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annotate m4/onceonly_2_57.m4 @ 6479:913b40e88d1a

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author Sergey Poznyakoff <gray@gnu.org.ua>
date Fri, 09 Dec 2005 12:34:04 +0000
parents 954deae9185d
children b392232a8925
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1 # onceonly_2_57.m4 serial 3
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2 dnl Copyright (C) 2002-2003, 2005 Free Software Foundation, Inc.
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3 dnl This file is free software, distributed under the terms of the GNU
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4 dnl General Public License. As a special exception to the GNU General
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5 dnl Public License, this file may be distributed as part of a program
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6 dnl that contains a configuration script generated by Autoconf, under
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7 dnl the same distribution terms as the rest of that program.
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8
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9 dnl This file defines some "once only" variants of standard autoconf macros.
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10 dnl AC_CHECK_HEADERS_ONCE like AC_CHECK_HEADERS
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11 dnl AC_CHECK_FUNCS_ONCE like AC_CHECK_FUNCS
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12 dnl AC_CHECK_DECLS_ONCE like AC_CHECK_DECLS
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13 dnl AC_REQUIRE([AC_HEADER_STDC]) like AC_HEADER_STDC
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14 dnl The advantage is that the check for each of the headers/functions/decls
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15 dnl will be put only once into the 'configure' file. It keeps the size of
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16 dnl the 'configure' file down, and avoids redundant output when 'configure'
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17 dnl is run.
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18 dnl The drawback is that the checks cannot be conditionalized. If you write
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19 dnl if some_condition; then gl_CHECK_HEADERS(stdlib.h); fi
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20 dnl inside an AC_DEFUNed function, the gl_CHECK_HEADERS macro call expands to
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21 dnl empty, and the check will be inserted before the body of the AC_DEFUNed
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22 dnl function.
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23
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24 dnl This is like onceonly.m4, except that it uses diversions to named sections
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25 dnl DEFAULTS and INIT_PREPARE in order to check all requested headers at once,
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26 dnl thus reducing the size of 'configure'. Works with autoconf-2.57. The
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27 dnl size reduction is ca. 9%.
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28
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29 dnl Autoconf version 2.57 or newer is recommended.
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30 AC_PREREQ(2.57)
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31
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32 # AC_CHECK_HEADERS_ONCE(HEADER1 HEADER2 ...) is a once-only variant of
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33 # AC_CHECK_HEADERS(HEADER1 HEADER2 ...).
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34 AC_DEFUN([AC_CHECK_HEADERS_ONCE], [
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35 :
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36 AC_FOREACH([gl_HEADER_NAME], [$1], [
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37 AC_DEFUN([gl_CHECK_HEADER_]m4_quote(translit(gl_HEADER_NAME,
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38 [./-], [___])), [
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39 m4_divert_text([INIT_PREPARE],
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40 [gl_header_list="$gl_header_list gl_HEADER_NAME"])
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41 gl_HEADERS_EXPANSION
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42 AH_TEMPLATE(AS_TR_CPP([HAVE_]m4_defn([gl_HEADER_NAME])),
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43 [Define to 1 if you have the <]m4_defn([gl_HEADER_NAME])[> header file.])
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44 ])
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45 AC_REQUIRE([gl_CHECK_HEADER_]m4_quote(translit(gl_HEADER_NAME,
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46 [./-], [___])))
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47 ])
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48 ])
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49 m4_define([gl_HEADERS_EXPANSION], [
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50 m4_divert_text([DEFAULTS], [gl_header_list=])
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51 AC_CHECK_HEADERS([$gl_header_list])
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52 m4_define([gl_HEADERS_EXPANSION], [])
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53 ])
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54
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55 # AC_CHECK_FUNCS_ONCE(FUNC1 FUNC2 ...) is a once-only variant of
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56 # AC_CHECK_FUNCS(FUNC1 FUNC2 ...).
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57 AC_DEFUN([AC_CHECK_FUNCS_ONCE], [
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58 :
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59 AC_FOREACH([gl_FUNC_NAME], [$1], [
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60 AC_DEFUN([gl_CHECK_FUNC_]m4_defn([gl_FUNC_NAME]), [
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61 m4_divert_text([INIT_PREPARE],
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62 [gl_func_list="$gl_func_list gl_FUNC_NAME"])
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63 gl_FUNCS_EXPANSION
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64 AH_TEMPLATE(AS_TR_CPP([HAVE_]m4_defn([gl_FUNC_NAME])),
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65 [Define to 1 if you have the `]m4_defn([gl_FUNC_NAME])[' function.])
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66 ])
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67 AC_REQUIRE([gl_CHECK_FUNC_]m4_defn([gl_FUNC_NAME]))
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68 ])
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69 ])
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70 m4_define([gl_FUNCS_EXPANSION], [
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71 m4_divert_text([DEFAULTS], [gl_func_list=])
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72 AC_CHECK_FUNCS([$gl_func_list])
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73 m4_define([gl_FUNCS_EXPANSION], [])
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74 ])
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75
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76 # AC_CHECK_DECLS_ONCE(DECL1 DECL2 ...) is a once-only variant of
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77 # AC_CHECK_DECLS(DECL1, DECL2, ...).
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78 AC_DEFUN([AC_CHECK_DECLS_ONCE], [
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79 :
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80 AC_FOREACH([gl_DECL_NAME], [$1], [
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81 AC_DEFUN([gl_CHECK_DECL_]m4_defn([gl_DECL_NAME]), [
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82 AC_CHECK_DECLS(m4_defn([gl_DECL_NAME]))
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83 ])
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84 AC_REQUIRE([gl_CHECK_DECL_]m4_defn([gl_DECL_NAME]))
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85 ])
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86 ])