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author | Thomas Guyot-Sionnest <dermoth@aei.ca> | 2009-01-15 04:22:57 -0500 |
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committer | Thomas Guyot-Sionnest <dermoth@aei.ca> | 2009-01-15 05:19:08 -0500 |
commit | 71cdb52799220f8d9052643baf1d3e9836a9c755 (patch) | |
tree | 27aee97a35d9ab51f0d8f64a46690bd41a5f8c1b /gl/m4/onceonly.m4 | |
parent | f7afa46586645e50498d8b2d0c67884f014dc3a4 (diff) | |
download | monitoring-plugins-71cdb52799220f8d9052643baf1d3e9836a9c755.tar.gz |
Sync with gnulib
Diffstat (limited to 'gl/m4/onceonly.m4')
-rw-r--r-- | gl/m4/onceonly.m4 | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/gl/m4/onceonly.m4 b/gl/m4/onceonly.m4 new file mode 100644 index 00000000..108cd6c1 --- /dev/null +++ b/gl/m4/onceonly.m4 | |||
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1 | # onceonly.m4 serial 6 | ||
2 | dnl Copyright (C) 2002-2003, 2005-2006, 2008 Free Software Foundation, Inc. | ||
3 | dnl This file is free software, distributed under the terms of the GNU | ||
4 | dnl General Public License. As a special exception to the GNU General | ||
5 | dnl Public License, this file may be distributed as part of a program | ||
6 | dnl that contains a configuration script generated by Autoconf, under | ||
7 | dnl the same distribution terms as the rest of that program. | ||
8 | |||
9 | dnl This file defines some "once only" variants of standard autoconf macros. | ||
10 | dnl AC_CHECK_HEADERS_ONCE like AC_CHECK_HEADERS | ||
11 | dnl AC_CHECK_FUNCS_ONCE like AC_CHECK_FUNCS | ||
12 | dnl AC_CHECK_DECLS_ONCE like AC_CHECK_DECLS | ||
13 | dnl AC_REQUIRE([AC_FUNC_STRCOLL]) like AC_FUNC_STRCOLL | ||
14 | dnl The advantage is that the check for each of the headers/functions/decls | ||
15 | dnl will be put only once into the 'configure' file. It keeps the size of | ||
16 | dnl the 'configure' file down, and avoids redundant output when 'configure' | ||
17 | dnl is run. | ||
18 | dnl The drawback is that the checks cannot be conditionalized. If you write | ||
19 | dnl if some_condition; then gl_CHECK_HEADERS(stdlib.h); fi | ||
20 | dnl inside an AC_DEFUNed function, the gl_CHECK_HEADERS macro call expands to | ||
21 | dnl empty, and the check will be inserted before the body of the AC_DEFUNed | ||
22 | dnl function. | ||
23 | |||
24 | dnl The original code implemented AC_CHECK_HEADERS_ONCE and AC_CHECK_FUNCS_ONCE | ||
25 | dnl in terms of AC_DEFUN and AC_REQUIRE. This implementation uses diversions to | ||
26 | dnl named sections DEFAULTS and INIT_PREPARE in order to check all requested | ||
27 | dnl headers at once, thus reducing the size of 'configure'. It is known to work | ||
28 | dnl with autoconf 2.57..2.62 at least . The size reduction is ca. 9%. | ||
29 | |||
30 | dnl Autoconf version 2.59 plus gnulib is required; this file is not needed | ||
31 | dnl with Autoconf 2.60 or greater. But note that autoconf's implementation of | ||
32 | dnl AC_CHECK_DECLS_ONCE expects a comma-separated list of symbols as first | ||
33 | dnl argument! | ||
34 | AC_PREREQ([2.59]) | ||
35 | |||
36 | # AC_CHECK_HEADERS_ONCE(HEADER1 HEADER2 ...) is a once-only variant of | ||
37 | # AC_CHECK_HEADERS(HEADER1 HEADER2 ...). | ||
38 | AC_DEFUN([AC_CHECK_HEADERS_ONCE], [ | ||
39 | : | ||
40 | m4_foreach_w([gl_HEADER_NAME], [$1], [ | ||
41 | AC_DEFUN([gl_CHECK_HEADER_]m4_quote(translit(gl_HEADER_NAME, | ||
42 | [./-], [___])), [ | ||
43 | m4_divert_text([INIT_PREPARE], | ||
44 | [gl_header_list="$gl_header_list gl_HEADER_NAME"]) | ||
45 | gl_HEADERS_EXPANSION | ||
46 | AH_TEMPLATE(AS_TR_CPP([HAVE_]m4_defn([gl_HEADER_NAME])), | ||
47 | [Define to 1 if you have the <]m4_defn([gl_HEADER_NAME])[> header file.]) | ||
48 | ]) | ||
49 | AC_REQUIRE([gl_CHECK_HEADER_]m4_quote(translit(gl_HEADER_NAME, | ||
50 | [./-], [___]))) | ||
51 | ]) | ||
52 | ]) | ||
53 | m4_define([gl_HEADERS_EXPANSION], [ | ||
54 | m4_divert_text([DEFAULTS], [gl_header_list=]) | ||
55 | AC_CHECK_HEADERS([$gl_header_list]) | ||
56 | m4_define([gl_HEADERS_EXPANSION], []) | ||
57 | ]) | ||
58 | |||
59 | # AC_CHECK_FUNCS_ONCE(FUNC1 FUNC2 ...) is a once-only variant of | ||
60 | # AC_CHECK_FUNCS(FUNC1 FUNC2 ...). | ||
61 | AC_DEFUN([AC_CHECK_FUNCS_ONCE], [ | ||
62 | : | ||
63 | m4_foreach_w([gl_FUNC_NAME], [$1], [ | ||
64 | AC_DEFUN([gl_CHECK_FUNC_]m4_defn([gl_FUNC_NAME]), [ | ||
65 | m4_divert_text([INIT_PREPARE], | ||
66 | [gl_func_list="$gl_func_list gl_FUNC_NAME"]) | ||
67 | gl_FUNCS_EXPANSION | ||
68 | AH_TEMPLATE(AS_TR_CPP([HAVE_]m4_defn([gl_FUNC_NAME])), | ||
69 | [Define to 1 if you have the `]m4_defn([gl_FUNC_NAME])[' function.]) | ||
70 | ]) | ||
71 | AC_REQUIRE([gl_CHECK_FUNC_]m4_defn([gl_FUNC_NAME])) | ||
72 | ]) | ||
73 | ]) | ||
74 | m4_define([gl_FUNCS_EXPANSION], [ | ||
75 | m4_divert_text([DEFAULTS], [gl_func_list=]) | ||
76 | AC_CHECK_FUNCS([$gl_func_list]) | ||
77 | m4_define([gl_FUNCS_EXPANSION], []) | ||
78 | ]) | ||
79 | |||
80 | # AC_CHECK_DECLS_ONCE(DECL1 DECL2 ...) is a once-only variant of | ||
81 | # AC_CHECK_DECLS(DECL1, DECL2, ...). | ||
82 | AC_DEFUN([AC_CHECK_DECLS_ONCE], [ | ||
83 | : | ||
84 | m4_foreach_w([gl_DECL_NAME], [$1], [ | ||
85 | AC_DEFUN([gl_CHECK_DECL_]m4_defn([gl_DECL_NAME]), [ | ||
86 | AC_CHECK_DECLS(m4_defn([gl_DECL_NAME])) | ||
87 | ]) | ||
88 | AC_REQUIRE([gl_CHECK_DECL_]m4_defn([gl_DECL_NAME])) | ||
89 | ]) | ||
90 | ]) | ||