Merge topic 'libuv-mingw-arm'

1aba3a83 libuv: Fix building with mingw toolchains for ARM/AArch64

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !6354

Utilities/cmlibuv/src/win/atomicops-inl.h

@@ -39,10 +39,11 @@ static char INLINE uv__atomic_exchange_set(char volatile* target) {
   return _InterlockedOr8(target, 1);
 }
 
-#else /* GCC */
+#else /* GCC, Clang in mingw mode */
 
-/* Mingw-32 version, hopefully this works for 64-bit gcc as well. */
 static inline char uv__atomic_exchange_set(char volatile* target) {
+#if defined(__i386__) || defined(__x86_64__)
+  /* Mingw-32 version, hopefully this works for 64-bit gcc as well. */
   const char one = 1;
   char old_value;
   __asm__ __volatile__ ("lock xchgb %0, %1\n\t"
@@ -50,6 +51,9 @@ static inline char uv__atomic_exchange_set(char volatile* target) {
                         : "0"(one), "m"(*target)
                         : "memory");
   return old_value;
+#else
+  return __sync_fetch_and_or(target, 1);
+#endif
 }
 
 #endif