Elevate Warnings to Errors

[chrpai]

Is there a way at build time to elevate WIX8601 to an error instead of a warning?

For example here are two very bad behaviors that result in a "warning" and a very wrong installer being built.

Include a directory that doesn't exist ... WIX8601. All the files are missing.
Exclude a directory that doesn't exist ... WIX8601. Not only are the files from the missing directory missing (we were excluding them anyways) but ALL files mentioned in the Files@Include attribute are also missing.

[bevanweiss]

I believe this can be done as an MSBuild property
dotnet/msbuild#5774

<PropertyGroup>
  <WarningsAsErrors>WIX8601</WarningsAsErrors>
</PropertyGroup>