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131
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1 #! /bin/sh
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2
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3 # Compare copies of two given object files.
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4
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5 # Copyright (C) 2007, 2008, 2009, 2010, 2012 Free Software Foundation
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6 # Originally by Alexandre Oliva <aoliva@redhat.com>
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7 # Modified for LTO bootstrap by Richard Biener <rguenther@suse.de>
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8
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9 # This file is part of GCC.
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10
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11 # GCC is free software; you can redistribute it and/or modify it under
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12 # the terms of the GNU General Public License as published by the Free
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13 # Software Foundation; either version 3, or (at your option) any later
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14 # version.
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15
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16 # GCC is distributed in the hope that it will be useful, but WITHOUT
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17 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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18 # or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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19 # License for more details.
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20
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21 # You should have received a copy of the GNU General Public License
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22 # along with GCC; see the file COPYING3. If not see
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23 # <http://www.gnu.org/licenses/>.
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24
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25 rm='rm -f'
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26
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27 case $1 in
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28 -p | --preserve)
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29 rm='echo preserving'
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30 shift
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31 ;;
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32 esac
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33
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34 if test $# != 2; then
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35 echo 'usage: compare-lto file1.o file2.o' >&2
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36 exit 1
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37 fi
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38
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39 if test ! -f "$1"; then
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40 echo "$1" does not exist >&2
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41 exit 1
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42 fi
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43
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44 if test ! -f "$2"; then
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45 echo "$2" does not exist >&2
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46 exit 1
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47 fi
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48
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49 suf1=stripped
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50 while test -f "$1.$suf1"; do
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51 suf1=$suf1.
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52 done
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53
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54 suf2=stripped
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55 while test -f "$2.$suf2"; do
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56 suf2=$suf2.
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57 done
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58
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59 trap 'rm -f "$1.$suf1" "$2.$suf2"' 0 1 2 15
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60
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61 if cmp "$1" "$2"; then
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62 status=0
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63 else
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64 status=1
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65
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66 cmd=
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67 for t in objdump readelf eu-readelf; do
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68 if ($t --help) 2>&1 | grep ' --\[*section-\]*headers' > /dev/null; then
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69 cmd=$t
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70 break
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71 fi
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72 done
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73
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74 # If there are LTO option sections, try to strip them off.
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75 if test "x$cmd" = "x" ||
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76 $cmd --section-headers "$1" | grep '.gnu.lto_.opts' > /dev/null ||
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77 $cmd --section-headers "$2" | grep '.gnu.lto_.opts' > /dev/null ; then
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78
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79 echo stripping off LTO option section, then retrying >&2
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80
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81 seclist=".gnu.lto_.opts"
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82 rsopts=`for sec in $seclist; do echo " --remove-section $sec"; done`
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83
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84 if (objcopy -v) 2>&1 | grep ' --remove-section' > /dev/null; then
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85 objcopy $rsopts "$1" "$1.$suf1"
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86 objcopy $rsopts "$2" "$2.$suf2"
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87 elif (strip --help) 2>&1 | grep ' --remove-section' > /dev/null; then
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88 cp "$1" "$1.$suf1"
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89 strip $rsopts "$1.$suf1"
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90
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91 cp "$2" "$2.$suf2"
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92 strip $rsopts "$2.$suf2"
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93 else
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94 echo failed to strip off LTO option section >&2
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95 fi
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96
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97 trap 'rm -f "$1.$suf1" "$2.$suf2"' 0 1 2 15
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98
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99 if cmp "$1.$suf1" "$2.$suf2"; then
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100 status=0
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101 else
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102 status=1
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103 fi
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104 fi
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105 fi
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106
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107 $rm "$1.$suf1" "$2.$suf2"
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108
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109 trap "exit $status; exit" 0 1 2 15
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110
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111 exit $status
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