more example for macro expansion

Author: flier

tests/headers/attributes.hpp

@@ -1,3 +1,6 @@
+#include <stdint.h>
+#include <stddef.h>
+
 int x __attribute__ ((aligned (16))) = 0;
 
 struct foo { int x[2] __attribute__ ((unused, aligned (8), deprecated)); };
@@ -17,4 +20,41 @@ extern int
 my_printf (void *my_object, const char *my_format, ...)
     __attribute__ ((format (printf, 2, 3)));
 
-void fatal () __attribute__ ((noreturn));
+void fatal () __attribute__ ((noreturn));
+
+/**
+ * Force alignment
+ */
+#define __rte_aligned(a) __attribute__((__aligned__(a)))
+
+/**
+ * Force a structure to be packed
+ */
+#define __rte_packed __attribute__((__packed__))
+
+#define RTE_CACHE_LINE_SIZE 64	/**< Minimum Cache line size. */
+
+/**
+ * Force alignment to cache line.
+ */
+#define __rte_cache_aligned __rte_aligned(RTE_CACHE_LINE_SIZE)
+
+/**
+ * The generic rte_mbuf, containing a packet mbuf.
+ */
+struct rte_mbuf {
+	/** Timesync flags for use with IEEE1588. */
+	uint16_t timesync;
+} __rte_cache_aligned;
+
+/**
+ * Physical memory segment descriptor.
+ */
+struct rte_memseg {
+	uint32_t nchannel;          /**< Number of channels. */
+	uint32_t nrank;             /**< Number of ranks. */
+} __rte_packed;
+
+struct align {
+	int foo;
+} __attribute__((aligned(2 * sizeof(long long))));