class RbSys::CargoBuilder

def rustc_dynamic_linker_flags(dest_dir) 

def rustc_dynamic_linker_flags(dest_dir)
  split_flags("DLDFLAGS")
    .map { |arg| maybe_resolve_ldflag_variable(arg, dest_dir) }
    .compact
    .flat_map { |arg| ldflag_to_link_modifier(arg) }
end