The Linker Optimizer does not use Mono anymore, but .NET Core.
All you need it .NET Core 3. I am using
$ dotnet --info
.NET Core SDK (reflecting any global.json):
Version: 3.0.100
Commit: 04339c3a26
Runtime Environment:
OS Name: Mac OS X
OS Version: 10.14
OS Platform: Darwin
RID: osx.10.14-x64
Base Path: /usr/local/share/dotnet/sdk/3.0.100/
dotnet build Mono.Linker.Optimizer
dotnet build Tests/Blazor/<sample>
For instance
dotnet build Tests/Blazor/StandaloneApp
This will automatically generate XML output in ./Tests/Blazor/<sample>/optimizer-report.xml .
Open the top-level Directory.Build.props and you'll find this section at the bottom:
<PropertyGroup Condition="'$(UseLocalBuild)' != 'true'">
<LocalDotNet>dotnet</LocalDotNet>
<AspNetVersion>3.0.0-preview9.19465.2</AspNetVersion>
<AspNetCoreVersion>3.0.0-rc1.19457.4</AspNetCoreVersion>
<EntityFrameworkVersion>3.0.0-rc1.19456.14</EntityFrameworkVersion>
<BlazorVersion>3.0.0-preview9.19465.2</BlazorVersion>
</PropertyGroup>