[dpdk-dev] [PATCH 1/6] eal: introduce portable format attribute

[Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>]

When using __attribute__((format(...)) on functions, GCC on Windows
assumes MS-specific format string by default, even if the underlying
stdio implementation is ANSI-compliant (either MS Unicersal CRT
or MinGW implementation). Wrap attribute into a macro that forces
GNU-specific format string when using GCC.

Signed-off-by: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>

diff --git a/lib/librte_eal/common/include/rte_common.h b/lib/librte_eal/common/include/rte_common.h
index 4b5f3a31f..2f086bb9c 100644
--- a/lib/librte_eal/common/include/rte_common.h
+++ b/lib/librte_eal/common/include/rte_common.h
@@ -89,6 +89,21 @@ typedef uint16_t unaligned_uint16_t;
  */
 #define RTE_SET_USED(x) (void)(x)
 
+/**
+ * Check format string and its arguments at compile-time.
+ *
+ * GCC on Windows assumes MS-specific format string by default,
+ * even if the underlying stdio implementation is ANSI-compliant,
+ * so this must be overridden.
+ */
+#if defined(RTE_TOOLCHAIN_GCC)
+#define __rte_format(archetype, format_index, first_arg) \
+	__attribute__((format(gnu_##archetype, format_index, first_arg)))
+#else
+#define __rte_format(archetype, format_index, first_arg) \
+	__attribute__((format(archetype, format_index, first_arg)))
+#endif
+
 #define RTE_PRIORITY_LOG 101
 #define RTE_PRIORITY_BUS 110
 #define RTE_PRIORITY_CLASS 120
-- 
2.25.0