Fixes #798 .

Hold on, my test case was off, the --block=ramdisk case isn't really building a ramdisk yet.

Edit: somehow main.ml doesn't get rebuilt every time.

@g2p: try https://github.com/yomimono/mirage/tree/blockier - the method name has to be unique among the classes, otherwise there can be strange collisions when Functoria reduces the graph (see mirage/functoria#79).

Thank you for digging this up!

I will revise this. There needs to be a way to specify the ramdisk size.

I've experimented with --block-size-sectors and --block-sector-size keys, but in the end, I think the size is best specified programmatically using Ramdisk.resize. Having flags that control the size in the ramdisk case and not in the block-file case would be confusing. Command-line flags also can't handle differing sizes for multiple devices.

So, please merge this branch as-is.

@g2p do you not need something like yomimono@b16848b ? I don't recall the specific surprising behavior we got with this patch or else I'd test myself.

@yomimono You're right, I had forgotten your patch when going back on my desktop.
The patch is necessary to pick the right module name near the top of the generated main.ml.
Thank you.