In one of the next patches, we'll introduce ARRAY_SIZE in
"MdePkg/Include/Base.h". In order to proceed in small steps, make the
module-local definition of ARRAY_SIZE conditional. This way the
introduction of the macro under MdePkg will silently switch this module
over (after which we can remove the module-local definition completely).

Cc: Gary Lin <g...@suse.com>
Cc: Jordan Justen <jordan.l.jus...@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <ler...@redhat.com>
---
 OvmfPkg/XenBusDxe/XenStore.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/OvmfPkg/XenBusDxe/XenStore.c b/OvmfPkg/XenBusDxe/XenStore.c
index b7ae1d04863d..9eeb6f54fb50 100644
--- a/OvmfPkg/XenBusDxe/XenStore.c
+++ b/OvmfPkg/XenBusDxe/XenStore.c
@@ -713,7 +713,9 @@ static XenStoreErrors gXenStoreErrors[] = {
   { XENSTORE_STATUS_EISCONN, "EISCONN" },
   { XENSTORE_STATUS_E2BIG, "E2BIG" }
 };
+#ifndef ARRAY_SIZE
 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
+#endif
 
 STATIC
 XENSTORE_STATUS
-- 
2.9.2


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