1dnl as-ac-expand.m4 0.2.0                                   -*- autoconf -*-
2dnl autostars m4 macro for expanding directories using configure's prefix
3
4dnl (C) 2003, 2004, 2005 Thomas Vander Stichele <thomas at apestaart dot org>
5
6dnl Copying and distribution of this file, with or without modification,
7dnl are permitted in any medium without royalty provided the copyright
8dnl notice and this notice are preserved.
9
10dnl AS_AC_EXPAND(VAR, CONFIGURE_VAR)
11
12dnl example:
13dnl AS_AC_EXPAND(SYSCONFDIR, $sysconfdir)
14dnl will set SYSCONFDIR to /usr/local/etc if prefix=/usr/local
15
16AC_DEFUN([AS_AC_EXPAND],
17[
18  EXP_VAR=[$1]
19  FROM_VAR=[$2]
20
21  dnl first expand prefix and exec_prefix if necessary
22  prefix_save=$prefix
23  exec_prefix_save=$exec_prefix
24
25  dnl if no prefix given, then use /usr/local, the default prefix
26  if test "x$prefix" = "xNONE"; then
27    prefix="$ac_default_prefix"
28  fi
29  dnl if no exec_prefix given, then use prefix
30  if test "x$exec_prefix" = "xNONE"; then
31    exec_prefix=$prefix
32  fi
33
34  full_var="$FROM_VAR"
35  dnl loop until it doesn't change anymore
36  while true; do
37    new_full_var="`eval echo $full_var`"
38    if test "x$new_full_var" = "x$full_var"; then break; fi
39    full_var=$new_full_var
40  done
41
42  dnl clean up
43  full_var=$new_full_var
44  AC_SUBST([$1], "$full_var")
45
46  dnl restore prefix and exec_prefix
47  prefix=$prefix_save
48  exec_prefix=$exec_prefix_save
49])
50