i'm thinking of deprecating

_copy_target_attributes

in codegen tasks and moving that into an attribute on the generated target type itself, e.g.

PythonLibrary.synthetic_passthrough_args == ['compatibility']

. this has the additional benefit of colocating the passthrough args with the target that they're getting passed through to. i'm thinking this probably best done with a new abstract task class subclassing

SimpleCodegenTask

, and then individual codegen tasks can switch over kinda like

BinaryTool

-- and then we can deprecate using

SimpleCodegenTask

directly. if this had existed before, i wouldn't have had to update multiple internal tasks to support

compiler_option_sets

, and in general this seems far more stable. i don't think this is a lot of code, and since the idea is to make a new class first, it shouldn't be too intrusive. i can put that up today, but if it sounds like something i should put up an issue for first, i can do that first.