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what does it mean "undefined reference to `xxxx virtual table'.


Hi,
 I've an annoying problem and cannot solve it. I want to compile an old
C++ project and while linking all the object files to a single relocatable
file with "-r" option I'm getting error messages like that:

/usr/et3/src/et.o: In function `System::System(_Object_dummy *)':
/usr/et3/src/et.o(.text+0x9de97): undefined reference to `System virtual
table'
/usr/et3/src/et.o: In function `System::System(char const *)':
/usr/et3/src/et.o(.text+0x9e0e5): undefined reference to `System virtual
table'

What is the causes of this error message.

TIA.
					-emir



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