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Dwarf Exception Unwind Info

Archive - Originally posted on "The Horse's Mouth" - 2012-07-20 20:35:29 - Graham Ellis

I spent quite a while with one of the delegates on our C and C++ course yesterday looking for the cause of compile / load errors including the text:
  Dwarf Exception Unwind Info

The whole thing was very bizarre - from a perfect compile just a minute of two earlier, and with minimal source code changes, the whole thing had gone wild:

  munchkin:cj12 grahamellis$ gcc -o flow2 flow2.cpp
  Undefined symbols for architecture x86_64:
     "std::ios_base::Init::Init()", referenced from:
       __static_initialization_and_destruction_0(int, int)in cc23QGz4.o
     "std::ios_base::Init::~Init()", referenced from:
       ___tcf_0 in cc23QGz4.o
  etc
culminating in that dwarf exception message.

Alas - solution turns out to be absurdly simple. I had called up the C compiler rather than the C++ compiler ... but given it C++ code. Change from gcc to g++ and it works perfectly:

  munchkin:cj12 grahamellis$ g++ -o flow2 flow2.cpp
  munchkin:cj12 grahamellis