Preprocessor.ml 3.0 KB

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  1. (*
  2. * Copyright (C) 2011-2017 Intel Corporation. All rights reserved.
  3. *
  4. * Redistribution and use in source and binary forms, with or without
  5. * modification, are permitted provided that the following conditions
  6. * are met:
  7. *
  8. * * Redistributions of source code must retain the above copyright
  9. * notice, this list of conditions and the following disclaimer.
  10. * * Redistributions in binary form must reproduce the above copyright
  11. * notice, this list of conditions and the following disclaimer in
  12. * the documentation and/or other materials provided with the
  13. * distribution.
  14. * * Neither the name of Intel Corporation nor the names of its
  15. * contributors may be used to endorse or promote products derived
  16. * from this software without specific prior written permission.
  17. *
  18. * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19. * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20. * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  21. * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  22. * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  23. * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  24. * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25. * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26. * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27. * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  28. * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29. *
  30. *)
  31. open Unix
  32. open Printf
  33. open Util
  34. (* for compat of OCaml before version 4.02.0 *)
  35. module Bytes = String
  36. (* Run a command and return its results as a process_status*string. *)
  37. let read_process (command : string) : Unix.process_status * string =
  38. let buffer_size = 2048 in
  39. let buffer = Buffer.create buffer_size in
  40. let str = Bytes.create buffer_size in
  41. let in_channel = Unix.open_process_in command in
  42. let chars_read = ref 1 in
  43. while !chars_read <> 0 do
  44. chars_read := input in_channel str 0 buffer_size;
  45. Buffer.add_substring buffer str 0 !chars_read
  46. done;
  47. let status = Unix.close_process_in in_channel in
  48. let output = Buffer.contents buffer in
  49. ( status, output )
  50. (*Return None if gcc not found, caller should handle it*)
  51. let processor_macro ( full_path : string) : string option=
  52. let gcc_path = snd (read_process "which gcc") in
  53. if not (String.contains gcc_path '/' ) then
  54. (eprintf "warning: preprocessor is not found\n"; None)
  55. else
  56. let command = sprintf "gcc -x c -E -P \"%s\" 2>/dev/null" full_path in
  57. let output = read_process command in
  58. match fst output with
  59. | WEXITED exit_status ->
  60. if exit_status < 0 then
  61. failwithf "gcc exited with error code 0x%d\n" exit_status
  62. else if exit_status > 0 then
  63. failwithf "Preprocessor failed\n"
  64. else
  65. Some(snd output)
  66. | _ -> failwithf "Preprocessor stopped by signal\n"