X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;ds=sidebyside;f=m4%2Fonceonly.m4;h=0a875a3d96877a270bcd896f45be974cb2ad161c;hb=d2ea75707993cf1172a5b99213e7b2051586cb4a;hp=af56aa94484661e3adc151f26b52c77eb1a07606;hpb=4b7d3c8dd9977670c2b612608578fe1edb713f93;p=gnulib.git diff --git a/m4/onceonly.m4 b/m4/onceonly.m4 index af56aa944..0a875a3d9 100644 --- a/m4/onceonly.m4 +++ b/m4/onceonly.m4 @@ -1,16 +1,30 @@ -# onceonly.m4 serial 2 -dnl Copyright (C) 2002, 2003 Free Software Foundation, Inc. -dnl This file is free software, distributed under the terms of the GNU -dnl General Public License. As a special exception to the GNU General -dnl Public License, this file may be distributed as part of a program +# onceonly.m4 serial 9 +dnl Copyright (C) 2002-2003, 2005-2006, 2008-2013 Free Software Foundation, +dnl Inc. +dnl +dnl This file is free software; you can redistribute it and/or modify +dnl it under the terms of the GNU General Public License as published by +dnl the Free Software Foundation; either version 3 of the License, or +dnl (at your option) any later version. +dnl +dnl This file is distributed in the hope that it will be useful, +dnl but WITHOUT ANY WARRANTY; without even the implied warranty of +dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +dnl GNU General Public License for more details. +dnl +dnl You should have received a copy of the GNU General Public License +dnl along with this file. If not, see . +dnl +dnl As a special exception to the GNU General Public License, +dnl this file may be distributed as part of a program dnl that contains a configuration script generated by Autoconf, under dnl the same distribution terms as the rest of that program. dnl This file defines some "once only" variants of standard autoconf macros. -dnl AC_CHECK_HEADERS_ONCE like AC_CHECK_HEADERS -dnl AC_CHECK_FUNCS_ONCE like AC_CHECK_FUNCS -dnl AC_CHECK_DECLS_ONCE like AC_CHECK_DECLS -dnl AC_REQUIRE([AC_HEADER_STDC]) like AC_HEADER_STDC +dnl AC_CHECK_HEADERS_ONCE like AC_CHECK_HEADERS +dnl AC_CHECK_FUNCS_ONCE like AC_CHECK_FUNCS +dnl AC_CHECK_DECLS_ONCE like AC_CHECK_DECLS +dnl AC_REQUIRE([AC_FUNC_STRCOLL]) like AC_FUNC_STRCOLL dnl The advantage is that the check for each of the headers/functions/decls dnl will be put only once into the 'configure' file. It keeps the size of dnl the 'configure' file down, and avoids redundant output when 'configure' @@ -21,43 +35,70 @@ dnl inside an AC_DEFUNed function, the gl_CHECK_HEADERS macro call expands to dnl empty, and the check will be inserted before the body of the AC_DEFUNed dnl function. -dnl Taken from Autoconf 2.50; can be removed once we assume 2.50 or later. -define([m4_quote], [[$*]]) +dnl The original code implemented AC_CHECK_HEADERS_ONCE and AC_CHECK_FUNCS_ONCE +dnl in terms of AC_DEFUN and AC_REQUIRE. This implementation uses diversions to +dnl named sections