libc++abi can't find unwind symbols

[valpackett]

Building a c++ program on FreeBSD -CURRENT with latest packages from the cloudabi pkg repo:

x86_64-unknown-cloudabi-ld: error: undefined symbol: _Unwind_RaiseException
>>> referenced by /usr/obj/cloudabi-ports/build/0/libcxxabi-5.0.0.src/src/cxa_exception.cpp
>>>               cxa_exception.cpp.o:(__cxa_throw) in archive /usr/local/x86_64-unknown-cloudabi/lib/libc++abi.a

x86_64-unknown-cloudabi-ld: error: undefined symbol: _Unwind_DeleteException
>>> referenced by /usr/obj/cloudabi-ports/build/0/libcxxabi-5.0.0.src/src/cxa_exception.cpp
>>>               cxa_exception.cpp.o:(__cxa_end_catch) in archive /usr/local/x86_64-unknown-cloudabi/lib/libc++abi.a

x86_64-unknown-cloudabi-ld: error: undefined symbol: _Unwind_RaiseException
>>> referenced by /usr/obj/cloudabi-ports/build/0/libcxxabi-5.0.0.src/src/cxa_exception.cpp
>>>               cxa_exception.cpp.o:(__cxa_rethrow) in archive /usr/local/x86_64-unknown-cloudabi/lib/libc++abi.a

x86_64-unknown-cloudabi-ld: error: undefined symbol: _Unwind_Resume
>>> referenced by /usr/obj/cloudabi-ports/build/0/libcxxabi-5.0.0.src/src/cxa_demangle.cpp
>>>               cxa_demangle.cpp.o:(__cxa_demangle) in archive /usr/local/x86_64-unknown-cloudabi/lib/libc++abi.a

x86_64-unknown-cloudabi-ld: error: undefined symbol: _Unwind_Resume
>>> referenced by /usr/obj/cloudabi-ports/build/0/libcxxabi-5.0.0.src/src/cxa_demangle.cpp
>>>               cxa_demangle.cpp.o:(__cxa_demangle) in archive /usr/local/x86_64-unknown-cloudabi/lib/libc++abi.a

They do exist in libunwind…

% objdump -t /usr/local/x86_64-unknown-cloudabi/lib/libunwind.a | sr Unwind_Resume
000000000000005a l     O .rodata.str1.1 000000000000001a .L__func__._Unwind_Resume_or_Rethrow
0000000000000000 l    d  .text._Unwind_Resume_or_Rethrow        0000000000000000 .text._Unwind_Resume_or_Rethrow
0000000000000000         *UND*  0000000000000000 _Unwind_Resume
0000000000000000 g     F .text._Unwind_Resume_or_Rethrow        0000000000000083 _Unwind_Resume_or_Rethrow
000000000000006e l     O .rodata.str1.1 000000000000000f .L__func__._Unwind_Resume
0000000000000000 l    d  .text._Unwind_Resume   0000000000000000 .text._Unwind_Resume
0000000000000000 g     F .text._Unwind_Resume   00000000000000c4 _Unwind_Resume

-fno-exceptions works, but then I don't have exceptions…