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20.9.2014 - We have just updated our course layouts and descriptions and added our 2015 schedule.

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)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
C051 - C and C based languages - C++ - General
  [3587] C++ Courses - do I get official certification at the end of my Well House course? - (2012-01-20)
  [3250] C++ - how we teach the language and the concepts behind the language - (2011-04-17)
  [3155] Rake - a build system using code written in Ruby - (2011-02-03)
  [3129] Extra courses - C and C++ - (2011-01-12)
  [3067] Using C and C++ functions in the same program - how to do it - (2010-11-24)
  [3052] Getting your C++ program to run - (2010-11-15)
  [2851] Further C++ material - view new or old - (2010-07-04)
  [2763] Our C and C++ training course are on Open Source platforms - (2010-05-13)
  [2577] Complete teaching example - C++, inheritance, polymorphism - (2010-01-15)
  [2536] All the Cs ... and Java too - (2009-12-13)
  [2504] Learning to program in ... - (2009-11-15)
  [2370] C++, Python, and other training - do we use an IDE - (2009-08-21)


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Associated Classes - using objects of one class within another
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Reading (and writing) files in C++
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