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Autoconf Macro: ac_define_sub_path
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<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 ${exec_prefix}.
Just cut out the prefix and ac_define the value. The value is uppercased
and PATH_ prepended ie. ac_define_sub_paths(bindir libdir pkgdatadir) will
create the defines PATH_BINDIR PATH_LIBDIR PATH_PKGDATADIR - see posix'
include/paths.h that creates _PATH_DEV and friends.
</p>
</div>
<h2>
Author
</h2>
<p class="indent">
Guido U. Draheim <guidod@gmx.de>
</p>
<h2>
Last Modified
</h2>
<p class="indent">
2006-10-13
</p>
<h2>
M4 Source Code
</h2>
<div class="indent">
<pre class="m4source">
AC_DEFUN([AC_DEFINE_SUB_PATH],
[dnl
test "_$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>
<h2>
License
</h2>
<div class="indent">
<span style="white-space:nowrap;">Copyright © 2006 Guido U. Draheim
<guidod@gmx.de></span>
<p>
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your option)
any later version.
</p>
<p>
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
</p>
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You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc., 59
Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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