Compenv
val first_ccopts : string list ref
val first_ppx : string list ref
val first_include_dirs : string list ref
val last_include_dirs : string list ref
val last_objfiles : string list ref
val first_objfiles : string list ref
val stop_early : bool ref
val readenv : Format.formatter -> readenv_position -> unit
val defer : deferred_action -> unit
val process_deferred_actions : (Format.formatter * (start_from:Clflags.Compiler_pass.t -> source_file:string ->
output_prefix:string -> unit) * (source_file:string -> output_prefix:string ->
unit) * string * string) -> unit