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  1. # ===========================================================================
  2. # http://www.nongnu.org/autoconf-archive/ax_check_compiler_flags.html
  3. # ===========================================================================
  4. #
  5. # SYNOPSIS
  6. #
  7. # AX_CHECK_COMPILER_FLAGS(FLAGS, [ACTION-SUCCESS], [ACTION-FAILURE])
  8. #
  9. # DESCRIPTION
  10. #
  11. # Check whether the given compiler FLAGS work with the current language's
  12. # compiler, or whether they give an error. (Warnings, however, are
  13. # ignored.)
  14. #
  15. # ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
  16. # success/failure.
  17. #
  18. # LICENSE
  19. #
  20. # Copyright (c) 2009 Steven G. Johnson <stevenj@alum.mit.edu>
  21. # Copyright (c) 2009 Matteo Frigo
  22. #
  23. # This program is free software: you can redistribute it and/or modify it
  24. # under the terms of the GNU General Public License as published by the
  25. # Free Software Foundation, either version 3 of the License, or (at your
  26. # option) any later version.
  27. #
  28. # This program is distributed in the hope that it will be useful, but
  29. # WITHOUT ANY WARRANTY; without even the implied warranty of
  30. # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
  31. # Public License for more details.
  32. #
  33. # You should have received a copy of the GNU General Public License along
  34. # with this program. If not, see <http://www.gnu.org/licenses/>.
  35. #
  36. # As a special exception, the respective Autoconf Macro's copyright owner
  37. # gives unlimited permission to copy, distribute and modify the configure
  38. # scripts that are the output of Autoconf when processing the Macro. You
  39. # need not follow the terms of the GNU General Public License when using
  40. # or distributing such scripts, even though portions of the text of the
  41. # Macro appear in them. The GNU General Public License (GPL) does govern
  42. # all other use of the material that constitutes the Autoconf Macro.
  43. #
  44. # This special exception to the GPL applies to versions of the Autoconf
  45. # Macro released by the Autoconf Archive. When you make and distribute a
  46. # modified version of the Autoconf Macro, you may extend this special
  47. # exception to the GPL to apply to your modified version as well.
  48. AC_DEFUN([AX_CHECK_COMPILER_FLAGS],
  49. [AC_PREREQ(2.59) dnl for _AC_LANG_PREFIX
  50. AC_MSG_CHECKING([whether _AC_LANG compiler accepts $1])
  51. dnl Some hackery here since AC_CACHE_VAL can't handle a non-literal varname:
  52. AS_LITERAL_IF([$1],
  53. [AC_CACHE_VAL(AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1]), [
  54. ax_save_FLAGS=$[]_AC_LANG_PREFIX[]FLAGS
  55. _AC_LANG_PREFIX[]FLAGS="$1"
  56. AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
  57. AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])=yes,
  58. AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])=no)
  59. _AC_LANG_PREFIX[]FLAGS=$ax_save_FLAGS])],
  60. [ax_save_FLAGS=$[]_AC_LANG_PREFIX[]FLAGS
  61. _AC_LANG_PREFIX[]FLAGS="$1"
  62. AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
  63. eval AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])=yes,
  64. eval AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])=no)
  65. _AC_LANG_PREFIX[]FLAGS=$ax_save_FLAGS])
  66. eval ax_check_compiler_flags=$AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_[$1])
  67. AC_MSG_RESULT($ax_check_compiler_flags)
  68. if test "x$ax_check_compiler_flags" = xyes; then
  69. m4_default([$2], :)
  70. else
  71. m4_default([$3], :)
  72. fi
  73. ])dnl AX_CHECK_COMPILER_FLAGS