Unit at a time and C PCH

[Tom Tromey]

>>>>> "Diego" == Diego Novillo <dnovillo@google.com> writes:

Diego> OK.  I'm almost tempted to go further and consider removing
Diego> no-unit-at-a-time completely.  What are the cases where
Diego> -fno-unit-at-a-time is useful?

FWIW, on the incremental compiler branch, -fno-unit-at-a-time no
longer changes C parsing (it may still affect code generation).  This
reveals a few test cases whose semantics depend on this switch.

Tom