Where can I find a reference for compiler flags?

[Mike Brockus]

On Wednesday, 5 June 2019 at 09:45:53 UTC, Jacob Carlborg wrote:
> On 2019-06-05 03:19, Mike Brockus wrote:
>
>> Where can I find a reference for compiler flags?
>
> Here's the reference [1]. You can also run "dmd --help" to 
> print out the available flags. [1] might not be up to date.
>
> [1] https://dlang.org/dmd-windows.html

This bit of information was helpful.  But do you know what this 
is -dip- followed by some number...  I seen three of them in Mir 
Algorithm meson build.