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autoupdate.m4
# This file is part of Autoconf. -*- Autoconf -*- # Interface with autoupdate. # Copyright (C) 1992-1996, 1998-2001, 2003-2004, 2006, 2009-2012 Free # Software Foundation, Inc. # This file is part of Autoconf. 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 3 of the License, 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. # # Under Section 7 of GPL version 3, you are granted additional # permissions described in the Autoconf Configure Script Exception, # version 3.0, as published by the Free Software Foundation. # # You should have received a copy of the GNU General Public License # and a copy of the Autoconf Configure Script Exception along with # this program; see the files COPYINGv3 and COPYING.EXCEPTION # respectively. If not, see <http://www.gnu.org/licenses/>. # 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 aesthetic 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@)])]])
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