Date: Wed, 27 Dec 2006 18:09:41 +0100 From: Gergely CZUCZY <phoemix@harmless.hu> To: freebsd-hackers@freebsd.org Subject: unresolved symbol for C++ class dtor Message-ID: <20061227170941.GA44402@harmless.hu>
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hello
i've written a testprogram to check how dynamic linking
works for C++ code, specially for class, when are global objects'
ctors and dtors are being called etc.
however, i've run into a very strange problem.
in the main program i have a "class module", which has
a virtual destructor. The dlopen()'d module has a class
derived from this one.
Main program:
class module {
public:
module();
virtual ~module();
};
mod_bar:
class modbar: public module {
public:
modbar(): module() {};
~modbar() {};
};
Of course the main program's module class's methods are
not just declared they are also defined elsewhere.
This is the way i try to dlopen() mod_bar:
if ( !(dh =3D dlopen(MOD_BAR, RTLD_NOW|RTLD_GLOBAL)) ) {
...
}
i've got the following error message when running the code:
Unable to dlopen(lib/mod_bar.so): lib/mod_bar.so: Undefined symbol "_ZN6mod=
uleD2Ev"
however, i've check the testprogram:
$ nm bin/dltest | grep _ZN6moduleD2Ev
08048918 T _ZN6moduleD2Ev
so it does exist.
i've tried to compile the binaries both without and without -fpic -fPIC,
but nothing had changed.
the question is, what am i doing wrong? according to the symbols,
the dynamic linker should be able to load that symbol, however it doesn't.
what do i need to do to fix this?
looking forward for answers,
Bye,
Gergely Czuczy
mailto: gergely.czuczy@harmless.hu
--=20
Weenies test. Geniuses solve problems that arise.
--5vNYLRcllDrimb99
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