DEFAULTS and INIT_PREPARE in order to check all requested +dnl headers at once, thus reducing the size of 'configure'. It is known to work +dnl with autoconf 2.57..2.62 at least . The size reduction is ca. 9%. + +dnl Autoconf version 2.59 plus gnulib is required; this file is not needed +dnl with Autoconf 2.60 or greater. But note that autoconf's implementation of +dnl AC_CHECK_DECLS_ONCE expects a comma-separated list of symbols as first +dnl argument! +AC_PREREQ([2.59]) # AC_CHECK_HEADERS_ONCE(HEADER1 HEADER2 ...) is a once-only variant of # AC_CHECK_HEADERS(HEADER1 HEADER2 ...). AC_DEFUN([AC_CHECK_HEADERS_ONCE], [ : - AC_FOREACH([gl_HEADER_NAME], [$1], [ - AC_DEFUN([gl_CHECK_HEADER_]m4_quote(translit(defn([gl_HEADER_NAME]), - [-./], [___])), [ - AC_CHECK_HEADERS(gl_HEADER_NAME) + m4_foreach_w([gl_HEADER_NAME], [$1], [ + AC_DEFUN([gl_CHECK_HEADER_]m4_quote(m4_translit(gl_HEADER_NAME, + [./-], [___])), [ + m4_divert_text([INIT_PREPARE], + [gl_header_list="$gl_header_list gl_HEADER_NAME"]) + gl_HEADERS_EXPANSION + AH_TEMPLATE(AS_TR_CPP([HAVE_]m4_defn([gl_HEADER_NAME])), + [Define to 1 if you have the <]m4_defn([gl_HEADER_NAME])[> header file.]) ]) - AC_REQUIRE([gl_CHECK_HEADER_]m4_quote(translit(gl_HEADER_NAME, - [-./], [___]))) + AC_REQUIRE([gl_CHECK_HEADER_]m4_quote(m4_translit(gl_HEADER_NAME, + [./-], [___]))) ]) ]) +m4_define([gl_HEADERS_EXPANSION], [ + m4_divert_text([DEFAULTS], [gl_header_list=]) + AC_CHECK_HEADERS([$gl_header_list]) + m4_define([gl_HEADERS_EXPANSION], []) +]) # AC_CHECK_FUNCS_ONCE(FUNC1 FUNC2 ...) is a once-only variant of # AC_CHECK_FUNCS(FUNC1 FUNC2 ...). AC_DEFUN([AC_CHECK_FUNCS_ONCE], [ : - AC_FOREACH([gl_FUNC_NAME], [$1], [ - AC_DEFUN([gl_CHECK_FUNC_]defn([gl_FUNC_NAME]), [ - AC_CHECK_FUNCS(defn([gl_FUNC_NAME])) + m4_foreach_w([gl_FUNC_NAME], [$1], [ + AC_DEFUN([gl_CHECK_FUNC_]m4_defn([gl_FUNC_NAME]), [ + m4_divert_text([INIT_PREPARE], + [gl_func_list="$gl_func_list gl_FUNC_NAME"]) + gl_FUNCS_EXPANSION + AH_TEMPLATE(AS_TR_CPP([HAVE_]m4_defn([gl_FUNC_NAME])), + [Define to 1 if you have the ']m4_defn([gl_FUNC_NAME])[' function.]) ]) - AC_REQUIRE([gl_CHECK_FUNC_]defn([gl_FUNC_NAME])) + AC_REQUIRE([gl_CHECK_FUNC_]m4_defn([gl_FUNC_NAME])) ]) ]) +m4_define([gl_FUNCS_EXPANSION], [ + m4_divert_text([DEFAULTS], [gl_func_list=]) + AC_CHECK_FUNCS([$gl_func_list]) + m4_define([gl_FUNCS_EXPANSION], []) +]) # AC_CHECK_DECLS_ONCE(DECL1 DECL2 ...) is a once-only variant of # AC_CHECK_DECLS(DECL1, DECL2, ...). AC_DEFUN([AC_CHECK_DECLS_ONCE], [ : - AC_FOREACH([gl_DECL_NAME], [$1], [ - AC_DEFUN([gl_CHECK_DECL_]defn([gl_DECL_NAME]), [ - AC_CHECK_DECLS(defn([gl_DECL_NAME])) + m4_foreach_w([gl_DECL_NAME], [$1], [ + AC_DEFUN([gl_CHECK_DECL_]m4_defn([gl_DECL_NAME]), [ + AC_CHECK_DECLS(m4_defn([gl_DECL_NAME])) ]) - AC_REQUIRE([gl_CHECK_DECL_]defn([gl_DECL_NAME])) + AC_REQUIRE([gl_CHECK_DECL_]m4_defn([gl_DECL_NAME])) ]) ])