+external write_bitcode_file
+ : Llvm.llmodule -> string -> bool
+ = "llvm_write_bitcode_file"
+
+(** [write_bitcode_to_fd ~unbuffered fd m] writes the bitcode for module
+ [m] to the channel [c]. If [unbuffered] is [true], after every write the fd
+ will be flushed. Returns [true] if successful, [false] otherwise. *)
+external write_bitcode_to_fd
+ : ?unbuffered:bool -> Llvm.llmodule -> Unix.file_descr -> bool
+ = "llvm_write_bitcode_to_fd"
+
+(** [write_bitcode_to_memory_buffer m] returns a memory buffer containing
+ the bitcode for module [m]. *)
+external write_bitcode_to_memory_buffer
+ : Llvm.llmodule -> Llvm.llmemorybuffer
+ = "llvm_write_bitcode_to_memory_buffer"
+
+(** [output_bitcode ~unbuffered c m] writes the bitcode for module [m]
+ to the channel [c]. If [unbuffered] is [true], after every write the fd
+ will be flushed. Returns [true] if successful, [false] otherwise. *)
+val output_bitcode : ?unbuffered:bool -> out_channel -> Llvm.llmodule -> bool