Hi! On 02.02.2010, at 20:16, ambika wrote: > /home/ambika/llvm1/llvm-obj/Release/lib/ > libLLVMipa.a(ProfileAlias.o): In > function `llvm::createProfileAliasPass()': > ProfileAlias.cpp:(.text+0x46): undefined reference to `vtable for > ProfileAlias' http://gcc.gnu.org/faq.html#vtables Does that help? Andi