expose internal copy target

ya-build

@@ -233,6 +233,19 @@ class AliasTarget < Target
 	end
 end
 
+class CopyTarget < Target
+	def initialize(dest, src)
+		super(dest, [src])
+	end
+
+	protected def dump_rules_impl(buf)
+	end
+
+	def mode()
+		"COPY"
+	end
+end
+
 class Configurator
 	attr_reader :root_src, :root_build, :config, :all
 
@@ -471,6 +484,11 @@ EOF
 		return_target(trg, &blk)
 	end
 
+	def target_copy(dest:, src:, &blk)
+		trg = CopyTarget.new(dest, src)
+		return_target(trg, &blk)
+	end
+
 	def target_c(output_file:, mode:, root_dir: nil, file: nil, objs: nil, flags: nil, cc: nil, &blk)
 		if (mode == "compile") == file.nil?
 			raise "file must be provided only for compile"