Fix __attribute__ (#9)

* Test

Signed-off-by: Pablo Garrido <pablogs9@gmail.com>

* Revert "Test"

This reverts commit 02112c6.

* Update

Signed-off-by: Pablo Garrido <pablogs9@gmail.com>

Author: pablogs9

platform_code/micro_ros_platformio.h

@@ -2,11 +2,21 @@
 #ifndef MICRO_ROS_PLATFORMIO
 #define MICRO_ROS_PLATFORMIO
 
+#include <uxr/client/transport.h>
+
+// In GNU C < 6.0.0 __attribute__((deprecated(msg))) is not supported for enums, used in rmw/types.h
+#if __GNUC__ < 6
+#define aux__attribute__(x) __attribute__(x)
 #define __attribute__(x)
+#endif
 
-#include <uxr/client/transport.h>
 #include <rmw_microros/rmw_microros.h>
 
+#if __GNUC__ < 6
+#undef __attribute__
+#define __attribute__(x) aux__attribute__(x)
+#endif
+
 #ifdef __cplusplus
 extern "C"
 {