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--- a/src/fcatomic.h 2020-11-27 13:23:44.000000000 +0900
+++ b/src/fcatomic.h 2020-11-27 13:24:43.000000000 +0900
@@ -70,24 +70,25 @@
#elif !defined(FC_NO_MT) && defined(__APPLE__)
#include <libkern/OSAtomic.h>
-#ifdef __MAC_OS_X_MIN_REQUIRED
#include <AvailabilityMacros.h>
-#elif defined(__IPHONE_OS_MIN_REQUIRED)
-#include <Availability.h>
-#endif
typedef int fc_atomic_int_t;
#define fc_atomic_int_add(AI, V) (OSAtomicAdd32Barrier ((V), &(AI)) - (V))
-#define fc_atomic_ptr_get(P) (OSMemoryBarrier (), (void *) *(P))
-#if (MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_4 || __IPHONE_VERSION_MIN_REQUIRED >= 20100)
-#define fc_atomic_ptr_cmpexch(P,O,N) OSAtomicCompareAndSwapPtrBarrier ((void *) (O), (void *) (N), (void **) (P))
-#else
-#if __ppc64__ || __x86_64__
-#define fc_atomic_ptr_cmpexch(P,O,N) OSAtomicCompareAndSwap64Barrier ((int64_t) (O), (int64_t) (N), (int64_t*) (P))
+#if (MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_4 || __IPHONE_OS_VERSION_MIN_REQUIRED >= 20100)
+
+#if SIZEOF_VOID_P == 8
+#define fc_atomic_ptr_get(P) OSAtomicAdd64Barrier (0, (int64_t*)(P))
+#elif SIZEOF_VOID_P == 4
+#define fc_atomic_ptr_get(P) OSAtomicAdd32Barrier (0, (int32_t*)(P))
#else
-#define fc_atomic_ptr_cmpexch(P,O,N) OSAtomicCompareAndSwap32Barrier ((int32_t) (O), (int32_t) (N), (int32_t*) (P))
+#error "SIZEOF_VOID_P not 4 or 8 (assumes CHAR_BIT is 8)"
#endif
+
+#define fc_atomic_ptr_cmpexch(P,O,N) OSAtomicCompareAndSwapPtrBarrier ((void *) (O), (void *) (N), (void **) (P))
+
+#else
+#error "Your macOS / iOS targets are too old"
#endif
#elif !defined(FC_NO_MT) && defined(HAVE_INTEL_ATOMIC_PRIMITIVES)
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