1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html lang="en">
<head>
<title>
Autoconf Macro: ac_define_sub_path
</title>
<link rel="stylesheet" type="text/css" href="ac-archive.css">
</head>
<body>
<table summary="web navigation" style="width:100%;">
<tbody>
<tr>
<td style="width:50%;" align="center">
<a href="http://autoconf-archive.cryp.to/ac_define_sub_path.m4">Download
M4 Source</a>
</td>
<td style="width:50%;" align="center">
<a href="macros-by-category.html">Macro Index Page</a>
</td>
</tr>
</tbody>
</table>
<hr>
<h1>
ac_define_sub_path
</h1>
<h2>
Synopsis
</h2>
<p class="indent" style="white-space:nowrap;">
<code>AC_DEFINE_SUB_PATH(DEFNAME, varname, description)</code>
</p>
<h2>
Description
</h2>
<div class="indent">
<p>
Look at varname and detect the subpath that it contains relative to
$prefix/$exec_prefix. If the path is indeed relative to
$prefix/$exec_prefix, then a single "./" (dotslash) is prepended, otherwise
it can be seen as an absolute path that can not be moved, which you
possibly do for "/etc" files, or even those ending up in "/lib/modules" or
"/winnt/system".
</p>
<p>
This macro is not very intelligent, it's just a first try in this
direction. It does currently just look into the current patterns, and
replaces a ${prefix} with a simple dot. Amazingly, it works quite well for
most packages.
</p>
<p>
Example (configure.ac):
</p>
<pre>
AC_DEFINE_DIR([EPREFIX], [exec_prefix], [--exec-prefix or default])
AC_DEFINE_SUB_PATH([PATH_LIBDIR], [libdir], [--bindir subdir])
AC_DEFINE_UNQUOTED([PACKAGE],"$PACKAGE", [Name of package])
</pre>
<p>
Example (in C):
</p>
<pre>
static const char _libdir[] = PATH_LIBDIR; /* configure default */
char* libdir;
char* eprefix = getenv (PACKAGE "DIR");
if (! eprefix) eprefix = EPREFIX; /* default */
if (*_libdir != '.') libdir = strdup(_libdir);
else {
libdir = malloc(strlen(eprefix) + strlen(_libdir) + 2);
strcpy(libdir, eprefix);
strcat(libdir, PATH_DELIMITER_STRING);
strcat(libdir, _libdir);
}
...
free (libdir);
</pre>
<p>
The AC_DEFINE_SUB_PATHS(varnames) macro looks for the given various
install-paths that largely depend on either ${prefix} or ${exec_prefix}.
Just cut out the prefix and ac_define the value. The value is uppercased
and PATH_ prepended ie. ac_define_sub_paths(bindir libdir pkgdatadir) will
create the defines PATH_BINDIR PATH_LIBDIR PATH_PKGDATADIR - see posix'
include/paths.h that creates _PATH_DEV and friends.
</p>
</div>
<h2>
Author
</h2>
<p class="indent">
Guido Draheim <guidod@gmx.de>
</p>
<h2>
Last Modified
</h2>
<p class="indent">
2001-07-26
</p>
<h2>
M4 Source Code
</h2>
<div class="indent">
<pre class="m4source">
AC_DEFUN([AC_DEFINE_SUB_PATH],
[dnl
test "_$prefix" = _NONE && prefix="$ac_default_prefix"
test "_$exec_prefix" = _NONE && exec_prefix='${prefix}'
P=`echo ifelse( $2, , [$]$1, [$]$2) | sed -e 's:^\${[a-z_]*prefix}:.:'`
ifelse ($3, ,
AC_DEFINE($1, $P, [sub path $2]),
AC_DEFINE($1, $P, $3))
])
AC_DEFUN([AC_DEFINE_SUB_PATHS],
[dnl
test "_$prefix" = _NONE && prefix="$ac_default_prefix"
test "_$exec_prefix" = _NONE && exec_prefix='${prefix}'
for i in $1 ; do
P=`echo \$$i | sed -e 's:^\${[a-z_]*prefix}:.:'`
V=`echo path_$i | sed -e 'y:abcdefghijklmnopqrstuvwxyz:ABCDEFGHIJKLMNOPQRSTUVWXYZ:'`
AC_DEFINE($V, $P, [sub path $i]),
])
</pre>
</div>
</body>
</html>
|
