LXR linux/scripts/mkcompile

   1#!/bin/sh
   2# SPDX-License-Identifier: GPL-2.0
   3
   4TARGET=$1
   5ARCH=$2
   6SMP=$3
   7PREEMPT=$4
   8CC=$5
   9
  10vecho() { [ "${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
  18if [ -r $TARGET -a ! -O include/generated/autoconf.h ]; then
  19  vecho "  SKIPPED $TARGET"
  20  exit 0
  21fi
  22
  23# Do not expand names
  24set -f
  25
  26# Fix the language to get consistent output
  27LC_ALL=C
  28export LC_ALL
  29
  30if [ -z "$KBUILD_BUILD_VERSION" ]; then
  31        if [ -r .version ]; then
  32                VERSION=`cat .version`
  33        else
  34                VERSION=0
  35                echo 0 > .version
  36        fi
  37else
  38        VERSION=$KBUILD_BUILD_VERSION
  39fi
  40
  41if [ -z "$KBUILD_BUILD_TIMESTAMP" ]; then
  42        TIMESTAMP=`date`
  43else
  44        TIMESTAMP=$KBUILD_BUILD_TIMESTAMP
  45fi
  46if test -z "$KBUILD_BUILD_USER"; then
  47        LINUX_COMPILE_BY=$(whoami | sed 's/\\/\\\\/')
  48else
  49        LINUX_COMPILE_BY=$KBUILD_BUILD_USER
  50fi
  51if test -z "$KBUILD_BUILD_HOST"; then
  52        LINUX_COMPILE_HOST=`hostname`
  53else
  54        LINUX_COMPILE_HOST=$KBUILD_BUILD_HOST
  55fi
  56
  57UTS_VERSION="#$VERSION"
  58CONFIG_FLAGS=""
  59if [ -n "$SMP" ] ; then CONFIG_FLAGS="SMP"; fi
  60if [ -n "$PREEMPT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"; fi
  61UTS_VERSION="$UTS_VERSION $CONFIG_FLAGS $TIMESTAMP"
  62
  63# Truncate to maximum length
  64
  65UTS_LEN=64
  66UTS_TRUNCATE="cut -b -$UTS_LEN"
  67
  68# Generate a temporary compile.h
  69
  70( echo /\* This file is auto generated, version $VERSION \*/
  71  if [ -n "$CONFIG_FLAGS" ] ; then echo "/* $CONFIG_FLAGS */"; fi
  72
  73  echo \#define UTS_MACHINE \"$ARCH\"
  74
  75  echo \#define UTS_VERSION \"`echo $UTS_VERSION | $UTS_TRUNCATE`\"
  76
  77  echo \#define LINUX_COMPILE_BY \"`echo $LINUX_COMPILE_BY | $UTS_TRUNCATE`\"
  78  echo \#define LINUX_COMPILE_HOST \"`echo $LINUX_COMPILE_HOST | $UTS_TRUNCATE`\"
  79
  80  echo \#define LINUX_COMPILER \"`$CC -v 2>&1 | grep ' version ' | sed 's/[[:space:]]*$//'`\"
  81) > .tmpcompile
  82
  83# Only replace the real compile.h if the new one is different,
  84# in order to preserve the timestamp and avoid unnecessary
  85# recompilations.
  86# We don't consider the file changed if only the date/time changed.
  87# A kernel config change will increase the generation number, thus
  88# causing compile.h to be updated (including date/time) due to the
  89# changed comment in the
  90# first line.
  91
  92if [ -r $TARGET ] && \
  93      grep -v 'UTS_VERSION' $TARGET > .tmpver.1 && \
  94      grep -v 'UTS_VERSION' .tmpcompile > .tmpver.2 && \
  95      cmp -s .tmpver.1 .tmpver.2; then
  96   rm -f .tmpcompile
  97else
  98   vecho "  UPD     $TARGET"
  99   mv -f .tmpcompile $TARGET
 100fi
 101rm -f .tmpver.1 .tmpver.2
 102