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#! /bin/sh

# Compare stripped copies of two given object files.

# Copyright (C) 2007, 2008, 2009, 2010 Free Software Foundation

# Originally by Alexandre Oliva 

# This file is part of GCC.

# GCC is free software; you can redistribute it and/or modify it under

# the terms of the GNU General Public License as published by the Free

# Software Foundation; either version 3, or (at your option) any later

# version.

# GCC is distributed in the hope that it will be useful, but WITHOUT

# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY

# or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public

# License for more details.

# You should have received a copy of the GNU General Public License

# along with GCC; see the file COPYING3.  If not see

# .

rm='rm -f'

case $1 in

-p | --preserve)

  rm='echo preserving'

  shift

  ;;

esac

if test $# != 2; then

  echo 'usage: compare-debug file1.o file2.o' >&2

  exit 1

fi

if test ! -f "$1"; then

  echo "$1" does not exist >&2

  exit 1

fi

if test ! -f "$2"; then

  echo "$2" does not exist >&2

  exit 1

fi

suf1=stripped

while test -f "$1.$suf1"; do

  suf1=$suf1.

done

suf2=stripped

while test -f "$2.$suf2"; do

  suf2=$suf2.

done

trap 'rm -f "$1.$suf1" "$2.$suf2"' 0 1 2 15

case `uname -s` in

Darwin)

  # The strip command on darwin does not remove all debug info.

  # Fortunately, we can use ld to do it instead.

  ld -S -r -no_uuid "$1" -o "$1.$suf1"

  ld -S -r -no_uuid "$2" -o "$2.$suf2"

  ;;

*)

  cp "$1" "$1.$suf1"

  strip "$1.$suf1"

  cp "$2" "$2.$suf2"

  strip "$2.$suf2"

  ;;

esac

if cmp "$1.$suf1" "$2.$suf2"; then

  status=0

else

  status=1

  # Assembler-generated CFI will add an .eh_frame section for -g not

  # present in -g0.  Try to cope with it by checking that an .eh_frame

  # section is present in either object file, and then stripping it

  # off before re-comparing.

  cmd=

  cmp1=

  cmp2=

  for t in objdump readelf eu-readelf; do

    if ($t --help) 2>&1 | grep ' --\[*section-\]*headers' > /dev/null; then

      cmd=$t

      $cmd --section-headers "$1.$suf1" | grep '\.eh_frame' > /dev/null

      cmp1=$?

      $cmd --section-headers "$2.$suf2" | grep '\.eh_frame' > /dev/null

      cmp2=$?

      break

    fi

  done

  # If we found .eh_frame in one but not the other, or if we could not

  # find a command to tell, or if there are LTO sections, try to strip

  # off the .eh_frame and LTO sections from both.

  if test "x$cmp1" != "x$cmp2" || test "x$cmd" = "x" ||

     $cmd --section-headers "$1.$suf1" | grep '.gnu.lto_' > /dev/null ||

     $cmd --section-headers "$2.$suf2" | grep '.gnu.lto_' > /dev/null ; then

    suf3=$suf1.

    while test -f "$1.$suf3"; do

      suf3=$suf3.

    done

    suf4=$suf2.

    while test -f "$2.$suf4"; do

      suf4=$suf4.

    done

    trap 'rm -f "$1.$suf1" "$2.$suf2" "$1.$suf3" "$2.$suf4"' 0 1 2 15

    echo stripping off .eh_frame and LTO sections, then retrying >&2

    seclist=".eh_frame .rel.eh_frame .rela.eh_frame"

    if test "x$cmd" != "x"; then

      seclist="$seclist "`{ $cmd --section-headers "$1.$suf1"; $cmd --section-headers "$2.$suf2"; } | sed -n 's,.* \(\.gnu\.lto_[^      ]*\).*,\1,p' | sort -u`

    fi

    rsopts=`for sec in $seclist; do echo " --remove-section $sec"; done`

    if (objcopy -v) 2>&1 | grep ' --remove-section' > /dev/null; then

      objcopy $rsopts "$1.$suf1" "$1.$suf3"

      mv "$1.$suf3" "$1.$suf1"

      objcopy $rsopts "$2.$suf2" "$2.$suf4"

      mv "$2.$suf4" "$2.$suf2"

    elif (strip --help) 2>&1 | grep ' --remove-section' > /dev/null; then

      cp "$1.$suf1" "$1.$suf3"

      strip $rsopts "$1.$suf3"

      mv "$1.$suf3" "$1.$suf1"

      cp "$2.$suf2" "$2.$suf4"

      strip $rsopts "$2.$suf4"

      mv "$2.$suf4" "$2.$suf2"

    else

      echo failed to strip off .eh_frame >&2

    fi

    trap 'rm -f "$1.$suf1" "$2.$suf2"' 0 1 2 15

    if cmp "$1.$suf1" "$2.$suf2"; then

      status=0

    else

      status=1

    fi

  fi

fi

$rm "$1.$suf1" "$2.$suf2"

trap "exit $status; exit" 0 1 2 15

if test -f "$1".gkd || test -f "$2".gkd; then

  if cmp "$1".gkd "$2".gkd; then

    :

  else

    status=$?

  fi

fi

exit $status