Oooh, shiny. I'm not very familiar with how this is all tied together, thanks for the pointer. I was a bit thrown by the apparent lack of ifdefs and such in the c definition, but I see the asm-version starts out with:

    #ifndef USE_AS_STPCPY
    # define STRCPY strcpy
    #endif

So I guess there is some logic set up in the configure-stage before building.