[Qt-interest] Undefined symbol error when using singleton class with Qt plugins

[Andreas Unger]

Hi all,

Attached please find a small test project consisting of a singleton class
with two public methods: testString() and printTestString()

The plugin in the project has only one method in its interface:
printTestString();

When Singleton::printTestString is called,  TestPlugin::printTestString() is
called in turn. The string that is printed in the plugin is this:
Singleton::instance()->testString()

Could someone please help me figure out why I get this error when I try to
run the code:

./Test: symbol lookup error: libtestplugin.so: undefined symbol:
_ZN9Singleton8instanceEv

It seems likes the symbol relating to the static Singleton::instance()
method is undefined. How could I fix this? I would really appreciate your
input.

Cheers,
Andreas
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