hi all, currently it's not possible to include boost/plugin.hpp or boost/plugin/virtual_constructors.hpp from different object files with gcc-3.4.6 including plugin.hpp from two object files: tim@laptop ~/sandbox $ g++ main.cpp t1.o t2.o t2.o: In function `boost::dynamic_visitor_base::~dynamic_visitor_base()': t1.cpp:(.text+0x0): multiple definition of `boost::dynamic_visitor_base::~dynami c_visitor_base()' t1.o:t1.cpp:(.text+0x0): first defined here t2.o: In function `boost::dynamic_visitor_base::~dynamic_visitor_base()': t1.cpp:(.text+0x28): multiple definition of `boost::dynamic_visitor_base::~dynam ic_visitor_base()' t1.o:t1.cpp:(.text+0x28): first defined here t2.o: In function `boost::dynamic_visitor_base::~dynamic_visitor_base()': t1.cpp:(.text+0x50): multiple definition of `boost::dynamic_visitor_base::~dynam ic_visitor_base()' t1.o:t1.cpp:(.text+0x50): first defined here t2.o:(.bss+0x0): multiple definition of `(anonymous namespace)::_1' t1.o:(.bss+0x0): first defined here t2.o:(.bss+0x1): multiple definition of `(anonymous namespace)::_2' t1.o:(.bss+0x1): first defined here t2.o:(.bss+0x2): multiple definition of `(anonymous namespace)::_3' t1.o:(.bss+0x2): first defined here t2.o:(.bss+0x3): multiple definition of `(anonymous namespace)::_4' t1.o:(.bss+0x3): first defined here t2.o:(.bss+0x4): multiple definition of `(anonymous namespace)::_5' t1.o:(.bss+0x4): first defined here t2.o:(.bss+0x5): multiple definition of `(anonymous namespace)::_6' t1.o:(.bss+0x5): first defined here t2.o:(.bss+0x6): multiple definition of `(anonymous namespace)::_7' t1.o:(.bss+0x6): first defined here t2.o:(.bss+0x7): multiple definition of `(anonymous namespace)::_8' t1.o:(.bss+0x7): first defined here t2.o:(.bss+0x8): multiple definition of `(anonymous namespace)::_9' t1.o:(.bss+0x8): first defined here collect2: ld returned 1 exit status t1.cpp & t2.cpp contain: #include "boost/plugin.hpp" main.cpp contains: int main(){return 0;} similar things happen with boost/plugin/virtual_constructors.hpp ... not sure, if it's a but in the library, or a compiler bug ... cheers ... tim -- TimBlechmann@gmx.de ICQ: 96771783 http://www.mokabar.tk You can play a shoestring if you're sincere John Coltrane