Re: [Iverilog-devel] -Wtimescale issue

[Evan L. <sa2...@cy...>]

On 28/01/2021 18:54, Cary R. via Iverilog-devel wrote:

> For your case where you know what you are doing and
> it has been thought out I would just disable the warning.
>

An excellent idea, but...

The wiki says warnings should be prefixed with 'no-' to disable them.
After some experimentation it turns out that you need to put a space
after the 'W', and the 'no-' before the 'timescale' (ie. '-W
no-timescale'). This works for the case I described, but then the case I
described only generates a warning if you compile with '-Wtimescale'
anyway, so this just restores the default behaviour.

If you have a more serious case in which some earlier modules have no
explicit timescale, and a later one does, '-W no-timescale' *doesn't*
turn off the warning. You could argue that, in this case, the user
should get a warning and shouldn't be able to turn it off. So maybe it's
not a problem, and just needs some documentation that this warning can't
in general be disabled.

Actually, a good option might be to implement a '-timescale'
command-line option for a default timescale (I think everyone else does
this), and then just remove the warning completely.