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 PREEMPT_RT=$5
   9 CC=$6
  10 LD=$7
  11
  12 vecho() { [ "${quiet}" = "silent_" ] || echo "$@" ; }
  13
  14 # Do not expand names
  15 set -f
  16
  17 # Fix the language to get consistent output
  18 LC_ALL=C
  19 export LC_ALL
  20
  21 if [ -z "$KBUILD_BUILD_VERSION" ]; then
  22         VERSION=$(cat .version 2>/dev/null || echo 1)
  23 else
  24         VERSION=$KBUILD_BUILD_VERSION
  25 fi
  26
  27 if [ -z "$KBUILD_BUILD_TIMESTAMP" ]; then
  28         TIMESTAMP=`date`
  29 else
  30         TIMESTAMP=$KBUILD_BUILD_TIMESTAMP
  31 fi
  32 if test -z "$KBUILD_BUILD_USER"; then
  33         LINUX_COMPILE_BY=$(whoami | sed 's/\\/\\\\/')
  34 else
  35         LINUX_COMPILE_BY=$KBUILD_BUILD_USER
  36 fi
  37 if test -z "$KBUILD_BUILD_HOST"; then
  38         LINUX_COMPILE_HOST=`hostname`
  39 else
  40         LINUX_COMPILE_HOST=$KBUILD_BUILD_HOST
  41 fi
  42
  43 UTS_VERSION="#$VERSION"
  44 CONFIG_FLAGS=""
  45 if [ -n "$SMP" ] ; then CONFIG_FLAGS="SMP"; fi
  46 if [ -n "$PREEMPT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"; fi
  47 if [ -n "$PREEMPT_RT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT_RT"; fi
  48
  49 # Truncate to maximum length
  50 UTS_LEN=64
  51 UTS_VERSION="$(echo $UTS_VERSION $CONFIG_FLAGS $TIMESTAMP | cut -b -$UTS_LEN)"
  52
  53 # Generate a temporary compile.h
  54
  55 { echo /\* This file is auto generated, version $VERSION \*/
  56   if [ -n "$CONFIG_FLAGS" ] ; then echo "/* $CONFIG_FLAGS */"; fi
  57
  58   echo \#define UTS_MACHINE \"$ARCH\"
  59
  60   echo \#define UTS_VERSION \"$UTS_VERSION\"
  61
  62   printf '#define LINUX_COMPILE_BY "%s"\n' "$LINUX_COMPILE_BY"
  63   echo \#define LINUX_COMPILE_HOST \"$LINUX_COMPILE_HOST\"
  64
  65   CC_VERSION=$($CC -v 2>&1 | grep ' version ' | sed 's/[[:space:]]*$//')
  66   LD_VERSION=$($LD -v | head -n1 | sed 's/(compatible with [^)]*)//' \
  67                       | sed 's/[[:space:]]*$//')
  68   printf '#define LINUX_COMPILER "%s"\n' "$CC_VERSION, $LD_VERSION"
  69 } > .tmpcompile
  70
  71 # Only replace the real compile.h if the new one is different,
  72 # in order to preserve the timestamp and avoid unnecessary
  73 # recompilations.
  74 # We don't consider the file changed if only the date/time changed.
  75 # A kernel config change will increase the generation number, thus
  76 # causing compile.h to be updated (including date/time) due to the
  77 # changed comment in the
  78 # first line.
  79
  80 if [ -r $TARGET ] && \
  81       grep -v 'UTS_VERSION' $TARGET > .tmpver.1 && \
  82       grep -v 'UTS_VERSION' .tmpcompile > .tmpver.2 && \
  83       cmp -s .tmpver.1 .tmpver.2; then
  84    rm -f .tmpcompile
  85 else
  86    vecho "  UPD     $TARGET"
  87    mv -f .tmpcompile $TARGET
  88 fi
  89 rm -f .tmpver.1 .tmpver.2