[Qemu-devel] Re: Compile files only once: some planning

[Paolo Bonzini <pbonzini@redhat.com>]

> The harder cases are those where the device code depends somehow on
> the architecture. Some thoughts follow.
>
> vl.c: a lot of work. Maybe the CPUState stuff should be separated to a new file.
>
> dma.c: DMA_schedule needs access to CPUState.

Most users of CPUState (e.g. qemu-timer.c and hw/dma.c) either need it 
as an opaque pointer, or only need access to target-independent stuff. 
So you could:

1) make CPUState define only common fields.  Include CPUState at the 
beginning of each per-target CPUXYZState.

2) Do s/CPUState/CPUXYZState/ on target-*/*.

3) Make it compile, possibly by undoing parts of 2) and changing parts 
of it to DO_UPCAST.

Paolo