BSD-license-compatible, and NO_STACK build variants

ext/lwip/doc/doxygen/generate.bat

@@ -0,0 +1 @@
+doxygen lwip.Doxyfile

ext/lwip/doc/doxygen/generate.sh

@@ -0,0 +1 @@
+doxygen lwip.Doxyfile

ext/lwip/doc/doxygen/main_page.h

@@ -0,0 +1,32 @@
+/**
+ * @defgroup lwip lwIP
+ *
+ * @defgroup infrastructure Infrastructure
+ *
+ * @defgroup callbackstyle_api Callback-style APIs
+ * Non thread-safe APIs, callback style for maximum performance and minimum
+ * memory footprint.
+ * 
+ * @defgroup threadsafe_api Thread-safe APIs
+ * Thread-safe APIs, blocking functions. More overhead, but can be called
+ * from any thread except TCPIP thread.
+ * 
+ * @defgroup addons Addons
+ * 
+ * @defgroup apps Applications
+ */
+
+/**
+ * @mainpage Overview
+ * @verbinclude "README"
+ */
+
+/**
+ * @page upgrading Upgrading
+ * @verbinclude "UPGRADING"
+ */
+
+/**
+ * @page contrib How to contribute to lwIP
+ * @verbinclude "contrib.txt"
+ */