Hi, I have an archive file, when I do a nm on it, I can see. 00000000 V _ZTV13VLH_Container the compile option to create the objects for the archive (.a) is gcc -c -Wno-ctor-dtor-privacy -fno-rtti -MMD -pthread -Wno-deprecated -Wall -O2 I have an .so that link with the above archive, when I do an nm on it, I can see: U _ZTI13VLH_Container the compile option to creates objects for the .so is g++ -pipe -Wall -fPIC -rdynamic -g I'm guessing that the problem for the undefined symbol is a compile option. What is the difference between _ZTV and _ZTI? When linking my so, I put the archive at the end. Any idea? Regards, VLH