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[urcu.git] / m4 / ax_require_defined.m4
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
35 AC_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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