Fix macOS x86_64 + arm64 interoperability

common/jack/systemdeps.h

@@ -124,10 +124,10 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 
 #endif /* __APPLE__ || __linux__ || __sun__ || sun */
 
-#if defined(__arm__) || defined(__aarch64__) || defined(__mips__) || defined(__ppc__) || defined(__powerpc__)
+#if (defined(__arm__) || defined(__aarch64__) || defined(__mips__) || defined(__ppc__) || defined(__powerpc__)) && !defined(__APPLE__)
     #undef POST_PACKED_STRUCTURE
     #define POST_PACKED_STRUCTURE
-#endif /* __arm__ || __aarch64__ || __ppc__ || __powerpc__ */
+#endif /* __arm__ || __aarch64__ || __mips__ || __ppc__ || __powerpc__ */
 
 /** define JACK_LIB_EXPORT, useful for internal clients */
 #if defined(_WIN32)

common/shm.h

@@ -105,7 +105,12 @@ extern "C"
         shm_ANDROID = 4			/* Android shared memory */
     } jack_shmtype_t;
 
+#ifdef __APPLE__
+    /* we need to align and pack data to 32bit so that x86_64 and arm64 work together */
+    typedef int32_t jack_shm_registry_index_t;
+#else
     typedef int16_t jack_shm_registry_index_t;
+#endif
 
     /**
      * A structure holding information about shared memory allocated by