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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
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<head>
<title>
Autoconf Macro: ac_subst_prefix_subpaths
</title>
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"http://autoconf-archive.cryp.to/ac_subst_prefix_subpaths.m4">Download M4
Source</a>
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<hr>
<h1>
ac_subst_prefix_subpaths
</h1>
<h2>
Obsolete Macro
</h2>
<p class="indent">
Renamed to AC_DEFINE_SUB_PATH.
</p>
<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
</p>
<p>
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 ${prefix} with a simple dot. Amazingly, it works quite well for
most packages.
</p>
<p>
correct usage: in configure ac
</p>
<pre>
AC_DEFINE_DIR([EPREFIX], [exec_prefix], [--exec-prefix or default])
AC_DEFINE_SUB_PATH([PATH_LIBDIR], [libdir], [--bindir subdir])
AC_DEFINE_UNQUOTED([PACKAGE],"$PACKAGE", [Name of package])
</pre>
<p>
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>
AC_DEFINE_SUB_PATHS(varnames)
</p>
<p>
look for the given various install-paths that largely depend on either
${prefix} or ${exec_prefix}. Just cut out the prefix and ac_define the
value. The value is uppercased and PATH_ prepended ie.
ac_define_sub_paths(bindir libdir pkgdatadir) will create the defines
PATH_BINDIR PATH_LIBDIR PATH_PKGDATADIR - see posix' include/paths.h that
creates _PATH_DEV and friends.
</p>
</div>
<h2>
Author
</h2>
<p class="indent">
Guido Draheim <guidod@gmx.de>
</p>
<h2>
Last Modified
</h2>
<p class="indent">
2005-08-01
</p>
<h2>
M4 Source Code
</h2>
<div class="indent">
<pre class="m4source">
AC_DEFUN([AC_DEFINE_SUB_PATH],
[dnl
test "_$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>
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