xref: /netbsd-src/external/gpl3/gcc.old/dist/contrib/compare-debug (revision b7b7574d3bf8eeb51a1fa3977b59142ec6434a55)
1#! /bin/sh
2
3# Compare stripped copies of two given object files.
4
5# Copyright (C) 2007, 2008, 2009 Free Software Foundation
6# Originally by Alexandre Oliva <aoliva@redhat.com>
7
8# This file is part of GCC.
9
10# GCC is free software; you can redistribute it and/or modify it under
11# the terms of the GNU General Public License as published by the Free
12# Software Foundation; either version 3, or (at your option) any later
13# version.
14
15# GCC is distributed in the hope that it will be useful, but WITHOUT
16# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
17# or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
18# License for more details.
19
20# You should have received a copy of the GNU General Public License
21# along with GCC; see the file COPYING3.  If not see
22# <http://www.gnu.org/licenses/>.
23
24rm='rm -f'
25
26case $1 in
27-p | --preserve)
28  rm='echo preserving'
29  shift
30  ;;
31esac
32
33if test $# != 2; then
34  echo 'usage: compare-debug file1.o file2.o' >&2
35  exit 1
36fi
37
38if test ! -f "$1"; then
39  echo "$1" does not exist >&2
40  exit 1
41fi
42
43if test ! -f "$2"; then
44  echo "$2" does not exist >&2
45  exit 1
46fi
47
48suf1=stripped
49while test -f "$1.$suf1"; do
50  suf1=$suf1.
51done
52
53suf2=stripped
54while test -f "$2.$suf2"; do
55  suf2=$suf2.
56done
57
58trap 'rm -f "$1.$suf1" "$2.$suf2"' 0 1 2 15
59
60case `uname -s` in
61Darwin)
62  # The strip command on darwin does not remove all debug info.
63  # Fortunately, we can use ld to do it instead.
64  ld -S -r -no_uuid "$1" -o "$1.$suf1"
65  ld -S -r -no_uuid "$2" -o "$2.$suf2"
66  ;;
67*)
68  cp "$1" "$1.$suf1"
69  strip "$1.$suf1"
70
71  cp "$2" "$2.$suf2"
72  strip "$2.$suf2"
73  ;;
74esac
75
76if cmp "$1.$suf1" "$2.$suf2"; then
77  status=0
78else
79  status=1
80
81  # Assembler-generated CFI will add an .eh_frame section for -g not
82  # present in -g0.  Try to cope with it by checking that an .eh_frame
83  # section is present in either object file, and then stripping it
84  # off before re-comparing.
85
86  cmd=
87  cmp1=
88  cmp2=
89
90  for t in objdump readelf eu-readelf; do
91    if ($t --help) 2>&1 | grep ' --\[*section-\]*headers' > /dev/null; then
92      cmd=$t
93
94      $cmd --section-headers "$1.$suf1" | grep '\.eh_frame' > /dev/null
95      cmp1=$?
96
97      $cmd --section-headers "$2.$suf2" | grep '\.eh_frame' > /dev/null
98      cmp2=$?
99
100      break
101    fi
102  done
103
104  # If we found .eh_frame in one but not the other, or if we could not
105  # find a command to tell, try to strip off the .eh_frame section
106  # from both.
107  if test "x$cmp1" != "x$cmp2" || test "x$cmd" = "x"; then
108    suf3=$suf1.
109    while test -f "$1.$suf3"; do
110      suf3=$suf3.
111    done
112
113    suf4=$suf2.
114    while test -f "$2.$suf4"; do
115      suf4=$suf4.
116    done
117
118    trap 'rm -f "$1.$suf1" "$2.$suf2" "$1.$suf3" "$2.$suf4"' 0 1 2 15
119
120    echo stripping off .eh_frame, then retrying >&2
121
122    if (objcopy -v) 2>&1 | grep ' --remove-section' > /dev/null; then
123      objcopy --remove-section .eh_frame --remove-section .rel.eh_frame --remove-section .rela.eh_frame "$1.$suf1" "$1.$suf3"
124      mv "$1.$suf3" "$1.$suf1"
125
126      objcopy --remove-section .eh_frame --remove-section .rel.eh_frame --remove-section .rela.eh_frame "$2.$suf2" "$2.$suf4"
127      mv "$2.$suf4" "$2.$suf2"
128    elif (strip --help) 2>&1 | grep ' --remove-section' > /dev/null; then
129      cp "$1.$suf1" "$1.$suf3"
130      strip --remove-section .eh_frame --remove-section .rel.eh_frame --remove-section .rela.eh_frame "$1.$suf3"
131      mv "$1.$suf3" "$1.$suf1"
132
133      cp "$2.$suf2" "$2.$suf4"
134      strip --remove-section .eh_frame --remove-section .rel.eh_frame --remove-section .rela.eh_frame "$2.$suf4"
135      mv "$2.$suf4" "$2.$suf2"
136    else
137      echo failed to strip off .eh_frame >&2
138    fi
139
140    trap 'rm -f "$1.$suf1" "$2.$suf2"' 0 1 2 15
141
142    if cmp "$1.$suf1" "$2.$suf2"; then
143      status=0
144    else
145      status=1
146    fi
147  fi
148fi
149
150$rm "$1.$suf1" "$2.$suf2"
151
152trap "exit $status; exit" 0 1 2 15
153
154if test -f "$1".gkd || test -f "$2".gkd; then
155  if cmp "$1".gkd "$2".gkd; then
156    :
157  else
158    status=$?
159  fi
160fi
161
162exit $status
163