Using thread_local in an iOS application

I am trying to use thread_local inside an iOS application.

Here's how I am defining it in one of my methods:

PlatformServices::ThreadData* PlatformServices::Get()
{
    thread_local ThreadData _threadData;

    return &_biData;
}

However, when I try to link, I get the following error:

Undefined symbols for architecture i386: "__tlv_bootstrap", referenced from: NS::PlatformServices::Get()::_biData in libMyLibInfra.a(PlatformServices.o) guard variable for NS::PlatformServices::Get()::_threadData in libMobileBIInfra.a(PlatformServices.o)

Am I missing a library or something?

(XCode 6.1)