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diff --git a/contrib/llvm/bindings/ocaml/bitwriter/llvm_bitwriter.mli b/contrib/llvm/bindings/ocaml/bitwriter/llvm_bitwriter.mli
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+++ b/contrib/llvm/bindings/ocaml/bitwriter/llvm_bitwriter.mli
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+(*===-- llvm_bitwriter.mli - LLVM Ocaml Interface ---------------*- C++ -*-===*
+ *
+ *                     The LLVM Compiler Infrastructure
+ *
+ * This file is distributed under the University of Illinois Open Source
+ * License. See LICENSE.TXT for details.
+ *
+ *===----------------------------------------------------------------------===*)
+
+(** Bitcode writer.
+
+    This interface provides an ocaml API for the LLVM bitcode writer, the
+    classes in the Bitwriter library. *)
+
+(** [write_bitcode_file m path] writes the bitcode for module [m] to the file at
+    [path]. Returns [true] if successful, [false] otherwise. *)
+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"
+
+(** [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