[cfe-dev] libcxx, libcxxabi, and runtime_error

[Marshall Clow]

On May 27, 2014, at 6:09 AM, Richard Gorton <rcgorton at cognitive-electronics.com> wrote:

>> Hi - I'm trying to get C++ support for our architecture up and working (as a cross compiled environment) and I'm encountering some link errors:
>> 
>> build/lib/libc++.a(locale.cpp.o):(.data.rel.ro+0x2d0): undefined reference to `std::runtime_error::~runtime_error()'
>> 
>> 
>> When I nm libcxx:locale.cpp.o, I see:
>>                U _ZNSt13runtime_errorD1Ev
>> 
>> 
>> In libcxxabi:stdexcept.o, I see:
>> 0000000000000150 T _ZNSt13runtime_errorD0Ev
>>                U _ZNSt13runtime_errorD1Ev
>> 00000000000001f8 T _ZNSt13runtime_errorD2Ev
>> 
>> That is, in both cases, …runtime_errorD1Ev is undefined.
>> 
>> When I use c++filt to demangle the symbols listed in stdexcept.o, they all decode to
>> 	std::runtime_error::~runtime_error()
>> 
>> 
>> Any suggestions as to how to determine what is happening and why?
>> 
>> My setup: clang/llvm 3.3, with libcxx from the 3.3 release; libcxxabi is much more recent (6-May-2014, svn rev 208087)

I’m guessing that that’s your problem.
ISTR that there was some migration of destructors between libc++ and libc++abi in the 3.3/3.4 time frame.
(Though I would have expected multiple definitions, rather than no one defining it).

If you’re using libc++abi, then it should define the destructors for standard library exception classes.

— Marshall