sys/posix: use '#max_field_align'

core/sys/posix/sys_msg.odin

@@ -64,28 +64,22 @@ when ODIN_OS == .Darwin {
 
 	MSG_NOERROR :: 0o10000
 
-	// NOTE: this is #pragma pack(4)
-
-	msqid_ds :: struct #align(4) {
-		msg_perm:   ipc_perm,             /* [PSX] operation permission structure */
+	msqid_ds :: struct #max_field_align(4) {
+		msg_perm:   ipc_perm,     /* [PSX] operation permission structure */
 		msg_first:  c.int32_t,
 		msg_last:   c.int32_t,
 		msg_cbytes: msglen_t,
-		msg_qnum:   msgqnum_t,            /* [PSX] number of messages currently on queue */
-		msg_qbytes: msglen_t,             /* [PSX] maximum number of bytes allowed on queue */
-		msg_lspid:  pid_t,                /* [PSX] process ID of last msgsnd() */
-		msg_lrpid:  pid_t,                /* [PSX] process ID of last msgrcv() */
-		msg_stime:  time_t,               /* [PSX] time of last msgsnd() */
+		msg_qnum:   msgqnum_t,    /* [PSX] number of messages currently on queue */
+		msg_qbytes: msglen_t,     /* [PSX] maximum number of bytes allowed on queue */
+		msg_lspid:  pid_t,        /* [PSX] process ID of last msgsnd() */
+		msg_lrpid:  pid_t,        /* [PSX] process ID of last msgrcv() */
+		msg_stime:  time_t,       /* [PSX] time of last msgsnd() */
 		msg_pad1:   c.int32_t,
-		using _: struct #align(4) {
-			msg_rtime:  time_t,           /* [PSX] time of last msgrcv() */
-			msg_pad2:   c.int32_t,
-			using _: struct #align(4) {
-				msg_ctime:  time_t,       /* [PSX] time of last change */
-				msg_pad3:   c.int32_t,
-				msg_pad4:   [4]c.int32_t,
-			},
-		},
+		msg_rtime:  time_t,       /* [PSX] time of last msgrcv() */
+		msg_pad2:   c.int32_t,
+		msg_ctime:  time_t,       /* [PSX] time of last change */
+		msg_pad3:   c.int32_t,
+		msg_pad4:   [4]c.int32_t,
 	}
 
 } else when ODIN_OS == .FreeBSD {

core/sys/posix/sys_sem.odin

@@ -79,19 +79,15 @@ when ODIN_OS == .Darwin || ODIN_OS == .FreeBSD || ODIN_OS == .NetBSD || ODIN_OS
 	SETALL  :: 9
 
 	when ODIN_OS == .Darwin {
-		// NOTE: this is #pragma pack(4)
-
-		semid_ds :: struct #align(4) {
-			sem_perm:  ipc_perm,         /* [PSX] operation permission structure */
-			sem_base:  c.int32_t,        /* 32 bit base ptr for semaphore set */
-			sem_nsems: c.ushort,         /* [PSX] number of semaphores in set */
-			sem_otime: time_t,           /* [PSX] last semop() */
+		semid_ds :: struct #max_field_align(4) {
+			sem_perm:  ipc_perm,     /* [PSX] operation permission structure */
+			sem_base:  c.int32_t,    /* 32 bit base ptr for semaphore set */
+			sem_nsems: c.ushort,     /* [PSX] number of semaphores in set */
+			sem_otime: time_t,       /* [PSX] last semop() */
 			sem_pad1:  c.int32_t,
-			using _: struct #align(4) {
-				sem_ctime: time_t,       /* [PSX] last time changed by semctl() */
-				sem_pad2:  c.int32_t,
-				sem_pad3:  [4]c.int32_t,
-			},
+			sem_ctime: time_t,       /* [PSX] last time changed by semctl() */
+			sem_pad2:  c.int32_t,
+			sem_pad3:  [4]c.int32_t,
 		}
 	} else when ODIN_OS == .FreeBSD {
 		semid_ds :: struct {

core/sys/posix/sys_shm.odin

@@ -67,20 +67,16 @@ when ODIN_OS == .Darwin {
 
 	shmatt_t :: distinct c.ushort
 
-	// NOTE: this is #pragma pack(4)
-
-	shmid_ds :: struct #align(4) {
-		shm_perm:     ipc_perm,     /* [PSX] operation permission structure */
-		shm_segsz:    c.size_t,     /* [PSX] size of segment in bytes */
-		shm_lpid:     pid_t,        /* [PSX] process ID of last shared memory operation */
-		shm_cpid:     pid_t,        /* [PSX] process ID of creator */
-		shm_nattch:   shmatt_t,     /* [PSX] number of current attaches */
-		using _: struct #align(4) {
-			shm_atime:    time_t,   /* [PSX] time of last shmat() */
-			shm_dtime:    time_t,   /* [PSX] time of last shmdt() */
-			shm_ctime:    time_t,   /* [PSX] time of last change by shmctl() */
-			shm_internal: rawptr,
-		},
+	shmid_ds :: struct #max_field_align(4) {
+		shm_perm:     ipc_perm, /* [PSX] operation permission structure */
+		shm_segsz:    c.size_t, /* [PSX] size of segment in bytes */
+		shm_lpid:     pid_t,    /* [PSX] process ID of last shared memory operation */
+		shm_cpid:     pid_t,    /* [PSX] process ID of creator */
+		shm_nattch:   shmatt_t, /* [PSX] number of current attaches */
+		shm_atime:    time_t,   /* [PSX] time of last shmat() */
+		shm_dtime:    time_t,   /* [PSX] time of last shmdt() */
+		shm_ctime:    time_t,   /* [PSX] time of last change by shmctl() */
+		shm_internal: rawptr,
 	}
 
 } else when ODIN_OS == .FreeBSD || ODIN_OS == .NetBSD {