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dnl AS_AC_EXPAND(VAR, CONFIGURE_VAR)
dnl example
dnl AS_AC_EXPAND(SYSCONFDIR, $sysconfdir)
dnl will set SYSCONFDIR to /usr/local/etc
dnl written by thomas vander stichele
AC_DEFUN([AS_AC_EXPAND],
[
EXP_VAR=[$1]
FROM_VAR=[$2]
dnl first expand prefix and exec_prefix if necessary
prefix_save=$prefix
if test "x$prefix" = "xNONE"; then
prefix=/usr/local
fi
exec_prefix_save=$exec_prefix
if test "x$exec_prefix" = "xNONE"; then
if test "x$prefix_save" = "xNONE"; then
exec_prefix=/usr/local
else
exec_prefix=$prefix
fi
fi
full_var="$FROM_VAR"
dnl loop until it doesn't change anymore
while true; do
new_full_var="`eval echo $full_var`"
if test "x$new_full_var" = "x$full_var"; then break; fi
full_var=$new_full_var
done
dnl clean up
full_var=$new_full_var
[$1]=$full_var
prefix=$prefix_save
exec_prefix=$exec_prefix_save
])
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