m4/ax_require_defined.m4

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