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47 lines
2.1 KiB
Plaintext
47 lines
2.1 KiB
Plaintext
# 00gnulib.m4 serial 3
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dnl Copyright (C) 2009-2020 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl This file must be named something that sorts before all other
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dnl gnulib-provided .m4 files. It is needed until such time as we can
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dnl assume Autoconf 2.64, with its improved AC_DEFUN_ONCE and
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dnl m4_divert semantics.
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# Until autoconf 2.63, handling of the diversion stack required m4_init
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# to be called first; but this does not happen with aclocal. Wrapping
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# the entire execution in another layer of the diversion stack fixes this.
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# Worse, prior to autoconf 2.62, m4_wrap depended on the underlying m4
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# for whether it was FIFO or LIFO; in order to properly balance with
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# m4_init, we need to undo our push just before anything wrapped within
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# the m4_init body. The way to ensure this is to wrap both sides of
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# m4_init with a one-shot macro that does the pop at the right time.
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m4_ifndef([_m4_divert_diversion],
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[m4_divert_push([KILL])
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m4_define([gl_divert_fixup], [m4_divert_pop()m4_define([$0])])
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m4_define([m4_init],
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[gl_divert_fixup()]m4_defn([m4_init])[gl_divert_fixup()])])
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# AC_DEFUN_ONCE([NAME], VALUE)
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# ----------------------------
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# Define NAME to expand to VALUE on the first use (whether by direct
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# expansion, or by AC_REQUIRE), and to nothing on all subsequent uses.
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# Avoid bugs in AC_REQUIRE in Autoconf 2.63 and earlier. This
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# definition is slower than the version in Autoconf 2.64, because it
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# can only use interfaces that existed since 2.59; but it achieves the
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# same effect. Quoting is necessary to avoid confusing Automake.
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m4_version_prereq([2.63.263], [],
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[m4_define([AC][_DEFUN_ONCE],
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[AC][_DEFUN([$1],
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[AC_REQUIRE([_gl_DEFUN_ONCE([$1])],
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[m4_indir([_gl_DEFUN_ONCE([$1])])])])]dnl
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[AC][_DEFUN([_gl_DEFUN_ONCE([$1])], [$2])])])
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# gl_00GNULIB
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# -----------
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# Witness macro that this file has been included. Needed to force
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# Automake to include this file prior to all other gnulib .m4 files.
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AC_DEFUN([gl_00GNULIB])
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