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Annotation of embedaddon/libiconv/srcm4/00gnulib.m4, revision 1.1.1.3

1.1.1.3 ! misho       1: # 00gnulib.m4 serial 3
        !             2: dnl Copyright (C) 2009-2019 Free Software Foundation, Inc.
1.1       misho       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
1.1.1.3 ! misho       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: 
1.1       misho      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])