how would I tell GCC to always use the "local exec" model?

[Jonathan Wilson]

On win32, a model thats similar to that is used, i.e.:
 From your description it sounds like win32 TLS model is something close
to the Local-Exec model, in that there is no function call involved in
the TLS access and the address is stored in the instruction directly

So, I need to tell GCC to always use this model.