Undefined symbols for architecture x86_64 on Xcode 6.3

I'am finalising an Open Source C coded CometD library, i thought it would be a good idea to open it to OSX/iOS users, like myself.

In order to ease up the work for OSX/iOS developers i wanted to switch from a static C library to a Xcode iOS Static Libary. So i followed advices found on the net, and generated a static iOS compatible library.

The problem is that, each time i try to use it i get an of type :

Undefined symbols for architecture x86_64: ******, referenced from: -********** in *******.a(*******.o)

This error get repeated for almost every C function that i have in my library.

First i though maybe the library is not x86_64 compatible, empty, or really doesn't have any x86_64 symbol in it.

So i checked with a "lipo -info" on the library and here is the answer :

To really be sure i also used "nm -arch x86_64" on the library, and went fetching for several undefined functions reported by Xcode as errors. I thought i will be wrong and find nothing but guess what ? I found the symbols :

So my question is :

If the symbols are present in a x86_64 compatible library, why is Xcode prompting this error ? Even if i compile the library for all arm*/s types i still get this x86_64 error.

Am i unaware of something or am i just doing it wrong ?

Your answers are always appreciated.