source: trunk/m4/ax_require_defined.m4

Last change on this file was 3720, checked in by Peter, 4 years ago

update to autoconf-archive 2017.09.28

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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
33#serial 2
34
35AC_DEFUN([AX_REQUIRE_DEFINED], [dnl
36  m4_ifndef([$1], [m4_fatal([macro ]$1[ is not defined; is a m4 file missing?])])
37])dnl AX_REQUIRE_DEFINED
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