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1 #! /bin/sh
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2
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3 # Compare stripped copies of two given object files.
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4
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36
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5 # Copyright (C) 2007, 2008, 2009 Free Software Foundation
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6 # Originally by Alexandre Oliva <aoliva@redhat.com>
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7
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8 # This file is part of GCC.
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9
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10 # GCC is free software; you can redistribute it and/or modify it under
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11 # the terms of the GNU General Public License as published by the Free
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12 # Software Foundation; either version 3, or (at your option) any later
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13 # version.
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14
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15 # GCC is distributed in the hope that it will be useful, but WITHOUT
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16 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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17 # or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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18 # License for more details.
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19
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20 # You should have received a copy of the GNU General Public License
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21 # along with GCC; see the file COPYING3. If not see
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22 # <http://www.gnu.org/licenses/>.
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23
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24 rm='rm -f'
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25
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26 case $1 in
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27 -p | --preserve)
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28 rm='echo preserving'
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29 shift
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30 ;;
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31 esac
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32
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33 if test $# != 2; then
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34 echo 'usage: compare-debug file1.o file2.o' >&2
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35 exit 1
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36 fi
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37
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38 if test ! -f "$1"; then
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39 echo "$1" does not exist >&2
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40 exit 1
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41 fi
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42
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43 if test ! -f "$2"; then
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44 echo "$2" does not exist >&2
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45 exit 1
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46 fi
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47
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48 suf1=stripped
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49 while test -f "$1.$suf1"; do
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50 suf1=$suf1.
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51 done
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52
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53 suf2=stripped
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54 while test -f "$2.$suf2"; do
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55 suf2=$suf2.
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56 done
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57
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58 trap 'rm -f "$1.$suf1" "$2.$suf2"' 0 1 2 15
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59
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60 cp "$1" "$1.$suf1"
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61 strip "$1.$suf1"
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62
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63 cp "$2" "$2.$suf2"
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64 strip "$2.$suf2"
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65
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66 if cmp "$1.$suf1" "$2.$suf2"; then
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67 status=0
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68 else
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69 status=1
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36
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70
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71 # Assembler-generated CFI will add an .eh_frame section for -g not
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72 # present in -g0. Try to cope with it by checking that an .eh_frame
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73 # section is present in either object file, and then stripping it
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74 # off before re-comparing.
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75
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76 cmd=
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77 cmp1=
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78 cmp2=
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79
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80 for t in objdump readelf eu-readelf; do
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81 if ($t --help) 2>&1 | grep -e '--\[*section-\]*headers' > /dev/null; then
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82 cmd=$t
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83
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84 $cmd --section-headers "$1.$suf1" | grep '\.eh_frame' > /dev/null
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85 cmp1=$?
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86
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87 $cmd --section-headers "$2.$suf2" | grep '\.eh_frame' > /dev/null
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88 cmp2=$?
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89
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90 break
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91 fi
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92 done
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93
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94 # If we found .eh_frame in one but not the other, or if we could not
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95 # find a command to tell, try to strip off the .eh_frame section
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96 # from both.
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97 if test "x$cmp1" != "x$cmp2" || test "x$cmd" = "x"; then
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98 suf3=$suf1.
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99 while test -f "$1.$suf3"; do
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100 suf3=$suf3.
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101 done
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102
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103 suf4=$suf2.
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104 while test -f "$2.$suf4"; do
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105 suf4=$suf4.
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106 done
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107
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108 trap 'rm -f "$1.$suf1" "$2.$suf2" "$1.$suf3" "$2.$suf4"' 0 1 2 15
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109
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110 echo stripping off .eh_frame, then retrying >&2
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111
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112 if (objcopy -v) 2>&1 | grep -e "--remove-section" > /dev/null; then
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113 objcopy --remove-section .eh_frame --remove-section .rel.eh_frame --remove-section .rela.eh_frame "$1.$suf1" "$1.$suf3"
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114 mv "$1.$suf3" "$1.$suf1"
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115
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116 objcopy --remove-section .eh_frame --remove-section .rel.eh_frame --remove-section .rela.eh_frame "$2.$suf2" "$2.$suf4"
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117 mv "$2.$suf4" "$2.$suf2"
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118 elif (strip --help) 2>&1 | grep -e --remove-section > /dev/null; then
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119 cp "$1.$suf1" "$1.$suf3"
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120 strip --remove-section .eh_frame --remove-section .rel.eh_frame --remove-section .rela.eh_frame "$1.$suf3"
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121 mv "$1.$suf3" "$1.$suf1"
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122
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123 cp "$2.$suf2" "$2.$suf4"
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124 strip --remove-section .eh_frame --remove-section .rel.eh_frame --remove-section .rela.eh_frame "$2.$suf4"
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125 mv "$2.$suf4" "$2.$suf2"
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126 else
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127 echo failed to strip off .eh_frame >&2
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128 fi
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129
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130 trap 'rm -f "$1.$suf1" "$2.$suf2"' 0 1 2 15
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131
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132 if cmp "$1.$suf1" "$2.$suf2"; then
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133 status=0
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134 else
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135 status=1
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136 fi
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137 fi
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0
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138 fi
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139
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140 $rm "$1.$suf1" "$2.$suf2"
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141
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142 trap "exit $status; exit" 0 1 2 15
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143
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144 exit $status
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