Dwarf Exception Unwind Info

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

(written 2012-07-20, updated 2012-08-11)

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