Thanks to a tip I've tracked this down. This seems to only be the case when
I have sccache enabled. Disabling it gives me nice quick incremental builds
again. Of course that isn't an ideal solution but it will do for now.

On Mon, Aug 19, 2019 at 1:55 PM Dave Townsend <> wrote:

> For a couple of weeks now I've seen that any attempt to build Firefox,
> even incremental builds seem to rebuild an awful lot of rust code. I found
> this in the source which seems to suggest why:
> But, this means that now an incremental build with a couple of code change
> that have no impact on rust is taking upwards of 4 minutes to complete in
> comparison to around 40 seconds, and the log file is full of cargo output.
> I've heard similar comments from other developers.
> This is a pretty big increase in the time to compile and test and is
> really slowing down my work. Is there any way we can avoid this?
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