| 1 | # onceonly.m4 serial 9
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| 2 | dnl Copyright (C) 2002-2003, 2005-2006, 2008-2012 Free Software Foundation,
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| 3 | dnl Inc.
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| 4 | dnl
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| 5 | dnl This file is free software; you can redistribute it and/or modify
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| 6 | dnl it under the terms of the GNU General Public License as published by
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| 7 | dnl the Free Software Foundation; either version 3 of the License, or
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| 8 | dnl (at your option) any later version.
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| 9 | dnl
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| 10 | dnl This file is distributed in the hope that it will be useful,
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| 11 | dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | dnl GNU General Public License for more details.
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| 14 | dnl
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| 15 | dnl You should have received a copy of the GNU General Public License
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| 16 | dnl along with this file. If not, see <http://www.gnu.org/licenses/>.
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| 17 | dnl
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| 18 | dnl As a special exception to the GNU General Public License,
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| 19 | dnl this file may be distributed as part of a program
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| 20 | dnl that contains a configuration script generated by Autoconf, under
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| 21 | dnl the same distribution terms as the rest of that program.
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| 22 |
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| 23 | dnl This file defines some "once only" variants of standard autoconf macros.
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| 24 | dnl AC_CHECK_HEADERS_ONCE like AC_CHECK_HEADERS
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| 25 | dnl AC_CHECK_FUNCS_ONCE like AC_CHECK_FUNCS
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| 26 | dnl AC_CHECK_DECLS_ONCE like AC_CHECK_DECLS
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| 27 | dnl AC_REQUIRE([AC_FUNC_STRCOLL]) like AC_FUNC_STRCOLL
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| 28 | dnl The advantage is that the check for each of the headers/functions/decls
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| 29 | dnl will be put only once into the 'configure' file. It keeps the size of
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| 30 | dnl the 'configure' file down, and avoids redundant output when 'configure'
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| 31 | dnl is run.
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| 32 | dnl The drawback is that the checks cannot be conditionalized. If you write
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| 33 | dnl if some_condition; then gl_CHECK_HEADERS(stdlib.h); fi
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| 34 | dnl inside an AC_DEFUNed function, the gl_CHECK_HEADERS macro call expands to
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| 35 | dnl empty, and the check will be inserted before the body of the AC_DEFUNed
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| 36 | dnl function.
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| 37 |
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| 38 | dnl The original code implemented AC_CHECK_HEADERS_ONCE and AC_CHECK_FUNCS_ONCE
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| 39 | dnl in terms of AC_DEFUN and AC_REQUIRE. This implementation uses diversions to
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| 40 | dnl named sections DEFAULTS and INIT_PREPARE in order to check all requested
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| 41 | dnl headers at once, thus reducing the size of 'configure'. It is known to work
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| 42 | dnl with autoconf 2.57..2.62 at least . The size reduction is ca. 9%.
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| 43 |
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| 44 | dnl Autoconf version 2.59 plus gnulib is required; this file is not needed
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| 45 | dnl with Autoconf 2.60 or greater. But note that autoconf's implementation of
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| 46 | dnl AC_CHECK_DECLS_ONCE expects a comma-separated list of symbols as first
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| 47 | dnl argument!
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| 48 | AC_PREREQ([2.59])
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| 49 |
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| 50 | # AC_CHECK_HEADERS_ONCE(HEADER1 HEADER2 ...) is a once-only variant of
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| 51 | # AC_CHECK_HEADERS(HEADER1 HEADER2 ...).
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| 52 | AC_DEFUN([AC_CHECK_HEADERS_ONCE], [
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| 53 | :
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| 54 | m4_foreach_w([gl_HEADER_NAME], [$1], [
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| 55 | AC_DEFUN([gl_CHECK_HEADER_]m4_quote(m4_translit(gl_HEADER_NAME,
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| 56 | [./-], [___])), [
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| 57 | m4_divert_text([INIT_PREPARE],
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| 58 | [gl_header_list="$gl_header_list gl_HEADER_NAME"])
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| 59 | gl_HEADERS_EXPANSION
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| 60 | AH_TEMPLATE(AS_TR_CPP([HAVE_]m4_defn([gl_HEADER_NAME])),
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| 61 | [Define to 1 if you have the <]m4_defn([gl_HEADER_NAME])[> header file.])
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| 62 | ])
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| 63 | AC_REQUIRE([gl_CHECK_HEADER_]m4_quote(m4_translit(gl_HEADER_NAME,
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| 64 | [./-], [___])))
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| 65 | ])
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| 66 | ])
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| 67 | m4_define([gl_HEADERS_EXPANSION], [
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| 68 | m4_divert_text([DEFAULTS], [gl_header_list=])
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| 69 | AC_CHECK_HEADERS([$gl_header_list])
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| 70 | m4_define([gl_HEADERS_EXPANSION], [])
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| 71 | ])
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| 72 |
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| 73 | # AC_CHECK_FUNCS_ONCE(FUNC1 FUNC2 ...) is a once-only variant of
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| 74 | # AC_CHECK_FUNCS(FUNC1 FUNC2 ...).
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| 75 | AC_DEFUN([AC_CHECK_FUNCS_ONCE], [
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| 76 | :
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| 77 | m4_foreach_w([gl_FUNC_NAME], [$1], [
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| 78 | AC_DEFUN([gl_CHECK_FUNC_]m4_defn([gl_FUNC_NAME]), [
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| 79 | m4_divert_text([INIT_PREPARE],
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| 80 | [gl_func_list="$gl_func_list gl_FUNC_NAME"])
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| 81 | gl_FUNCS_EXPANSION
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| 82 | AH_TEMPLATE(AS_TR_CPP([HAVE_]m4_defn([gl_FUNC_NAME])),
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| 83 | [Define to 1 if you have the ']m4_defn([gl_FUNC_NAME])[' function.])
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| 84 | ])
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| 85 | AC_REQUIRE([gl_CHECK_FUNC_]m4_defn([gl_FUNC_NAME]))
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| 86 | ])
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| 87 | ])
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| 88 | m4_define([gl_FUNCS_EXPANSION], [
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| 89 | m4_divert_text([DEFAULTS], [gl_func_list=])
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| 90 | AC_CHECK_FUNCS([$gl_func_list])
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| 91 | m4_define([gl_FUNCS_EXPANSION], [])
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| 92 | ])
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| 93 |
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| 94 | # AC_CHECK_DECLS_ONCE(DECL1 DECL2 ...) is a once-only variant of
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| 95 | # AC_CHECK_DECLS(DECL1, DECL2, ...).
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| 96 | AC_DEFUN([AC_CHECK_DECLS_ONCE], [
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| 97 | :
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| 98 | m4_foreach_w([gl_DECL_NAME], [$1], [
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| 99 | AC_DEFUN([gl_CHECK_DECL_]m4_defn([gl_DECL_NAME]), [
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| 100 | AC_CHECK_DECLS(m4_defn([gl_DECL_NAME]))
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| 101 | ])
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| 102 | AC_REQUIRE([gl_CHECK_DECL_]m4_defn([gl_DECL_NAME]))
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| 103 | ])
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| 104 | ])
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