What exactly does the compiler switch -betterC do?

[Anonymouse via Digitalmars-d-learn]

On Monday, 20 June 2016 at 06:35:32 UTC, Jacob Carlborg wrote:
> On 2016-06-19 21:53, Gary Willoughby wrote:
>> When compiling, what exactly does the -betterC flag do? The 
>> command help
>> says "omit generating some runtime information and helper 
>> functions" but
>> what does this really mean? Is there any specifics somewhere?
>
> It is intended to allow you to link an application without 
> druntime. [...]

What is the equavilent in gdc and ldc?