From 1fa3f197f65e8eceeaed5aff1f16f789b911df32 Mon Sep 17 00:00:00 2001
From: Jo-Philipp Wich <jow@openwrt.org>
Date: Wed, 29 Dec 2010 09:39:09 +0000
Subject: missing-macros: add as-ac-expand.m4

SVN-Revision: 24846
---
 tools/missing-macros/Makefile               |  2 +-
 tools/missing-macros/src/README             |  6 ++++
 tools/missing-macros/src/m4/as-ac-expand.m4 | 43 +++++++++++++++++++++++++++++
 3 files changed, 50 insertions(+), 1 deletion(-)
 create mode 100644 tools/missing-macros/src/m4/as-ac-expand.m4

diff --git a/tools/missing-macros/Makefile b/tools/missing-macros/Makefile
index 4f7564662f..1d2726d5d5 100644
--- a/tools/missing-macros/Makefile
+++ b/tools/missing-macros/Makefile
@@ -8,7 +8,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=missing-macros
-PKG_VERSION:=6
+PKG_VERSION:=7
 
 include $(INCLUDE_DIR)/host-build.mk
 
diff --git a/tools/missing-macros/src/README b/tools/missing-macros/src/README
index 9d9fbfa844..04d8a06c8f 100644
--- a/tools/missing-macros/src/README
+++ b/tools/missing-macros/src/README
@@ -61,6 +61,12 @@ XMMS feature detection macros.
   xmms.m4
 
 
+From ao:
+Directory expansion macro for Automake.
+
+  as-ac-expand.m4
+
+
 From OpenWrt:
 Always disable GTK docs.
 
diff --git a/tools/missing-macros/src/m4/as-ac-expand.m4 b/tools/missing-macros/src/m4/as-ac-expand.m4
new file mode 100644
index 0000000000..d6c9e33060
--- /dev/null
+++ b/tools/missing-macros/src/m4/as-ac-expand.m4
@@ -0,0 +1,43 @@
+dnl as-ac-expand.m4 0.2.0
+dnl autostars m4 macro for expanding directories using configure's prefix
+dnl thomas@apestaart.org
+
+dnl AS_AC_EXPAND(VAR, CONFIGURE_VAR)
+dnl example
+dnl AS_AC_EXPAND(SYSCONFDIR, $sysconfdir)
+dnl will set SYSCONFDIR to /usr/local/etc if prefix=/usr/local
+
+AC_DEFUN([AS_AC_EXPAND],
+[
+  EXP_VAR=[$1]
+  FROM_VAR=[$2]
+
+  dnl first expand prefix and exec_prefix if necessary
+  prefix_save=$prefix
+  exec_prefix_save=$exec_prefix
+
+  dnl if no prefix given, then use /usr/local, the default prefix
+  if test "x$prefix" = "xNONE"; then
+    prefix="$ac_default_prefix"
+  fi
+  dnl if no exec_prefix given, then use prefix
+  if test "x$exec_prefix" = "xNONE"; then
+    exec_prefix=$prefix
+  fi
+
+  full_var="$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")
+
+  dnl restore prefix and exec_prefix
+  prefix=$prefix_save
+  exec_prefix=$exec_prefix_save
+])
-- 
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