[dpdk-dev] [PATCH v3 08/10] eal/windows: fix rte_page_sizes with Clang on Windows

[Dmitry Kozlyuk]

Clang on Windows follows MS ABI where enum values are limited to 2^31-1.
Enum rte_page_size has members valued above this limit, which get
wrapped to zero, resulting in compilation error (duplicate values in
enum). Using MS ABI is mandatory for Windows EAL to call Win32 APIs.

Define these values outside of the enum for Clang on Windows only.
This does not affect runtime, because Windows doesn't run on machines
with 4GiB and 16GiB hugepages.

Signed-off-by: Dmitry Kozlyuk <dmitry.kozliuk at gmail.com>
---
 lib/librte_eal/include/rte_memory.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/librte_eal/include/rte_memory.h b/lib/librte_eal/include/rte_memory.h
index 1b7c3e5df..3ec673f51 100644
--- a/lib/librte_eal/include/rte_memory.h
+++ b/lib/librte_eal/include/rte_memory.h
@@ -34,8 +34,14 @@ enum rte_page_sizes {
 	RTE_PGSIZE_256M  = 1ULL << 28,
 	RTE_PGSIZE_512M  = 1ULL << 29,
 	RTE_PGSIZE_1G    = 1ULL << 30,
+/* Work around Clang on Windows being limited to 32-bit underlying type. */
+#if !defined(RTE_CC_CLANG) || !defined(RTE_EXEC_ENV_WINDOWS)
 	RTE_PGSIZE_4G    = 1ULL << 32,
 	RTE_PGSIZE_16G   = 1ULL << 34,
+#else
+#define RTE_PGSIZE_4G  (1ULL << 32)
+#define RTE_PGSIZE_16G (1ULL << 34)
+#endif
 };
 
 #define SOCKET_ID_ANY -1                    /**< Any NUMA socket. */
-- 
2.25.1