[PATCH v4 01/26] eal/common: add token concatenation macro

[Anatoly Burakov]

Add `RTE_CONCAT()` macro to enable token concatenation with proper macro
expansion.

Signed-off-by: Anatoly Burakov <anatoly.burakov at intel.com>
---
 lib/eal/include/rte_common.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/eal/include/rte_common.h b/lib/eal/include/rte_common.h
index 0a356abae2..05e72e500e 100644
--- a/lib/eal/include/rte_common.h
+++ b/lib/eal/include/rte_common.h
@@ -918,6 +918,10 @@ __extension__ typedef uint64_t RTE_MARKER64[0];
 /** Take a macro value and get a string version of it */
 #define RTE_STR(x) _RTE_STR(x)
 
+/** Concatenate two tokens after expanding macros in both. */
+#define _RTE_CONCAT2(a, b) a ## b
+#define RTE_CONCAT(a, b) _RTE_CONCAT2(a, b)
+
 /**
  * ISO C helpers to modify format strings using variadic macros.
  * This is a replacement for the ", ## __VA_ARGS__" GNU extension.
-- 
2.47.3