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146 lines
4.8 KiB
Plaintext
146 lines
4.8 KiB
Plaintext
-*- mode: Outline -*-
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This is version 0.97 of the unwind library. At the moment, only the
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IA-64 Linux (IPF Linux) platform is fully supported. Some basic
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support for x86 and HP-UX/IPF exists also. However, the x86 support
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is based mostly on the frame-chain and does not reliably use unwind
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information yet, so its utility is limited. Similarly, the HP-UX/IPF
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support is incomplete, though it is sufficient to do a basic
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backtrace. unw_resume() is not supported, however.
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* Important GCC v3.4.0 Caveat
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GCC v3.4.0 breaks C++ ABI compatibility and because of that, libunwind
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cannot easily be used as the unwinder for GCC v3.4.0. The GCC
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developers are aware of the problem [1] and the expectation is that
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the problem will be fixed with GCC v3.4.1. In the meantime, it may be
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best to avoid using GCC v3.4.0.
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[1] http://gcc.gnu.org/ml/gcc/2004-04/msg00989.html
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* General Build Instructions
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In general, this library can be built and installed with the following
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commands:
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$ ./configure
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$ make
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$ make install prefix=PREFIX
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where PREFIX is the installation prefix. By default, a prefix of
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/usr/local is used, such that libunwind.a is installed in
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/usr/local/lib and unwind.h is installed in /usr/local/include. For
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testing, you may want to use a prefix of /usr/local instead.
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* Building with Intel compiler
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** Up to version 7
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To build libunwind with the Intel Electron compiler (ECC), it is
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recommended to run configure like this:
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$ ./configure CC=ecc CXX=ecc CCAS=gcc CCASFLAGS=-g \
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LDFLAGS="-L$PWD/src/.libs"
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The reason for this is that ECC uses the Intel assembler, which
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doesn't grok some of the IA-64 assembly code in the "tests" directory.
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For an ECC-built version of libunwind to work properly, you also need
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to ensure that /usr/include/asm/fpu.h contains a "long double" member
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called "__dummy" in the declaration of "struct ia64_fpreg". Without
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that member, variables of type unw_context_t won't be aligned
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properly.
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** Version 8 and later
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Starting with version 8, the preferred name for the IA-64 Intel
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compiler is "icc" (same name as on x86). Thus, the configure-line
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should look like this:
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$ ./configure CC=icc CFLAGS="-g -O3 -ip" CXX=icc CCAS=gcc CCASFLAGS=-g \
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LDFLAGS="-L$PWD/src/.libs"
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* Building on HP-UX
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For the time being, libunwind must be built with GCC on HP-UX.
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Unfortunately, gcc-3.0 and gcc-3.2 ship with a bad version of
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sys/types.h. The workaround for this is:
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$ mkdir $top_dir/include/sys
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$ cp /usr/include/sys/types.h $top_dir/include/sys
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Apart from this glitch, libunwind should configure and install on
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HP-UX like this:
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$ ./configure CFLAGS="-g -O2 -mlp64"
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Caveat: Unwinding of 32-bit (ILP32) binaries is not supported
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at the moment.
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* Regression Testing
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After building the library, you can run a set of regression tests with:
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$ make check
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** Expected results on IA-64 Linux
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Unless you have a very recent C library and compiler installed, it is
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currently expected to have the following tests fail on IA-64 Linux:
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Gtest-init (should pass starting with glibc-2.3.x/gcc-3.4)
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Ltest-init (should pass starting with glibc-2.3.x/gcc-3.4)
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test-ptrace (should pass starting with glibc-2.3.x/gcc-3.4)
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run-ia64-test-dyn1 (should pass starting with glibc-2.3.x)
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This does not mean that libunwind cannot be used with older compilers
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or C libraries, it just means that for certain corner cases, unwinding
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will fail. Since they're corner cases, it is not likely for
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applications to trigger them.
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** Expected results on x86 Linux
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The following tests are expected to fail on x86 Linux:
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test-proc-info (x86 unwinder doesn't use unwind-info yet)
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Gtest-exc (unw_resume() not implmented yet)
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Ltest-exc (unw_resume() not implmented yet)
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test-setjmp (unw_resume() not implmented yet)
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** Expected results on HP-UX
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"make check" is currently unsupported for HP-UX. The only test
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programs that are known to work at this time are tests/bt (which
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produces various backtraces) and tests/Gperf-simple, which does some
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simple performance measurements.
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* Performance Testing
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This distribution includes a few simple performance tests which give
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some idea of the basic cost of various libunwind operations. After
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building the library, you can run these tests with the following
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commands:
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$ cd tests
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$ make perf
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* Contacting the Developers
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Please direct all questions regarding this library to:
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libunwind@linux.hpl.hp.com
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posting a question. You can do this by sending a mail to
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subscribe libunwind
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