What compiler flags can be passed to a Dlang compiler

[tejas89 via Digitalmars-d-debugger]

What compiler flags can be passed to a Dlang compiler? Definition 
of compiler flag being something like say “—wall” or “—werror” 
for example. I’m not sure what is available for the language 
since I’m new to it and hope to learn D as one of languages 
alongside C, C++, Python, Kotlin.