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=$6
  10
  11 vecho() { [ "${quiet}" = "silent_" ] || echo "$@" ; }
  12
  13 # If compile.h exists already and we don't own autoconf.h
  14 # (i.e. we're not the same user who did make *config), don't
  15 # modify compile.h
  16 # So "sudo make install" won't change the "compiled by <user>"
  17 # do "compiled by root"
  18
  19 if [ -r $TARGET -a ! -O include/generated/autoconf.h ]; then
  20   vecho "  SKIPPED $TARGET"
  21   exit 0
  22 fi
  23
  24 # Do not expand names
  25 set -f
  26
  27 # Fix the language to get consistent output
  28 LC_ALL=C
  29 export LC_ALL
  30
  31 if [ -z "$KBUILD_BUILD_VERSION" ]; then
  32         VERSION=$(cat .version 2>/dev/null || echo 1)
  33 else
  34         VERSION=$KBUILD_BUILD_VERSION
  35 fi
  36
  37 if [ -z "$KBUILD_BUILD_TIMESTAMP" ]; then
  38         TIMESTAMP=`date`
  39 else
  40         TIMESTAMP=$KBUILD_BUILD_TIMESTAMP
  41 fi
  42 if test -z "$KBUILD_BUILD_USER"; then
  43         LINUX_COMPILE_BY=$(whoami | sed 's/\\/\\\\/')
  44 else
  45         LINUX_COMPILE_BY=$KBUILD_BUILD_USER
  46 fi
  47 if test -z "$KBUILD_BUILD_HOST"; then
  48         LINUX_COMPILE_HOST=`hostname`
  49 else
  50         LINUX_COMPILE_HOST=$KBUILD_BUILD_HOST
  51 fi
  52
  53 UTS_VERSION="#$VERSION"
  54 CONFIG_FLAGS=""
  55 if [ -n "$SMP" ] ; then CONFIG_FLAGS="SMP"; fi
  56 if [ -n "$PREEMPT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"; fi
  57 if [ -n "$PREEMPT_RT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT_RT"; fi
  58
  59 # Truncate to maximum length
  60 UTS_LEN=64
  61 UTS_VERSION="$(echo $UTS_VERSION $CONFIG_FLAGS $TIMESTAMP | cut -b -$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 \"$UTS_VERSION\"
  71
  72   printf '#define LINUX_COMPILE_BY "%s"\n' "$LINUX_COMPILE_BY"
  73   echo \#define LINUX_COMPILE_HOST \"$LINUX_COMPILE_HOST\"
  74
  75   echo \#define LINUX_COMPILER \"`$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