Re: c++ dlopen plugin --> returns undefined symbol

[Timothy Baldwin]

In message <f6li1g$jav$00$1@news.t-online.com>, Thomas Drillich
<th@drillich.com> wrote:

> Hi
> 
> I'm trying to run the C++ dlopen example from
> http://www.linux.org/docs/ldp/howto/C++-dlopen/thesolution.html.
> but I always get the error message
> "Cannot load library: .libs/libtriangle.so: undefined symbol:
> _ZTI7Polygon"
> 
> I see that the compiler renames the >Polygon< class, the >Polygon< class
> is defined in a header file and included in main-program and plugin-lib.

Are you sure you haven't added a non-inline virtual function to the Polygon
class?

> But it seems that the compiler creates different symbol names each time.

It shouldn't do that.

> g++ -O0 -g3 -o cpp_dlopentest cpp_dlopentest.o -ldl

You should pass -rdynamic when linking the main program so that the plugin
can refer to symbols in main program.

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