https://bugs.swift.org/browse/SR-6812

Author: Marco Chini

CoreFoundation/Base.subproj/CFRuntime.h

@@ -195,10 +195,18 @@ typedef struct __CFRuntimeBase {
     uintptr_t _cfisa;
     uintptr_t _swift_rc;
     // This is for CF's use, and must match _NSCFType layout
+#if __LP64__
     _Atomic(uint64_t) _cfinfoa;
+#else
+    _Atomic(uint32_t) _cfinfoa;
+#endif
 } CFRuntimeBase;
 
+#if __LP64__
 #define INIT_CFRUNTIME_BASE(...) {0, _CF_CONSTANT_OBJECT_STRONG_RC, 0x0000000000000080ULL}
+#else
+#define INIT_CFRUNTIME_BASE(...) {0, _CF_CONSTANT_OBJECT_STRONG_RC, 0x00000080UL}
+#endif
 
 #else
 

CoreFoundation/String.subproj/CFString.h

@@ -156,7 +156,11 @@ struct __CFConstStr {
     struct {
         uintptr_t _cfisa;
         uintptr_t _swift_rc;
+#if defined(__LP64__)
         uint64_t _cfinfoa;
+#else
+        uint32_t _cfinfoa;
+#endif
     } _base;
     uint8_t *_ptr;
 #if defined(__LP64__) && defined(__BIG_ENDIAN__)