2 dnl Copyright (C) 2009-2011 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
7 dnl This file must be named something that sorts before all other
8 dnl gnulib-provided .m4 files. It is needed until such time as we can
9 dnl assume Autoconf 2.64, with its improved AC_DEFUN_ONCE semantics.
11 # AC_DEFUN_ONCE([NAME], VALUE)
12 # ----------------------------
13 # Define NAME to expand to VALUE on the first use (whether by direct
14 # expansion, or by AC_REQUIRE), and to nothing on all subsequent uses.
15 # Avoid bugs in AC_REQUIRE in Autoconf 2.63 and earlier. This
16 # definition is slower than the version in Autoconf 2.64, because it
17 # can only use interfaces that existed since 2.59; but it achieves the
18 # same effect. Quoting is necessary to avoid confusing Automake.
19 m4_version_prereq([2.63.263], [],
20 [m4_define([AC][_DEFUN_ONCE],
22 [AC_REQUIRE([_gl_DEFUN_ONCE([$1])],
23 [m4_indir([_gl_DEFUN_ONCE([$1])])])])]dnl
24 [AC][_DEFUN([_gl_DEFUN_ONCE([$1])], [$2])])])
28 # Witness macro that this file has been included. Needed to force
29 # Automake to include this file prior to all other gnulib .m4 files.
30 AC_DEFUN([gl_00GNULIB])