CONFIG_FLAGS="SMP"; fi
  54 if [ -n "$PREEMPT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"; fi
  55 UTS_VERSION="$UTS_VERSION $CONFIG_FLAGS $TIMESTAMP"
  56
  57 # Truncate to maximum length
  58
  59 UTS_LEN=64
  60 UTS_TRUNCATE="cut -b -$UTS_LEN"
  61
  62 # Generate a temporary compile.h
  63
  64 ( echo /\* This file is auto generated, version $VERSION \*/
  65   if [ -n "$CONFIG_FLAGS" ] ; then echo "/* $CONFIG_FLAGS */"; fi
  66
  67   echo \#define UTS_MACHINE \"$ARCH\"
  68
  69   echo \#define UTS_VERSION \"`echo $UTS_VERSION | $UTS_TRUNCATE`\"
  70
  71   echo \#define LINUX_COMPILE_BY \"`echo $LINUX_COMPILE_BY | $UTS_TRUNCATE`\"
  72   echo \#define LINUX_COMPILE_HOST \"`echo $LINUX_COMPILE_HOST | $UTS_TRUNCATE`\"
  73
  74   echo \#define LINUX_COMPILER \"`$CC -v 2>&1 | grep ' version ' | sed 's/[[:space:]]*$//'`\"
  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' $TARGET > .tmpver.1 && \
  88       grep -v 'UTS_VERSION' .tmpcompile > .tmpver.2 && \
  89       cmp -s .tmpver.1 .tmpver.2; then
  90    rm -f .tmpcompile
  91 else
  92    vecho "  UPD     $TARGET"
  93    mv -f .tmpcompile $TARGET
  94 fi
  95 rm -f .tmpver.1 .tmpver.2