On 04/14/2016 12:32 AM, Phillip Lord wrote:
> I also have both Andy and Angelo's build
> failures working (er, failing) reproducibly now. It also appears that my
> autoload patch on master is causing a build failure (only on windows).
>
> If no one solves it first, I will bisect this as soon as possible, but in
> practice this is likely to be next week.

If you're right then there must be at least two bugs, right? Your 
autoload patch is only on master, but people are also reporting problems 
in the emacs-25 branch.

I am suspicious of copy-file. Why does it copy files possibly in text 
mode on MS-Windows, while truncating based on byte counts? That sounds 
like a recipe for trouble, as the miscount could cause file "truncation" 
to instead append a bunch of null bytes, which sounds like the symptoms 
you're observing.

Does the attached patch work around one of the bugs for you? This patch 
shouldn't affect behavior on GNUish or POSIXish hosts.