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libiconv 1.16

    1: # 00gnulib.m4 serial 3
    2: dnl Copyright (C) 2009-2019 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.
    6: 
    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 and
   10: dnl m4_divert semantics.
   11: 
   12: # Until autoconf 2.63, handling of the diversion stack required m4_init
   13: # to be called first; but this does not happen with aclocal.  Wrapping
   14: # the entire execution in another layer of the diversion stack fixes this.
   15: # Worse, prior to autoconf 2.62, m4_wrap depended on the underlying m4
   16: # for whether it was FIFO or LIFO; in order to properly balance with
   17: # m4_init, we need to undo our push just before anything wrapped within
   18: # the m4_init body.  The way to ensure this is to wrap both sides of
   19: # m4_init with a one-shot macro that does the pop at the right time.
   20: m4_ifndef([_m4_divert_diversion],
   21: [m4_divert_push([KILL])
   22: m4_define([gl_divert_fixup], [m4_divert_pop()m4_define([$0])])
   23: m4_define([m4_init],
   24:   [gl_divert_fixup()]m4_defn([m4_init])[gl_divert_fixup()])])
   25: 
   26: 
   27: # AC_DEFUN_ONCE([NAME], VALUE)
   28: # ----------------------------
   29: # Define NAME to expand to VALUE on the first use (whether by direct
   30: # expansion, or by AC_REQUIRE), and to nothing on all subsequent uses.
   31: # Avoid bugs in AC_REQUIRE in Autoconf 2.63 and earlier.  This
   32: # definition is slower than the version in Autoconf 2.64, because it
   33: # can only use interfaces that existed since 2.59; but it achieves the
   34: # same effect.  Quoting is necessary to avoid confusing Automake.
   35: m4_version_prereq([2.63.263], [],
   36: [m4_define([AC][_DEFUN_ONCE],
   37:   [AC][_DEFUN([$1],
   38:     [AC_REQUIRE([_gl_DEFUN_ONCE([$1])],
   39:       [m4_indir([_gl_DEFUN_ONCE([$1])])])])]dnl
   40: [AC][_DEFUN([_gl_DEFUN_ONCE([$1])], [$2])])])
   41: 
   42: # gl_00GNULIB
   43: # -----------
   44: # Witness macro that this file has been included.  Needed to force
   45: # Automake to include this file prior to all other gnulib .m4 files.
   46: AC_DEFUN([gl_00GNULIB])