dub upgrade
dub --force

on a project reconfigured (from vibe.d 0.7.30 with no special dependencies or subConfigurations) to

dependency "vibe-d" version="~>0.8.0-beta.1"
dependency "diet-ng" version="~>1.1"
subConfiguration "vibe-d:core" "vibe-core"

that currently builds on 0.8.0-beta.3, produces the following in a terminal on Linux x86_64.

vibe-d:core 0.8.0-beta.3: building configuration "libevent"...
../../../.dub/packages/vibe-d-0.8.0-beta.3/vibe-d/core/vibe/internal/memory.d(3,15): Deprecation: module vibe.utils.memory is deprecated - Use the memutils package or std.experimental.allocator instead.

I've seen memutils warned about just above that as a part of that build, no doubt this is a completely separate issue, and not what I am asking about here, but it does indicate that memutils is there.

## Warning for package memutils, configuration 32mscoff ##

The following compiler flags have been specified in the package description file. They are handled by DUB and direct use in packages is discouraged. Alternatively, you can set the DFLAGS environment variable to pass custom flags to the compiler, or use one of the suggestions below:

-m32mscoff: Use --arch=x86/--arch=x86_64/--arch=x86_mscoff to specify the target architecture

What's the scoop?