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//usr/local/ssl/share/autoconf/autoconf/autoupdate.m4
# This file is part of Autoconf. -*- Autoconf -*- # Interface with autoupdate. # Copyright (C) 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, # 2003, 2004, 2006 Free Software Foundation, Inc. # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2, or (at your option) # any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA # 02110-1301, USA. # As a special exception, the Free Software Foundation gives unlimited # permission to copy, distribute and modify the configure scripts that # are the output of Autoconf. You need not follow the terms of the GNU # General Public License when using or distributing such scripts, even # though portions of the text of Autoconf appear in them. The GNU # General Public License (GPL) does govern all other use of the material # that constitutes the Autoconf program. # # Certain portions of the Autoconf source text are designed to be copied # (in certain cases, depending on the input) into the output of # Autoconf. We call these the "data" portions. The rest of the Autoconf # source text consists of comments plus executable code that decides which # of the data portions to output in any given case. We call these # comments and executable code the "non-data" portions. Autoconf never # copies any of the non-data portions into its output. # # This special exception to the GPL applies to versions of Autoconf # released by the Free Software Foundation. When you make and # distribute a modified version of Autoconf, you may extend this special # exception to the GPL to apply to your modified version as well, *unless* # your modified version has the potential to copy into its output some # of the text that was the non-data portion of the version that you started # with. (In other words, unless your change moves or copies text from # the non-data portions to the data portions.) If your modification has # such potential, you must delete any notice of this special exception # to the GPL from your modified version. # # Written by David MacKenzie, with help from # Franc,ois Pinard, Karl Berry, Richard Pixley, Ian Lance Taylor, # Roland McGrath, Noah Friedman, david d zuhn, and many others. ## ---------------------------------- ## ## Macros to define obsolete macros. ## ## ---------------------------------- ## # AU_DEFINE(NAME, CODE) # --------------------- # Define the macro NAME so that it expand to CODE only when # autoupdate is running. This is achieved with traces in # autoupdate itself, so this macro expands to nothing. # m4_define([AU_DEFINE], []) # AU_DEFUN(NAME, NEW-CODE, [MESSAGE]) # ----------------------------------- # Declare that the macro NAME is now obsoleted, and should be replaced # by NEW-CODE. Tell the user she should run autoupdate, and when # autoupdate is run, emit MESSAGE as a warning and include it in # the updated configure.ac file. # # Also define NAME as a macro which code is NEW-CODE. # # This allows sharing the same code for both supporting obsoleted macros, # and to update a configure.ac. # See the end of `autoupdate.in' for a longer description. m4_define([AU_DEFUN], [# This is what autoupdate's m4 run will expand. It fires # the warning (with _au_warn_XXX), outputs it into the # updated configure.ac (with AC_DIAGNOSE), and then outputs # the replacement expansion. AU_DEFINE([$1], [m4_ifval([$3], [_au_warn_$1([$3])AC_DIAGNOSE([obsolete], [$3])d[]nl ])dnl $2]) # This is an auxiliary macro that is also run when # autoupdate runs m4. It simply calls m4_warning, but # we need a wrapper so that each warning is emitted only # once. We break the quoting in m4_warning's argument in # order to expand this macro's arguments, not AU_DEFUN's. AU_DEFINE([_au_warn_$1], [m4_warning($][@)dnl m4_define([_au_warn_$1], [])]) # Finally, this is the expansion that is picked up by # autoconf. It tells the user to run autoupdate, and # then outputs the replacement expansion. We do not care # about autoupdate's warning because that contains # information on what to do *after* running autoupdate. AC_DEFUN([$1], [AC_DIAGNOSE([obsolete], [The macro `$1' is obsolete. You should run autoupdate.])dnl $2])]) # AU_ALIAS(OLD-NAME, NEW-NAME) # ---------------------------- # The OLD-NAME is no longer used, just use NEW-NAME instead. There is # little difference with using AU_DEFUN but the fact there is little # interest in running the test suite on both OLD-NAME and NEW-NAME. # This macro makes it possible to distinguish such cases. # # Do not use `defn' since then autoupdate would replace an old macro # call with the new macro body instead of the new macro call. # # Moreover, we have to take care that calls without parameters are # expanded to calls without parameters, not with one empty parameter. # This is not only an aesthetical improvement of autoupdate, it also # matters with poorly written macros which test for $# = 0. # m4_define([AU_ALIAS], [AU_DEFUN([$1], _AU_ALIAS_BODY([$], [$2]))]) # The body for the AU_DEFUN above should look like: # [m4_if($#, 0, [NEW-NAME], [NEW-NAME($@)])] # Thus the helper macro is: m4_define([_AU_ALIAS_BODY], [[m4_if($1#, 0, [$2], [$2($1@)])]])
