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# ===========================================================================
# http://www.nongnu.org/autoconf-archive/ax_define_sub_path.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_DEFINE_SUB_PATH(DEFNAME, varname, description)
#
# DESCRIPTION
#
# 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".
#
# 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 ${prefix} with a simple dot. Amazingly, it works quite well
# for most packages.
#
# Example (configure.ac):
#
# AX_DEFINE_DIR([EPREFIX], [exec_prefix], [--exec-prefix or default])
# AX_DEFINE_SUB_PATH([PATH_LIBDIR], [libdir], [--bindir subdir])
# AC_DEFINE_UNQUOTED([PACKAGE],"$PACKAGE", [Name of package])
#
# Example (in C):
#
# 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);
#
# The AX_DEFINE_SUB_PATHS(varnames) macro looks for the given various
# install-paths that largely depend on either ${prefix} or ${exec_prefix}.
# Just cut out the prefix and ac_define the value. The value is uppercased
# and PATH_ prepended ie. ax_define_sub_paths(bindir libdir pkgdatadir)
# will create the defines PATH_BINDIR PATH_LIBDIR PATH_PKGDATADIR - see
# posix' include/paths.h that creates _PATH_DEV and friends.
#
# LICENSE
#
# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at your
# option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
# Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program. If not, see <http://www.gnu.org/licenses/>.
#
# As a special exception, the respective Autoconf Macro's copyright owner
# gives unlimited permission to copy, distribute and modify the configure
# scripts that are the output of Autoconf when processing the Macro. You
# need not follow the terms of the GNU General Public License when using
# or distributing such scripts, even though portions of the text of the
# Macro appear in them. The GNU General Public License (GPL) does govern
# all other use of the material that constitutes the Autoconf Macro.
#
# This special exception to the GPL applies to versions of the Autoconf
# Macro released by the Autoconf Archive. When you make and distribute a
# modified version of the Autoconf Macro, you may extend this special
# exception to the GPL to apply to your modified version as well.
AU_ALIAS([AC_DEFINE_SUB_PATH], [AX_DEFINE_SUB_PATH])
AC_DEFUN([AX_DEFINE_SUB_PATH],
[dnl
test "_$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, $3))
])
AC_DEFUN([AX_DEFINE_SUB_PATHS],
[dnl
test "_$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]),
])
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