1 files changed, 34 insertions, 0 deletions
diff --git a/m4/as-ac-expand.m4 b/m4/as-ac-expand.m4
new file mode 100644
index 0000000..89c90c0
--- /dev/null
+++ b/m4/as-ac-expand.m4
@@ -0,0 +1,34 @@
+dnl AS_AC_EXPAND(VAR, CONFIGURE_VAR)
+dnl example
+dnl AS_AC_EXPAND(SYSCONFDIR, $sysconfdir)
+dnl will set SYSCONFDIR to /usr/local/etc
+
+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$exec_prefix" = "xNONE"; then
+    exec_prefix=/usr/local
+  fi
+
+  full_var="$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
+  AC_SUBST([$1], "$full_var")
+  prefix=$prefix_save
+  exec_prefix=$exec_prefix_save
+])