mirror of
https://github.com/tobast/libunwind-eh_elf.git
synced 2024-11-10 19:08:21 +01:00
158 lines
5.1 KiB
Text
158 lines
5.1 KiB
Text
-*- mode: Outline -*-
|
|
|
|
This is version 0.97 of the unwind library. At the moment, only the
|
|
IA-64 Linux (IPF Linux) platform is fully supported. Some basic
|
|
support for x86 and HP-UX/IPF exists also. However, the x86 support
|
|
is based mostly on the frame-chain and does not reliably use unwind
|
|
information yet, so its utility is limited. Similarly, the HP-UX/IPF
|
|
support is incomplete, though it is sufficient to do a basic
|
|
backtrace. unw_resume() is not supported, however.
|
|
|
|
* Important GCC v3.4.0 Caveat
|
|
|
|
GCC v3.4.0 breaks C++ ABI compatibility and because of that, libunwind
|
|
cannot easily be used as the unwinder for GCC v3.4.0. The GCC
|
|
developers are aware of the problem [1] and the expectation is that
|
|
the problem will be fixed with GCC v3.4.1. In the meantime, it may be
|
|
best to avoid using GCC v3.4.0.
|
|
|
|
[1] http://gcc.gnu.org/ml/gcc/2004-04/msg00989.html
|
|
|
|
* General Build Instructions
|
|
|
|
In general, this library can be built and installed with the following
|
|
commands:
|
|
|
|
$ ./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
|
|
|
|
** Up to version 7
|
|
|
|
To build libunwind with the Intel Electron compiler (ECC), it is
|
|
recommended to run configure like this:
|
|
|
|
$ ./configure CC=ecc CXX=ecc CCAS=gcc CCASFLAGS=-g \
|
|
LDFLAGS="-L$PWD/src/.libs"
|
|
|
|
The reason for this is that ECC uses the Intel assembler, which
|
|
doesn't grok some of the IA-64 assembly code in the "tests" directory.
|
|
|
|
For an ECC-built version of libunwind to work properly, you also need
|
|
to ensure that /usr/include/asm/fpu.h contains a "long double" member
|
|
called "__dummy" in the declaration of "struct ia64_fpreg". Without
|
|
that member, variables of type unw_context_t won't be aligned
|
|
properly.
|
|
|
|
** 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.
|
|
|
|
* 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.
|
|
|
|
** Expected results on x86 Linux
|
|
|
|
The following tests are expected to fail on x86 Linux:
|
|
|
|
test-proc-info (x86 unwinder doesn't use unwind-info yet)
|
|
Gtest-exc (unw_resume() not implmented yet)
|
|
Ltest-exc (unw_resume() not implmented yet)
|
|
test-setjmp (unw_resume() not implmented 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
|
|
|
|
* 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@linux.hpl.hp.com
|
|
|
|
For spam protection, you'll have to subscribe to this list before
|
|
posting a question. You can do this by sending a mail to
|
|
libunwind-request@linux.hpl.hp.com with a body of:
|
|
|
|
subscribe libunwind
|
|
|
|
Note: the host that is running this list is behind a firewall, so
|
|
you'll not be able to use the Web interface to manage your
|
|
subscription. Send a mail containing "help" to
|
|
libunwind-request@linux.hpl.hp.com for information on how to manage
|
|
your subscription via email.
|