Dwarf Exception Unwind Info

For 2023 (and 2024 ...) - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))

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
  [2370] C++, Python, and other training - do we use an IDE - (2009-08-21)
  [2504] Learning to program in ... - (2009-11-15)
  [2536] All the Cs ... and Java too - (2009-12-13)
  [2577] Complete teaching example - C++, inheritance, polymorphism - (2010-01-15)
  [2763] Our C and C++ training course are on Open Source platforms - (2010-05-13)
  [2851] Further C++ material - view new or old - (2010-07-04)
  [3052] Getting your C++ program to run - (2010-11-15)
  [3067] Using C and C++ functions in the same program - how to do it - (2010-11-24)
  [3129] Extra courses - C and C++ - (2011-01-12)
  [3155] Rake - a build system using code written in Ruby - (2011-02-03)
  [3250] C++ - how we teach the language and the concepts behind the language - (2011-04-17)
  [3587] C++ Courses - do I get official certification at the end of my Well House course? - (2012-01-20)
  [4335] Flexible public courses - residential or commuting, programming newcomer or experienced, C or C++ - (2014-11-30)
  [4355] C++ in 2 days - (2014-12-18)

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Can you put names to faces?

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Reading files, and using factories to create vectors of objects from the data in C++

Some other Articles

Injection Attacks - PHP, SQL, HTML, Javascript - and how to neutralise them
The Melksham News - July 2012 - Part 1, Campus and Chamber of Commerce
Associated Classes - using objects of one class within another
Reading files, and using factories to create vectors of objects from the data in C++
Dwarf Exception Unwind Info
Can you put names to faces?
Reading (and writing) files in C++
2011 Census results - initial figures for Wiltshire.
Scenes from commuting by train
A Walk on the South Bank

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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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