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4be63d9e RB |
1 | #! /bin/sh |
2 | ||
3 | # Compare copies of two given object files. | |
4 | ||
5 | # Copyright (C) 2007, 2008, 2009, 2010, 2012 Free Software Foundation | |
6 | # Originally by Alexandre Oliva <aoliva@redhat.com> | |
7 | # Modified for LTO bootstrap by Richard Biener <rguenther@suse.de> | |
8 | ||
9 | # This file is part of GCC. | |
10 | ||
11 | # GCC is free software; you can redistribute it and/or modify it under | |
12 | # the terms of the GNU General Public License as published by the Free | |
13 | # Software Foundation; either version 3, or (at your option) any later | |
14 | # version. | |
15 | ||
16 | # GCC is distributed in the hope that it will be useful, but WITHOUT | |
17 | # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
18 | # or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public | |
19 | # License for more details. | |
20 | ||
21 | # You should have received a copy of the GNU General Public License | |
22 | # along with GCC; see the file COPYING3. If not see | |
23 | # <http://www.gnu.org/licenses/>. | |
24 | ||
25 | rm='rm -f' | |
26 | ||
27 | case $1 in | |
28 | -p | --preserve) | |
29 | rm='echo preserving' | |
30 | shift | |
31 | ;; | |
32 | esac | |
33 | ||
34 | if test $# != 2; then | |
35 | echo 'usage: compare-lto file1.o file2.o' >&2 | |
36 | exit 1 | |
37 | fi | |
38 | ||
39 | if test ! -f "$1"; then | |
40 | echo "$1" does not exist >&2 | |
41 | exit 1 | |
42 | fi | |
43 | ||
44 | if test ! -f "$2"; then | |
45 | echo "$2" does not exist >&2 | |
46 | exit 1 | |
47 | fi | |
48 | ||
49 | suf1=stripped | |
50 | while test -f "$1.$suf1"; do | |
51 | suf1=$suf1. | |
52 | done | |
53 | ||
54 | suf2=stripped | |
55 | while test -f "$2.$suf2"; do | |
56 | suf2=$suf2. | |
57 | done | |
58 | ||
59 | trap 'rm -f "$1.$suf1" "$2.$suf2"' 0 1 2 15 | |
60 | ||
61 | if cmp "$1" "$2"; then | |
62 | status=0 | |
63 | else | |
64 | status=1 | |
65 | ||
66 | cmd= | |
67 | for t in objdump readelf eu-readelf; do | |
68 | if ($t --help) 2>&1 | grep ' --\[*section-\]*headers' > /dev/null; then | |
69 | cmd=$t | |
70 | break | |
71 | fi | |
72 | done | |
73 | ||
74 | # If there are LTO option sections, try to strip them off. | |
75 | if test "x$cmd" = "x" || | |
76 | $cmd --section-headers "$1" | grep '.gnu.lto_.opts' > /dev/null || | |
77 | $cmd --section-headers "$2" | grep '.gnu.lto_.opts' > /dev/null ; then | |
78 | ||
79 | echo stripping off LTO option section, then retrying >&2 | |
80 | ||
81 | seclist=".gnu.lto_.opts" | |
82 | rsopts=`for sec in $seclist; do echo " --remove-section $sec"; done` | |
83 | ||
84 | if (objcopy -v) 2>&1 | grep ' --remove-section' > /dev/null; then | |
85 | objcopy $rsopts "$1" "$1.$suf1" | |
86 | objcopy $rsopts "$2" "$2.$suf2" | |
87 | elif (strip --help) 2>&1 | grep ' --remove-section' > /dev/null; then | |
88 | cp "$1" "$1.$suf1" | |
89 | strip $rsopts "$1.$suf1" | |
90 | ||
91 | cp "$2" "$2.$suf2" | |
92 | strip $rsopts "$2.$suf2" | |
93 | else | |
94 | echo failed to strip off LTO option section >&2 | |
95 | fi | |
96 | ||
97 | trap 'rm -f "$1.$suf1" "$2.$suf2"' 0 1 2 15 | |
98 | ||
99 | if cmp "$1.$suf1" "$2.$suf2"; then | |
100 | status=0 | |
101 | else | |
102 | status=1 | |
103 | fi | |
104 | fi | |
105 | fi | |
106 | ||
107 | $rm "$1.$suf1" "$2.$suf2" | |
108 | ||
109 | trap "exit $status; exit" 0 1 2 15 | |
110 | ||
111 | exit $status |