xcode linker error

Question

I'm trying to compile a bundle that uses a third party library. I've had this working a while ago, but now it just refuses to link. Here's a sample of the errors:

  "lwpp::GlobalBase<char const* ()(char const*)>::globPtr", referenced from:
  __ZN4lwpp10GlobalBaseIFPKcS2_EE7globPtrE$non_lazy_ptr in main.o
  __ZN4lwpp10GlobalBaseIFPKcS2_EE7globPtrE$non_lazy_ptr in license-2998A499.o 
  ...
ld: symbol(s) not found 
collect2: ld returned 1 exit status

The third party project (lwpp) is included as a sub-project. I've clicked and dragged it's build products into the Targets > plugin_name > Link Binary With Libraries, but it still does not work. If I import the source files for the lwpp, then these link errors all go away. I'm at a complete loss.

Answer 1

Apparently lwpp::GlobalBase< char const* ()(char const*) > ::globPtr must be defined somewhere. Either you have to define it yourself in a source file, or if it is already defined in the library, you may need to declare it as extern in main.cpp .