From b29328732ecdf7cfff9d37fe083bf6f7195c8b1b Mon Sep 17 00:00:00 2001
From: Joergen Ibsen <ji@ibse.dk>
Date: Wed, 15 Jun 2016 10:02:36 +0200
Subject: [PATCH] Add workaround for atomics with Clang on Windows

Clang 3.8.0 on mingw-w64 advertises support for both C11 and Clang
atomics, but only Clang atomics work. With Clang/C2 neither works.

http://llvm.org/bugs/show_bug.cgi?id=26911
https://github.com/quixdb/squash/issues/185
---
 munit.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/munit.c b/munit.c
index b97b048..d13590c 100644
--- a/munit.c
+++ b/munit.c
@@ -277,6 +277,14 @@ munit_malloc_ex(const char* filename, int line, size_t size) {
 #  endif
 #endif
 
+/* Workaround for http://llvm.org/bugs/show_bug.cgi?id=26911 */
+#if defined(__clang__) && defined(_WIN32)
+#  undef HAVE_STDATOMIC
+#  if defined(__c2__)
+#    undef HAVE_CLANG_ATOMICS
+#  endif
+#endif
+
 #if defined(HAVE_STDATOMIC)
 #  include <stdatomic.h>
 #  define ATOMIC_UINT32_T _Atomic uint32_t