“bad codegen, pointer diff” linker error with Xcode 4

Question

Recompiling a C++ iPhone app with Xcode 4 I get this nasty linker error:

ld: bad codegen, pointer diff in __static_initialization_and_destruction_0(int, int)         


        

Answer 1

Basically any symbols in a library you link to & your own code, need to use the same visibility level, i.e. if all the symbols in a library you include are hidden you need make sure the include files referencing the symbols in your project don't try and set it to visible. the safest way to do this is to have a constant level of default visibility across your project, for me it only became a problem with optimisations on.