m4/ax_require_defined.m4

   1 # SPDX-License-Identifier: FSFAP
   2 #
   3 # ===========================================================================
   4 #    https://www.gnu.org/software/autoconf-archive/ax_require_defined.html
   5 # ===========================================================================
   6 #
   7 # SYNOPSIS
   8 #
   9 #   AX_REQUIRE_DEFINED(MACRO)
  10 #
  11 # DESCRIPTION
  12 #
  13 #   AX_REQUIRE_DEFINED is a simple helper for making sure other macros have
  14 #   been defined and thus are available for use.  This avoids random issues
  15 #   where a macro isn't expanded.  Instead the configure script emits a
  16 #   non-fatal:
  17 #
  18 #     ./configure: line 1673: AX_CFLAGS_WARN_ALL: command not found
  19 #
  20 #   It's like AC_REQUIRE except it doesn't expand the required macro.
  21 #
  22 #   Here's an example:
  23 #
  24 #     AX_REQUIRE_DEFINED([AX_CHECK_LINK_FLAG])
  25 #
  26 # LICENSE
  27 #
  28 #   Copyright (c) 2014 Mike Frysinger <vapier@gentoo.org>
  29 #
  30 #   Copying and distribution of this file, with or without modification, are
  31 #   permitted in any medium without royalty provided the copyright notice
  32 #   and this notice are preserved. This file is offered as-is, without any
  33 #   warranty.
  34
  35 #serial 2
  36
  37 AC_DEFUN([AX_REQUIRE_DEFINED], [dnl
  38   m4_ifndef([$1], [m4_fatal([macro ]$1[ is not defined; is a m4 file missing?])])
  39 ])dnl AX_REQUIRE_DEFINED