use autotools for building the project
[jackfield.git] / acinclude.m4
blob0c71173933f8c7a9f6b95a272b97b97df24f99ee
1 dnl AS_AC_EXPAND(VAR, CONFIGURE_VAR)
2 dnl
3 dnl example
4 dnl AS_AC_EXPAND(SYSCONFDIR, $sysconfdir)
5 dnl will set SYSCONFDIR to /usr/local/etc if prefix=/usr/local
7 AC_DEFUN([AS_AC_EXPAND],
9   EXP_VAR=[$1]
10   FROM_VAR=[$2]
12   dnl first expand prefix and exec_prefix if necessary
13   prefix_save=$prefix
14   exec_prefix_save=$exec_prefix
16   dnl if no prefix given, then use /usr/local, the default prefix
17   if test "x$prefix" = "xNONE"; then
18     prefix=$ac_default_prefix
19   fi
20   dnl if no exec_prefix given, then use prefix
21   if test "x$exec_prefix" = "xNONE"; then
22     exec_prefix=$prefix
23   fi
25   full_var="$FROM_VAR"
26   dnl loop until it doesn't change anymore
27   while true; do
28     new_full_var="`eval echo $full_var`"
29     if test "x$new_full_var"="x$full_var"; then break; fi
30     full_var=$new_full_var
31   done
33   dnl clean up
34   full_var=$new_full_var
35   AC_SUBST([$1], "$full_var")
37   dnl restore prefix and exec_prefix
38   prefix=$prefix_save
39   exec_prefix=$exec_prefix_save