From 206dff3f6ae90157ec68b1773ee39ad41628fd70 Mon Sep 17 00:00:00 2001
From: Bert Belder <bertbelder@gmail.com>
Date: Fri, 8 Dec 2017 23:32:04 +0100
Subject: [PATCH] util: don't redefine static_assert if it's already defined

---
 src/util.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/util.h b/src/util.h
index 3d1c674..6cfee08 100644
--- a/src/util.h
+++ b/src/util.h
@@ -31,10 +31,10 @@ typedef intptr_t ssize_t;
 #define inline __inline
 #endif
 
-#if defined(__clang__) || defined(__GNUC__)
-/* Polyfill static_assert() for clang and gcc. */
+#if !defined(static_assert) && !defined(_MSC_VER)
+/* Polyfill `static_assert` for some versions of clang and gcc. */
 #define static_assert(condition, message) typedef __attribute__( \
-    (unused)) int __static_assert_##__LINE__[(condition) ? 1 : -1];
+    (__unused__)) int __static_assert_##__LINE__[(condition) ? 1 : -1];
 #endif
 
 WEPOLL_INTERNAL void* util_safe_container_of_helper(void* ptr, size_t offset);