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comparison m4/onceonly.m4 @ 421:3c2e1f24cc7d 3.0-beta2
Added generated files for release
author | lost@l-w.ca |
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date | Sun, 19 Sep 2010 01:33:24 -0600 |
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420:7366deedfa85 | 421:3c2e1f24cc7d |
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1 # onceonly.m4 serial 6 | |
2 dnl Copyright (C) 2002-2003, 2005-2006, 2008-2010 Free Software Foundation, | |
3 dnl Inc. | |
4 dnl This file is free software, distributed under the terms of the GNU | |
5 dnl General Public License. As a special exception to the GNU General | |
6 dnl Public License, this file may be distributed as part of a program | |
7 dnl that contains a configuration script generated by Autoconf, under | |
8 dnl the same distribution terms as the rest of that program. | |
9 | |
10 dnl This file defines some "once only" variants of standard autoconf macros. | |
11 dnl AC_CHECK_HEADERS_ONCE like AC_CHECK_HEADERS | |
12 dnl AC_CHECK_FUNCS_ONCE like AC_CHECK_FUNCS | |
13 dnl AC_CHECK_DECLS_ONCE like AC_CHECK_DECLS | |
14 dnl AC_REQUIRE([AC_FUNC_STRCOLL]) like AC_FUNC_STRCOLL | |
15 dnl The advantage is that the check for each of the headers/functions/decls | |
16 dnl will be put only once into the 'configure' file. It keeps the size of | |
17 dnl the 'configure' file down, and avoids redundant output when 'configure' | |
18 dnl is run. | |
19 dnl The drawback is that the checks cannot be conditionalized. If you write | |
20 dnl if some_condition; then gl_CHECK_HEADERS(stdlib.h); fi | |
21 dnl inside an AC_DEFUNed function, the gl_CHECK_HEADERS macro call expands to | |
22 dnl empty, and the check will be inserted before the body of the AC_DEFUNed | |
23 dnl function. | |
24 | |
25 dnl The original code implemented AC_CHECK_HEADERS_ONCE and AC_CHECK_FUNCS_ONCE | |
26 dnl in terms of AC_DEFUN and AC_REQUIRE. This implementation uses diversions to | |
27 dnl named sections DEFAULTS and INIT_PREPARE in order to check all requested | |
28 dnl headers at once, thus reducing the size of 'configure'. It is known to work | |
29 dnl with autoconf 2.57..2.62 at least . The size reduction is ca. 9%. | |
30 | |
31 dnl Autoconf version 2.59 plus gnulib is required; this file is not needed | |
32 dnl with Autoconf 2.60 or greater. But note that autoconf's implementation of | |
33 dnl AC_CHECK_DECLS_ONCE expects a comma-separated list of symbols as first | |
34 dnl argument! | |
35 AC_PREREQ([2.59]) | |
36 | |
37 # AC_CHECK_HEADERS_ONCE(HEADER1 HEADER2 ...) is a once-only variant of | |
38 # AC_CHECK_HEADERS(HEADER1 HEADER2 ...). | |
39 AC_DEFUN([AC_CHECK_HEADERS_ONCE], [ | |
40 : | |
41 m4_foreach_w([gl_HEADER_NAME], [$1], [ | |
42 AC_DEFUN([gl_CHECK_HEADER_]m4_quote(translit(gl_HEADER_NAME, | |
43 [./-], [___])), [ | |
44 m4_divert_text([INIT_PREPARE], | |
45 [gl_header_list="$gl_header_list gl_HEADER_NAME"]) | |
46 gl_HEADERS_EXPANSION | |
47 AH_TEMPLATE(AS_TR_CPP([HAVE_]m4_defn([gl_HEADER_NAME])), | |
48 [Define to 1 if you have the <]m4_defn([gl_HEADER_NAME])[> header file.]) | |
49 ]) | |
50 AC_REQUIRE([gl_CHECK_HEADER_]m4_quote(translit(gl_HEADER_NAME, | |
51 [./-], [___]))) | |
52 ]) | |
53 ]) | |
54 m4_define([gl_HEADERS_EXPANSION], [ | |
55 m4_divert_text([DEFAULTS], [gl_header_list=]) | |
56 AC_CHECK_HEADERS([$gl_header_list]) | |
57 m4_define([gl_HEADERS_EXPANSION], []) | |
58 ]) | |
59 | |
60 # AC_CHECK_FUNCS_ONCE(FUNC1 FUNC2 ...) is a once-only variant of | |
61 # AC_CHECK_FUNCS(FUNC1 FUNC2 ...). | |
62 AC_DEFUN([AC_CHECK_FUNCS_ONCE], [ | |
63 : | |
64 m4_foreach_w([gl_FUNC_NAME], [$1], [ | |
65 AC_DEFUN([gl_CHECK_FUNC_]m4_defn([gl_FUNC_NAME]), [ | |
66 m4_divert_text([INIT_PREPARE], | |
67 [gl_func_list="$gl_func_list gl_FUNC_NAME"]) | |
68 gl_FUNCS_EXPANSION | |
69 AH_TEMPLATE(AS_TR_CPP([HAVE_]m4_defn([gl_FUNC_NAME])), | |
70 [Define to 1 if you have the `]m4_defn([gl_FUNC_NAME])[' function.]) | |
71 ]) | |
72 AC_REQUIRE([gl_CHECK_FUNC_]m4_defn([gl_FUNC_NAME])) | |
73 ]) | |
74 ]) | |
75 m4_define([gl_FUNCS_EXPANSION], [ | |
76 m4_divert_text([DEFAULTS], [gl_func_list=]) | |
77 AC_CHECK_FUNCS([$gl_func_list]) | |
78 m4_define([gl_FUNCS_EXPANSION], []) | |
79 ]) | |
80 | |
81 # AC_CHECK_DECLS_ONCE(DECL1 DECL2 ...) is a once-only variant of | |
82 # AC_CHECK_DECLS(DECL1, DECL2, ...). | |
83 AC_DEFUN([AC_CHECK_DECLS_ONCE], [ | |
84 : | |
85 m4_foreach_w([gl_DECL_NAME], [$1], [ | |
86 AC_DEFUN([gl_CHECK_DECL_]m4_defn([gl_DECL_NAME]), [ | |
87 AC_CHECK_DECLS(m4_defn([gl_DECL_NAME])) | |
88 ]) | |
89 AC_REQUIRE([gl_CHECK_DECL_]m4_defn([gl_DECL_NAME])) | |
90 ]) | |
91 ]) |