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1# 00gnulib.m4 serial 2
2dnl Copyright (C) 2009-2011 Free Software Foundation, Inc.
3dnl This file is free software; the Free Software Foundation
4dnl gives unlimited permission to copy and/or distribute it,
5dnl with or without modifications, as long as this notice is preserved.
6
7dnl This file must be named something that sorts before all other
8dnl gnulib-provided .m4 files. It is needed until such time as we can
9dnl assume Autoconf 2.64, with its improved AC_DEFUN_ONCE semantics.
10
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.
19m4_version_prereq([2.63.263], [],
20[m4_define([AC][_DEFUN_ONCE],
21 [AC][_DEFUN([$1],
22 [AC_REQUIRE([_gl_DEFUN_ONCE([$1])],
23 [m4_indir([_gl_DEFUN_ONCE([$1])])])])]dnl
24[AC][_DEFUN([_gl_DEFUN_ONCE([$1])], [$2])])])
25
26# gl_00GNULIB
27# -----------
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.
30AC_DEFUN([gl_00GNULIB])