1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
|
-*- mode: Outline -*-
This is version 0.99 of the unwind library. This library supports
several architecture/operating-system combinations:
Linux/IA-64: Fully tested and supported.
Linux/x86-64: Works well.
Linux/x86: Works well, but C library is missing some unwind-info.
Linux/PARISC: Works well, but C library missing unwind-info.
HP-UX/IA-64: Mostly works but known to have some serious limitations.
Linux/PPC64: Newly added.
* General Build Instructions
In general, this library can be built and installed with the following
commands:
$ autoreconf -i # Needed only for building from git. Depends on libtool.
$ ./configure
$ make
$ make install prefix=PREFIX
where PREFIX is the installation prefix. By default, a prefix of
/usr/local is used, such that libunwind.a is installed in
/usr/local/lib and unwind.h is installed in /usr/local/include. For
testing, you may want to use a prefix of /usr/local instead.
* Building with Intel compiler
** Version 8 and later
Starting with version 8, the preferred name for the IA-64 Intel
compiler is "icc" (same name as on x86). Thus, the configure-line
should look like this:
$ ./configure CC=icc CFLAGS="-g -O3 -ip" CXX=icc CCAS=gcc CCASFLAGS=-g \
LDFLAGS="-L$PWD/src/.libs"
* Building on HP-UX
For the time being, libunwind must be built with GCC on HP-UX.
libunwind should be configured and installed on HP-UX like this:
$ ./configure CFLAGS="-g -O2 -mlp64" CXXFLAGS="-g -O2 -mlp64"
Caveat: Unwinding of 32-bit (ILP32) binaries is not supported
at the moment.
** Workaround for older versions of GCC
GCC v3.0 and GCC v3.2 ship with a bad version of sys/types.h. The
workaround is to issue the following commands before running
"configure":
$ mkdir $top_dir/include/sys
$ cp /usr/include/sys/types.h $top_dir/include/sys
GCC v3.3.2 or later have been fixed and do not require this
workaround.
* Building for PowerPC64 / Linux
For building for power64 you should use:
$ ./configure CFLAGS="-g -O2 -m64" CXXFLAGS="-g -O2 -m64"
If your power support altivec registers:
$ ./configure CFLAGS="-g -O2 -m64 -maltivec" CXXFLAGS="-g -O2 -m64 -maltivec"
To check if your processor has support for vector registers (altivec):
cat /proc/cpuinfo | grep altivec
and should have something like this:
cpu : PPC970, altivec supported
If libunwind seems to not work (backtracing failing), try to compile
it with -O0, without optimizations. There are some compiler problems
depending on the version of your gcc.
* Regression Testing
After building the library, you can run a set of regression tests with:
$ make check
** Expected results on IA-64 Linux
Unless you have a very recent C library and compiler installed, it is
currently expected to have the following tests fail on IA-64 Linux:
Gtest-init (should pass starting with glibc-2.3.x/gcc-3.4)
Ltest-init (should pass starting with glibc-2.3.x/gcc-3.4)
test-ptrace (should pass starting with glibc-2.3.x/gcc-3.4)
run-ia64-test-dyn1 (should pass starting with glibc-2.3.x)
This does not mean that libunwind cannot be used with older compilers
or C libraries, it just means that for certain corner cases, unwinding
will fail. Since they're corner cases, it is not likely for
applications to trigger them.
Note: If you get lots of errors in Gia64-test-nat and Lia64-test-nat, it's
almost certainly a sign of an old assembler. The GNU assembler used
to encode previous-stack-pointer-relative offsets incorrectly.
This bug was fixed on 21-Sep-2004 so any later assembler will be
fine.
** Expected results on x86 Linux
The following tests are expected to fail on x86 Linux:
Gtest-resume-sig (fails to get SIGUSR2)
Ltest-resume-sig (likewise)
Gtest-dyn1 (no dynamic unwind info support yet)
Ltest-dyn1 (no dynamic unwind info support yet)
test-setjmp (longjmp() not implemented yet)
run-check-namespace (no _Ux86_getcontext yet)
test-ptrace
** Expected results on x86-64 Linux
The following tests are expected to fail on x86-64 Linux:
Gtest-dyn1 (no dynamic unwind info support yet)
Ltest-dyn1 (no dynamic unwind info support yet)
Gtest-init (see http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18743)
Ltest-init (likewise)
test-async-sig (crashes due to bad unwind-info?)
test-setjmp (longjmp() not implemented yet)
run-check-namespace (no _Ux86_64_getcontext yet)
run-ptrace-mapper (??? investigate)
run-ptrace-misc (see http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18748
and http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18749)
** Expected results on PARISC Linux
Caveat: GCC v3.4 or newer is needed on PA-RISC Linux. Earlier
versions of the compiler failed to generate the exception-handling
program header (GNU_EH_FRAME) needed for unwinding.
The following tests are expected to fail on x86-64 Linux:
Gtest-bt (backtrace truncated at kill() due to lack of unwind-info)
Ltest-bt (likewise)
Gtest-resume-sig (Gresume.c:my_rt_sigreturn() is wrong somehow)
Ltest-resume-sig (likewise)
Gtest-init (likewise)
Ltest-init (likewise)
Gtest-dyn1 (no dynamic unwind info support yet)
Ltest-dyn1 (no dynamic unwind info support yet)
test-setjmp (longjmp() not implemented yet)
run-check-namespace (toolchain doesn't support HIDDEN yet)
** Expected results on HP-UX
"make check" is currently unsupported for HP-UX. You can try to run
it, but most tests will fail (and some may fail to terminate). The
only test programs that are known to work at this time are:
tests/bt
tests/Gperf-simple
tests/test-proc-info
tests/test-static-link
tests/Gtest-init
tests/Ltest-init
tests/Gtest-resume-sig
tests/Ltest-resume-sig
** Expected results on PPC64 Linux
"make check" should run with no more than 10 out of 24 tests failed.
* Performance Testing
This distribution includes a few simple performance tests which give
some idea of the basic cost of various libunwind operations. After
building the library, you can run these tests with the following
commands:
$ cd tests
$ make perf
* Contacting the Developers
Please direct all questions regarding this library to:
libunwind-devel@nongnu.org
You can do this by sending a mail to libunwind-request@nongnu.org with
a body of:
subscribe libunwind-devel
or you can subscribe and manage your subscription via the
web-interface at:
https://savannah.nongnu.org/mail/?group=libunwind
|
