Erlang parse_transform second parameter

Question

When defining a parse_transform, the function has two parameters:

parse_transform(FormsIn, Options) -> FormsOut

What is the meaning of the Options parameter? I'm trying to define additional options for transforming.

Answer 1

The second arg in the parse_transform function is the list of options to the compiler. They are both the explicit options in the compile call and some default options added by the compiler. The compiler ignores options it does no recognise so it it possible to pass specific options into the parse_transform function.