[dpdk-dev] [PATCH v2 1/6] lib/eal: add a common wrapper for restricted pointers

[Joyce Kong <joyce.kong@arm.com>]

The 'restrict' keyword is recognized in C99, while type qulifier
'__restrict' compiles ok in C with all language levels. This patch
is to add a wrapper defining '__rte_restrict' with 'restrict' and
'__restrict' to be supported by all compilers.

Signed-off-by: Joyce Kong <joyce.kong@arm.com>
---
 lib/librte_eal/include/rte_common.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/lib/librte_eal/include/rte_common.h b/lib/librte_eal/include/rte_common.h
index 0843ce69e..cda32c056 100644
--- a/lib/librte_eal/include/rte_common.h
+++ b/lib/librte_eal/include/rte_common.h
@@ -103,6 +103,16 @@ typedef uint16_t unaligned_uint16_t;
  */
 #define __rte_unused __attribute__((__unused__))
 
+/**
+ * Define a wrapper for restricted pointers which can be supported
+ * by all compilers.
+ */
+#if __STDC_VERSION__ >= 199901
+#define __rte_restrict restrict
+#else
+#define __rte_restrict __restrict
+#endif
+
 /**
  * definition to mark a variable or function parameter as used so
  * as to avoid a compiler warning
-- 
2.27.0