undefined symbol

[Ralf Mueller-2]

Hi out there,
I use swig on a rather large C-function-library without serious
problems. Now I buildt a few C++ classes around that lib, but generating
a ruby interface fails with this message on the shared lib:
undefined symbol: _ZNSs4_Rep20_S_empty_rep_storageE

Its seems to be added by swig, so I am unsure, how to react on this. If
anyone know this behaviour, please let me know!

Thanks in advance,
Ralf



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[Alan Woodland-5]

2009/10/28 Ralf Mueller <ralf.mueller@...>:
> Hi out there,
> I use swig on a rather large C-function-library without serious
> problems. Now I buildt a few C++ classes around that lib, but generating
> a ruby interface fails with this message on the shared lib:
> undefined symbol: _ZNSs4_Rep20_S_empty_rep_storageE
>
> Its seems to be added by swig, so I am unsure, how to react on this. If
> anyone know this behaviour, please let me know!
>
The symbol is the mangled form of std::basic_string<char,
std::char_traits<char>, std::allocator<char>
>::_Rep::_S_empty_rep_storage, which being undefined seems to imply
that you're missing a link against libstdc++ somewhere. Did you use
g++ to compile the C++ code or gcc?

Alan

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[Ralf Mueller-2]

a very simple example:
ram@melian:~/src/cdi/branches/cdi-ram/cdi/interfaces/test/simple> cat
simple.h
class S {
  S();
  ~S();
  void test(char *var);
  int i;
};
ram@melian:~/src/cdi/branches/cdi-ram/cdi/interfaces/test/simple> cat
simple.cpp
#include <iostream>
#include "simple.h"
using namespace std;
S::S()  {i=1;cout << "init" << endl;}
S::~S() {i=0;cout << "destroy" << endl;}
void
S::test(char *var) {cout << i << ' ' << var << endl;}
ram@melian:~/src/cdi/branches/cdi-ram/cdi/interfaces/test/simple> cat
rsimple.i
%module rsimple
%{
#include "simple.h"
%}
%include "simple.h"

after creating a makefile with mkmf module for ruby an d compiling, i get:
ram@melian:~/src/cdi/branches/cdi-ram/cdi/interfaces/test/simple> irb
-rrsimple
/home/ram/src/cdi/branches/cdi-ram/cdi/interfaces/test/simple/rsimple.so:
/home/ram/src/cdi/branches/cdi-ram/cdi/interfaces/test/simple/rsimple.so:
undefined symbol: _ZNSt8ios_base4InitD1Ev -
/home/ram/src/cdi/branches/cdi-ram/cdi/interfaces/test/simple/rsimple.so
(LoadError)
    from /home/ram/local/lib/ruby/1.8/irb/init.rb:254:in `load_modules'
    from /home/ram/local/lib/ruby/1.8/irb/init.rb:252:in `each'
    from /home/ram/local/lib/ruby/1.8/irb/init.rb:252:in `load_modules'
    from /home/ram/local/lib/ruby/1.8/irb/init.rb:21:in `setup'
    from /home/ram/local/lib/ruby/1.8/irb.rb:54:in `start'
    from /home/ram/local/bin/irb:13

So, I get another undefinded symbol here, but it's a simmilar behaviour,
I guess.

Regards
Ralf

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