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  1. # ===========================================================================
  2. # https://www.gnu.org/software/autoconf-archive/ax_require_defined.html
  3. # ===========================================================================
  4. #
  5. # SYNOPSIS
  6. #
  7. # AX_REQUIRE_DEFINED(MACRO)
  8. #
  9. # DESCRIPTION
  10. #
  11. # AX_REQUIRE_DEFINED is a simple helper for making sure other macros have
  12. # been defined and thus are available for use. This avoids random issues
  13. # where a macro isn't expanded. Instead the configure script emits a
  14. # non-fatal:
  15. #
  16. # ./configure: line 1673: AX_CFLAGS_WARN_ALL: command not found
  17. #
  18. # It's like AC_REQUIRE except it doesn't expand the required macro.
  19. #
  20. # Here's an example:
  21. #
  22. # AX_REQUIRE_DEFINED([AX_CHECK_LINK_FLAG])
  23. #
  24. # LICENSE
  25. #
  26. # Copyright (c) 2014 Mike Frysinger <vapier@gentoo.org>
  27. #
  28. # Copying and distribution of this file, with or without modification, are
  29. # permitted in any medium without royalty provided the copyright notice
  30. # and this notice are preserved. This file is offered as-is, without any
  31. # warranty.
  32. #serial 2
  33. AC_DEFUN([AX_REQUIRE_DEFINED], [dnl
  34. m4_ifndef([$1], [m4_fatal([macro ]$1[ is not defined; is a m4 file missing?])])
  35. ])dnl AX_REQUIRE_DEFINED