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/scripts/mkcompile_h

http://github.com/mirrors/linux
Shell | 100 lines | 63 code | 19 blank | 18 comment | 14 complexity | 83f62b5d4768887b91c7bab00a4c18b0 MD5 | raw file
  1#!/bin/sh
  2
  3TARGET=$1
  4ARCH=$2
  5SMP=$3
  6PREEMPT=$4
  7CC=$5
  8
  9vecho() { [ "${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
 17if [ -r $TARGET -a ! -O include/generated/autoconf.h ]; then
 18  vecho "  SKIPPED $TARGET"
 19  exit 0
 20fi
 21
 22# Do not expand names
 23set -f
 24
 25# Fix the language to get consistent output
 26LC_ALL=C
 27export LC_ALL
 28
 29if [ -z "$KBUILD_BUILD_VERSION" ]; then
 30	if [ -r .version ]; then
 31		VERSION=`cat .version`
 32	else
 33		VERSION=0
 34		echo 0 > .version
 35	fi
 36else
 37	VERSION=$KBUILD_BUILD_VERSION
 38fi
 39
 40if [ -z "$KBUILD_BUILD_TIMESTAMP" ]; then
 41	TIMESTAMP=`date`
 42else
 43	TIMESTAMP=$KBUILD_BUILD_TIMESTAMP
 44fi
 45if test -z "$KBUILD_BUILD_USER"; then
 46	LINUX_COMPILE_BY=$(whoami | sed 's/\\/\\\\/')
 47else
 48	LINUX_COMPILE_BY=$KBUILD_BUILD_USER
 49fi
 50if test -z "$KBUILD_BUILD_HOST"; then
 51	LINUX_COMPILE_HOST=`hostname`
 52else
 53	LINUX_COMPILE_HOST=$KBUILD_BUILD_HOST
 54fi
 55
 56UTS_VERSION="#$VERSION"
 57CONFIG_FLAGS=""
 58if [ -n "$SMP" ] ; then CONFIG_FLAGS="SMP"; fi
 59if [ -n "$PREEMPT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"; fi
 60UTS_VERSION="$UTS_VERSION $CONFIG_FLAGS $TIMESTAMP"
 61
 62# Truncate to maximum length
 63
 64UTS_LEN=64
 65UTS_TRUNCATE="cut -b -$UTS_LEN"
 66
 67# Generate a temporary compile.h
 68
 69( echo /\* This file is auto generated, version $VERSION \*/
 70  if [ -n "$CONFIG_FLAGS" ] ; then echo "/* $CONFIG_FLAGS */"; fi
 71
 72  echo \#define UTS_MACHINE \"$ARCH\"
 73
 74  echo \#define UTS_VERSION \"`echo $UTS_VERSION | $UTS_TRUNCATE`\"
 75
 76  echo \#define LINUX_COMPILE_BY \"`echo $LINUX_COMPILE_BY | $UTS_TRUNCATE`\"
 77  echo \#define LINUX_COMPILE_HOST \"`echo $LINUX_COMPILE_HOST | $UTS_TRUNCATE`\"
 78
 79  echo \#define LINUX_COMPILER \"`$CC -v 2>&1 | grep ' version '`\"
 80) > .tmpcompile
 81
 82# Only replace the real compile.h if the new one is different,
 83# in order to preserve the timestamp and avoid unnecessary
 84# recompilations.
 85# We don't consider the file changed if only the date/time changed.
 86# A kernel config change will increase the generation number, thus
 87# causing compile.h to be updated (including date/time) due to the
 88# changed comment in the
 89# first line.
 90
 91if [ -r $TARGET ] && \
 92      grep -v 'UTS_VERSION' $TARGET > .tmpver.1 && \
 93      grep -v 'UTS_VERSION' .tmpcompile > .tmpver.2 && \
 94      cmp -s .tmpver.1 .tmpver.2; then
 95   rm -f .tmpcompile
 96else
 97   vecho "  UPD     $TARGET"
 98   mv -f .tmpcompile $TARGET
 99fi
100rm -f .tmpver.1 .tmpver.2