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ax_append_link_flags.m4 2.9 KB

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  1. # ===========================================================================
  2. # https://www.gnu.org/software/autoconf-archive/ax_append_link_flags.html
  3. # ===========================================================================
  4. #
  5. # SYNOPSIS
  6. #
  7. # AX_APPEND_LINK_FLAGS([FLAG1 FLAG2 ...], [FLAGS-VARIABLE], [EXTRA-FLAGS], [INPUT])
  8. #
  9. # DESCRIPTION
  10. #
  11. # For every FLAG1, FLAG2 it is checked whether the linker works with the
  12. # flag. If it does, the flag is added FLAGS-VARIABLE
  13. #
  14. # If FLAGS-VARIABLE is not specified, the linker's flags (LDFLAGS) is
  15. # used. During the check the flag is always added to the linker's flags.
  16. #
  17. # If EXTRA-FLAGS is defined, it is added to the linker's default flags
  18. # when the check is done. The check is thus made with the flags: "LDFLAGS
  19. # EXTRA-FLAGS FLAG". This can for example be used to force the linker to
  20. # issue an error when a bad flag is given.
  21. #
  22. # INPUT gives an alternative input source to AC_COMPILE_IFELSE.
  23. #
  24. # NOTE: This macro depends on the AX_APPEND_FLAG and AX_CHECK_LINK_FLAG.
  25. # Please keep this macro in sync with AX_APPEND_COMPILE_FLAGS.
  26. #
  27. # LICENSE
  28. #
  29. # Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
  30. #
  31. # This program is free software: you can redistribute it and/or modify it
  32. # under the terms of the GNU General Public License as published by the
  33. # Free Software Foundation, either version 3 of the License, or (at your
  34. # option) any later version.
  35. #
  36. # This program is distributed in the hope that it will be useful, but
  37. # WITHOUT ANY WARRANTY; without even the implied warranty of
  38. # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
  39. # Public License for more details.
  40. #
  41. # You should have received a copy of the GNU General Public License along
  42. # with this program. If not, see <https://www.gnu.org/licenses/>.
  43. #
  44. # As a special exception, the respective Autoconf Macro's copyright owner
  45. # gives unlimited permission to copy, distribute and modify the configure
  46. # scripts that are the output of Autoconf when processing the Macro. You
  47. # need not follow the terms of the GNU General Public License when using
  48. # or distributing such scripts, even though portions of the text of the
  49. # Macro appear in them. The GNU General Public License (GPL) does govern
  50. # all other use of the material that constitutes the Autoconf Macro.
  51. #
  52. # This special exception to the GPL applies to versions of the Autoconf
  53. # Macro released by the Autoconf Archive. When you make and distribute a
  54. # modified version of the Autoconf Macro, you may extend this special
  55. # exception to the GPL to apply to your modified version as well.
  56. #serial 6
  57. AC_DEFUN([AX_APPEND_LINK_FLAGS],
  58. [AX_REQUIRE_DEFINED([AX_CHECK_LINK_FLAG])
  59. AX_REQUIRE_DEFINED([AX_APPEND_FLAG])
  60. for flag in $1; do
  61. AX_CHECK_LINK_FLAG([$flag], [AX_APPEND_FLAG([$flag], [m4_default([$2], [LDFLAGS])])], [], [$3], [$4])
  62. done
  63. ])dnl AX_APPEND_LINK_FLAGS