[PATCH 1/2] config: add compatibility for old compilers with new UAPI headers

[Maxime Coquelin <maxime.coquelin@redhat.com>]

This patch adds a compatibility define for __counted_by attribute,
which is not present in older compilers but required for recent UAPI
headers like vfio.h.

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
 config/rte_config.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/config/rte_config.h b/config/rte_config.h
index 0447cdf2ad..307e7dac62 100644
--- a/config/rte_config.h
+++ b/config/rte_config.h
@@ -25,6 +25,15 @@
 #define RTE_TOOLCHAIN_MSVC 1
 #endif
 
+/*
+ * Compatibility define for Linux kernel UAPI headers that may use __counted_by
+ * attribute for bounds checking. This attribute is not understood by userspace
+ * compilers, so define it as empty if not already provided.
+ */
+#ifndef __counted_by
+#define __counted_by(m)
+#endif
+
 /* legacy defines */
 #ifdef RTE_EXEC_ENV_LINUX
 #define RTE_EXEC_ENV_LINUXAPP 1
-- 
2.55.0