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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>
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<h2>
SOURCE CODE
</h2>
<p class="indent">
<a href=
"http://autoconf-archive.cryp.to/ac_define_sub_path.m4">http://autoconf-archive.cryp.to/ac_define_sub_path.m4</a>
</p>
<h2>
LICENSE
</h2>
<div class="indent">
<p style="white-space:nowrap;">
Copyright © 2008 Guido U. Draheim <guidod@gmx.de>
</p>
<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>
<p>
You should have received a copy of the GNU General Public License along
with this program. If not, see <<a href=
"http://www.gnu.org/licenses/">http://www.gnu.org/licenses/</a>>.
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