I have some failed tests reported with 'make check' on latest libunwind (0.99).
My configuration is a linux 2.6.38 ubuntu 11.04 running on AMD athlon 64 x2 CPU. The lib was compiled with gcc 4.5.2 and the CFLAGS was appended with -U_FORTITY_SOURCE.
PASS: test-proc-info
PASS: test-static-link
PASS: test-strerror
PASS: Gtest-bt
PASS: Ltest-bt
PASS: Gtest-exc
PASS: Ltest-exc
PASS: Gtest-init
PASS: Ltest-init
PASS: Gtest-concurrent
PASS: Ltest-concurrent
failed to get SIGUSR2
FAILURE: detected 1 errors
FAIL: Gtest-resume-sig
failed to get SIGUSR2
FAILURE: detected 1 errors
FAIL: Ltest-resume-sig
FAILURE: expected 13, not 4 frames below signal frame
FAIL: Gtest-dyn1
FAILURE: expected 13, not 4 frames below signal frame
FAIL: Ltest-dyn1
PASS: test-async-sig
PASS: test-flush-cache
PASS: test-init-remote
PASS: test-mem
PASS: test-setjmp
FAILURE: unw_step() returned -8 for ip=ffffffff (start ip=4001e416)
unwind failed with ret=-8
FAILURE: detected 2 errors
FAIL: test-ptrace
PASS: Ltest-nomalloc
ERROR: Symbol "_Ux86_getcontext" missing.
FAILURE: Detected 1 errors
FAIL: run-check-namespace
FAILURE: unw_step() returned -7 for ip=804870b (start ip=400c5c73)
unwind failed with ret=-7
FAILURE: unw_step() returned -7 for ip=400c5d11 (start ip=400cefc5)
unwind failed with ret=-7
FAILURE: detected 4 errors
FAIL: run-ptrace-mapper
FAILURE: unw_step() returned -7 for ip=8048f4f (start ip=80485f3)
unwind failed with ret=-7
FAILURE: unw_step() returned -7 for ip=8048620 (start ip=80485f3)
unwind failed with ret=-7
FAILURE: unw_step() returned -7 for ip=4000da31 (start ip=40009873)
unwind failed with ret=-7
FAILURE: unw_step() returned -7 for ip=40009979 (start ip=40009243)
unwind failed with ret=-7
FAILURE: unw_step() returned -7 for ip=400096f2 (start ip=400090a3)
unwind failed with ret=-7
FAILURE: detected 10 errors
FAIL: run-ptrace-misc
===========================================
8 of 25 tests failed
===========================================