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ax_append_compile_flags.m4 2.9 KB

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  1. # ============================================================================
  2. # https://www.gnu.org/software/autoconf-archive/ax_append_compile_flags.html
  3. # ============================================================================
  4. #
  5. # SYNOPSIS
  6. #
  7. # AX_APPEND_COMPILE_FLAGS([FLAG1 FLAG2 ...], [FLAGS-VARIABLE], [EXTRA-FLAGS], [INPUT])
  8. #
  9. # DESCRIPTION
  10. #
  11. # For every FLAG1, FLAG2 it is checked whether the compiler works with the
  12. # flag. If it does, the flag is added FLAGS-VARIABLE
  13. #
  14. # If FLAGS-VARIABLE is not specified, the current language's flags (e.g.
  15. # CFLAGS) is used. During the check the flag is always added to the
  16. # current language's flags.
  17. #
  18. # If EXTRA-FLAGS is defined, it is added to the current language's default
  19. # flags (e.g. CFLAGS) when the check is done. The check is thus made with
  20. # the flags: "CFLAGS EXTRA-FLAGS FLAG". This can for example be used to
  21. # force the compiler to issue an error when a bad flag is given.
  22. #
  23. # INPUT gives an alternative input source to AC_COMPILE_IFELSE.
  24. #
  25. # NOTE: This macro depends on the AX_APPEND_FLAG and
  26. # AX_CHECK_COMPILE_FLAG. Please keep this macro in sync with
  27. # AX_APPEND_LINK_FLAGS.
  28. #
  29. # LICENSE
  30. #
  31. # Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
  32. #
  33. # This program is free software: you can redistribute it and/or modify it
  34. # under the terms of the GNU General Public License as published by the
  35. # Free Software Foundation, either version 3 of the License, or (at your
  36. # option) any later version.
  37. #
  38. # This program is distributed in the hope that it will be useful, but
  39. # WITHOUT ANY WARRANTY; without even the implied warranty of
  40. # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
  41. # Public License for more details.
  42. #
  43. # You should have received a copy of the GNU General Public License along
  44. # with this program. If not, see <https://www.gnu.org/licenses/>.
  45. #
  46. # As a special exception, the respective Autoconf Macro's copyright owner
  47. # gives unlimited permission to copy, distribute and modify the configure
  48. # scripts that are the output of Autoconf when processing the Macro. You
  49. # need not follow the terms of the GNU General Public License when using
  50. # or distributing such scripts, even though portions of the text of the
  51. # Macro appear in them. The GNU General Public License (GPL) does govern
  52. # all other use of the material that constitutes the Autoconf Macro.
  53. #
  54. # This special exception to the GPL applies to versions of the Autoconf
  55. # Macro released by the Autoconf Archive. When you make and distribute a
  56. # modified version of the Autoconf Macro, you may extend this special
  57. # exception to the GPL to apply to your modified version as well.
  58. #serial 6
  59. AC_DEFUN([AX_APPEND_COMPILE_FLAGS],
  60. [AX_REQUIRE_DEFINED([AX_CHECK_COMPILE_FLAG])
  61. AX_REQUIRE_DEFINED([AX_APPEND_FLAG])
  62. for flag in $1; do
  63. AX_CHECK_COMPILE_FLAG([$flag], [AX_APPEND_FLAG([$flag], [$2])], [], [$3], [$4])
  64. done
  65. ])dnl AX_APPEND_COMPILE_FLAGS