ringbuffer: use a namespace for ringbuffer to avoid 'multiple definitions in vtable' bug

src/drivers/device/module.mk

@@ -41,7 +41,8 @@ SRCS =		  \
 		  cdev.cpp \
 		  i2c_nuttx.cpp \
 		  pio.cpp \
-		  spi.cpp 
+		  spi.cpp \
+		  ringbuffer.cpp
 else
 SRCS =		  \
 		  device_posix.cpp \
@@ -50,5 +51,5 @@ SRCS =		  \
 		  vdev_posix.cpp \
 		  i2c_posix.cpp  \
 		  sim.cpp \
-		  ringbuffer.cpp 
+		  ringbuffer.cpp
 endif

src/drivers/device/ringbuffer.cpp

@@ -1,6 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (C) 2013 PX4 Development Team. All rights reserved.
+ *   Copyright (C) 2013-2015 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -40,6 +40,9 @@
 #include "ringbuffer.h"
 #include <string.h>
 
+namespace ringbuffer
+{
+
 RingBuffer::RingBuffer(unsigned num_items, size_t item_size) :
 	_num_items(num_items),
 	_item_size(item_size),
@@ -398,3 +401,5 @@ RingBuffer::print_info(const char *name)
 	       _tail,
 	       _buf);
 }
+
+} // namespace ringbuffer

src/drivers/device/ringbuffer.h

@@ -1,6 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (C) 2013 PX4 Development Team. All rights reserved.
+ *   Copyright (C) 2013-2015 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -43,6 +43,9 @@
 #include <stdint.h>
 #include <stdio.h>
 
+namespace ringbuffer __EXPORT
+{
+
 class RingBuffer {
 public:
 	RingBuffer(unsigned ring_size, size_t entry_size);
@@ -172,9 +175,4 @@ private:
 	RingBuffer operator=(const RingBuffer&);
 };
 
-#ifdef __PX4_NUTTX
-// Not sure why NuttX requires these to be defined in the header file
-// but on other targets it causes a problem with multiple definitions
-// at link time
-#include "ringbuffer.cpp"
-#endif
+} // namespace ringbuffer