From 6f2cc232b8d69546c6ec1df486125b47dc879b9f Mon Sep 17 00:00:00 2001
From: Steve MacLean <Steve.MacLean@Microsoft.com>
Date: Thu, 21 May 2020 23:34:14 -0400
Subject: Define UNW_EMPTY_STRUCT for non-GNUC

---
 include/libunwind-aarch64.h | 6 +++++-
 include/libunwind-arm.h     | 6 +++++-
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/include/libunwind-aarch64.h b/include/libunwind-aarch64.h
index 797b13c0..db01a9f6 100644
--- a/include/libunwind-aarch64.h
+++ b/include/libunwind-aarch64.h
@@ -37,7 +37,11 @@ extern "C" {
 #include <stdalign.h>
 
 #ifndef UNW_EMPTY_STRUCT
-# define UNW_EMPTY_STRUCT
+#  ifdef __GNUC__
+#    define UNW_EMPTY_STRUCT
+#  else
+#    define UNW_EMPTY_STRUCT uint8_t unused;
+#  endif
 #endif
 
 #define UNW_TARGET      aarch64
diff --git a/include/libunwind-arm.h b/include/libunwind-arm.h
index ea14577b..1a6c6b6d 100644
--- a/include/libunwind-arm.h
+++ b/include/libunwind-arm.h
@@ -33,7 +33,11 @@ extern "C" {
 #include <stddef.h>
 
 #ifndef UNW_EMPTY_STRUCT
-# define UNW_EMPTY_STRUCT
+#  ifdef __GNUC__
+#    define UNW_EMPTY_STRUCT
+#  else
+#    define UNW_EMPTY_STRUCT uint8_t unused;
+#  endif
 #endif
 
 #define UNW_TARGET      arm
-- 
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