  We present a finite-size study of the athermal quasistatic yielding
transition in structural glasses featuring a wide range of mechanical disorder.
We find a crossover from gradual yielding in small systems, to a macroscopic
discontinuous stress drop as the system size is increased. The crossover size
grows significantly as the sample's structural disorder approaches the maximal
value that a glass can attain. Our results suggest an analogy between the
nature of the athermal quasistatic yielding transition in structural glasses
and brittle fracture of fuse models and elastic networks. We discuss our
results in the context of recent claims in the literature.
