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Diffstat (limited to 'm4/onceonly_2_57.m4')
-rw-r--r-- | m4/onceonly_2_57.m4 | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/m4/onceonly_2_57.m4 b/m4/onceonly_2_57.m4 new file mode 100644 index 00000000..14d3c0b2 --- /dev/null +++ b/m4/onceonly_2_57.m4 | |||
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1 | # onceonly_2_57.m4 serial 3 | ||
2 | dnl Copyright (C) 2002-2003, 2005 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_HEADER_STDC]) like AC_HEADER_STDC | ||
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 This is like onceonly.m4, except that it uses diversions to named sections | ||
25 | dnl DEFAULTS and INIT_PREPARE in order to check all requested headers at once, | ||
26 | dnl thus reducing the size of 'configure'. Works with autoconf-2.57. The | ||
27 | dnl size reduction is ca. 9%. | ||
28 | |||
29 | dnl Autoconf version 2.57 or newer is recommended. | ||
30 | AC_PREREQ(2.57) | ||
31 | |||
32 | # AC_CHECK_HEADERS_ONCE(HEADER1 HEADER2 ...) is a once-only variant of | ||
33 | # AC_CHECK_HEADERS(HEADER1 HEADER2 ...). | ||
34 | AC_DEFUN([AC_CHECK_HEADERS_ONCE], [ | ||
35 | : | ||
36 | AC_FOREACH([gl_HEADER_NAME], [$1], [ | ||
37 | AC_DEFUN([gl_CHECK_HEADER_]m4_quote(translit(gl_HEADER_NAME, | ||
38 | [./-], [___])), [ | ||
39 | m4_divert_text([INIT_PREPARE], | ||
40 | [gl_header_list="$gl_header_list gl_HEADER_NAME"]) | ||
41 | gl_HEADERS_EXPANSION | ||
42 | AH_TEMPLATE(AS_TR_CPP([HAVE_]m4_defn([gl_HEADER_NAME])), | ||
43 | [Define to 1 if you have the <]m4_defn([gl_HEADER_NAME])[> header file.]) | ||
44 | ]) | ||
45 | AC_REQUIRE([gl_CHECK_HEADER_]m4_quote(translit(gl_HEADER_NAME, | ||
46 | [./-], [___]))) | ||
47 | ]) | ||
48 | ]) | ||
49 | m4_define([gl_HEADERS_EXPANSION], [ | ||
50 | m4_divert_text([DEFAULTS], [gl_header_list=]) | ||
51 | AC_CHECK_HEADERS([$gl_header_list]) | ||
52 | m4_define([gl_HEADERS_EXPANSION], []) | ||
53 | ]) | ||
54 | |||
55 | # AC_CHECK_FUNCS_ONCE(FUNC1 FUNC2 ...) is a once-only variant of | ||
56 | # AC_CHECK_FUNCS(FUNC1 FUNC2 ...). | ||
57 | AC_DEFUN([AC_CHECK_FUNCS_ONCE], [ | ||
58 | : | ||
59 | AC_FOREACH([gl_FUNC_NAME], [$1], [ | ||
60 | AC_DEFUN([gl_CHECK_FUNC_]m4_defn([gl_FUNC_NAME]), [ | ||
61 | m4_divert_text([INIT_PREPARE], | ||
62 | [gl_func_list="$gl_func_list gl_FUNC_NAME"]) | ||
63 | gl_FUNCS_EXPANSION | ||
64 | AH_TEMPLATE(AS_TR_CPP([HAVE_]m4_defn([gl_FUNC_NAME])), | ||
65 | [Define to 1 if you have the `]m4_defn([gl_FUNC_NAME])[' function.]) | ||
66 | ]) | ||
67 | AC_REQUIRE([gl_CHECK_FUNC_]m4_defn([gl_FUNC_NAME])) | ||
68 | ]) | ||
69 | ]) | ||
70 | m4_define([gl_FUNCS_EXPANSION], [ | ||
71 | m4_divert_text([DEFAULTS], [gl_func_list=]) | ||
72 | AC_CHECK_FUNCS([$gl_func_list]) | ||
73 | m4_define([gl_FUNCS_EXPANSION], []) | ||
74 | ]) | ||
75 | |||
76 | # AC_CHECK_DECLS_ONCE(DECL1 DECL2 ...) is a once-only variant of | ||
77 | # AC_CHECK_DECLS(DECL1, DECL2, ...). | ||
78 | AC_DEFUN([AC_CHECK_DECLS_ONCE], [ | ||
79 | : | ||
80 | AC_FOREACH([gl_DECL_NAME], [$1], [ | ||
81 | AC_DEFUN([gl_CHECK_DECL_]m4_defn([gl_DECL_NAME]), [ | ||
82 | AC_CHECK_DECLS(m4_defn([gl_DECL_NAME])) | ||
83 | ]) | ||
84 | AC_REQUIRE([gl_CHECK_DECL_]m4_defn([gl_DECL_NAME])) | ||
85 | ]) | ||
86 | ]) | ||