scripts/mkcompile_h

   1 #!/bin/sh
   2 # SPDX-License-Identifier: GPL-2.0
   3
   4 TARGET=$1
   5 ARCH=$2
   6 SMP=$3
   7 PREEMPT=$4
   8 CC=$5
   9
  10 vecho() { [ "${quiet}" = "silent_" ] || echo "$@" ; }
  11
  12 # If compile.h exists already and we don't own autoconf.h
  13 # (i.e. we're not the same user who did make *config), don't
  14 # modify compile.h
  15 # So "sudo make install" won't change the "compiled by <user>"
  16 # do "compiled by root"
  17
  18 if [ -r $TARGET -a ! -O include/generated/autoconf.h ]; then
  19   vecho "  SKIPPED $TARGET"
  20   exit 0
  21 fi
  22
  23 # Do not expand names
  24 set -f
  25
  26 # Fix the language to get consistent output
  27 LC_ALL=C
  28 export LC_ALL
  29
  30 if [ -z "$KBUILD_BUILD_VERSION" ]; then
  31         VERSION=$(cat .version 2>/dev/null || echo 1)
  32 else
  33         VERSION=$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 if test -z "$KBUILD_BUILD_USER"; then
  42         LINUX_COMPILE_BY=$(whoami | sed 's/\\/\\\\/')
  43 else
  44         LINUX_COMPILE_BY=$KBUILD_BUILD_USER
  45 fi
  46 if test -z "$KBUILD_BUILD_HOST"; then
  47         LINUX_COMPILE_HOST=`hostname`
  48 else
  49         LINUX_COMPILE_HOST=$KBUILD_BUILD_HOST
  50 fi
  51
  52 UTS_VERSION="#$VERSION"
  53 CONFIG_FLAGS=""
  54 if [ -n "$SMP" ] ; then CONFIG_FLAGS="SMP"; fi
  55 if [ -n "$PREEMPT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"; fi
  56 UTS_VERSION="$UTS_VERSION $CONFIG_FLAGS $TIMESTAMP"
  57
  58 # Truncate to maximum length
  59
  60 UTS_LEN=64
  61 UTS_TRUNCATE="cut -b -$UTS_LEN"
  62
  63 # Generate a temporary compile.h
  64
  65 ( echo /\* This file is auto generated, version $VERSION \*/
  66   if [ -n "$CONFIG_FLAGS" ] ; then echo "/* $CONFIG_FLAGS */"; fi
  67
  68   echo \#define UTS_MACHINE \"$ARCH\"
  69
  70   echo \#define UTS_VERSION \"`echo $UTS_VERSION | $UTS_TRUNCATE`\"
  71
  72   echo \#define LINUX_COMPILE_BY \"`echo $LINUX_COMPILE_BY | $UTS_TRUNCATE`\"
  73   echo \#define LINUX_COMPILE_HOST \"`echo $LINUX_COMPILE_HOST | $UTS_TRUNCATE`\"
  74
  75   echo \#define LINUX_COMPILER \"`$CC -v 2>&1 | grep ' version ' | sed 's/[[:space:]]*$//'`\"
  76 ) > .tmpcompile
  77
  78 # Only replace the real compile.h if the new one is different,
  79 # in order to preserve the timestamp and avoid unnecessary
  80 # recompilations.
  81 # We don't consider the file changed if only the date/time changed.
  82 # A kernel config change will increase the generation number, thus
  83 # causing compile.h to be updated (including date/time) due to the
  84 # changed comment in the
  85 # first line.
  86
  87 if [ -r $TARGET ] && \
  88       grep -v 'UTS_VERSION' $TARGET > .tmpver.1 && \
  89       grep -v 'UTS_VERSION' .tmpcompile > .tmpver.2 && \
  90       cmp -s .tmpver.1 .tmpver.2; then
  91    rm -f .tmpcompile
  92 else
  93    vecho "  UPD     $TARGET"
  94    mv -f .tmpcompile $TARGET
  95 fi
  96 rm -f .tmpver.1 .tmpver.2