define malloc attribute

src/include/compiler.h

@@ -298,6 +298,12 @@ extern void dbg_hex_dump_da ( unsigned long dispaddr,
  */
 #define __nonnull __attribute__ (( nonnull ))
 
+/**
+ * Declare a pointer returned by a function as a unique memory address
+ * as returned by malloc-type functions.
+ */
+#define __malloc __attribute__ (( malloc ))
+
 /**
  * Declare a function as used.
  *