Resolve a number of GCC-generated warnings

The warnings in test47 seem to be a symptom of a larger problem,
i.e., not an issue with the test set code but rather with the GCC
configuration.  Hopefully the switch to LLVM will resolve those.

Change-Id: Ic9fa3b8bc9b728947c993f2e1ed49d9a3b731344

minix/commands/partition/partition.c

@@ -376,7 +376,7 @@ void distribute(void)
 				if (base > pe->lowsec) {
 					fprintf(stderr,
 	"%s: fixed partition %u is preceded by too big partitions/holes\n",
-						arg0, ((pe - table) - 1) / 2);
+				arg0, ((unsigned int)(pe - table) - 1) / 2);
 					exit(1);
 				}
 				exp= nil;	/* XXX - Extend before? */

minix/tests/test48.c

@@ -495,7 +495,7 @@ static int buflens[] = { 0, 1, 2, 3, 4, 5, 6, 9, 10, 11, 255 };
 static void test_getnameinfo_all(void)
 {
 	int flag_NUMERICHOST, flag_NAMEREQD, flag_NUMERICSERV, flag_DGRAM;
-	int exp_results, flagcount, flags, i, j, k, l, socktypemismatch;
+	int exp_results, flagcount, flags, i, j, k, l;
 	const char *nodename, *servname;
 
 	/* set ports servent structs */
@@ -555,10 +555,6 @@ static void test_getnameinfo_all(void)
 		if (buflens[k] > 0 && buflens[k] <= strlen(nodename))
 			exp_results |= (1 << EAI_OVERFLOW) | (1 << EAI_MEMORY);
 
-		socktypemismatch =
-			(flag_DGRAM && ports[j].socktype == SOCK_STREAM) ||
-			(!flag_DGRAM && ports[j].socktype == SOCK_DGRAM);
-
 		struct servent *se = flag_DGRAM ? ports[j].se_udp : ports[j].se_tcp;
 
 		servname = (flag_NUMERICSERV) ?

minix/tests/test53.c

@@ -166,6 +166,13 @@ static void testmul(void)
 	}
 }
 
+static void do_not_optimize_away(volatile u64_t * ptr)
+{
+
+	/* TODO: does this actually do the job? */
+	*ptr ^= 1;
+}
+
 static void testdiv0(void)
 {
 	int funcidx;
@@ -187,6 +194,8 @@ static void testdiv0(void)
 				default: assert(0);		ERR; break;
 			}
 
+			do_not_optimize_away((volatile u64_t *)&res);
+
 			/* if we reach this point there was no signal and an
 			 * error has been recorded
 			 */

minix/tests/test67.c

@@ -171,7 +171,7 @@ start_socket_server(int port)
 #if !defined(__minix)
 	int yes = 1;
 #endif
-	int fd_sock, fd_new, r;
+	int fd_sock, fd_new;
 	struct sockaddr_in my_addr;
 	struct sockaddr_in other_addr;
 	socklen_t other_size;
@@ -220,7 +220,7 @@ start_socket_server(int port)
 		e(5);
 	}
 
-	r = read(fd_new, buf, sizeof(buf));
+	(void)read(fd_new, buf, sizeof(buf));
 	exit(0);
 }
 

minix/tests/test74.c

@@ -201,16 +201,14 @@ static void do_readlink2(void *buf, int fd, int writable)
 
 static void do_symlink1(void *buf, int fd, int writable)
 {
-	int r;
 	/* the system call just has to fail gracefully */
-	r = symlink(buf, NODENAME);
+	(void)symlink(buf, NODENAME);
 }
 
 static void do_symlink2(void *buf, int fd, int writable)
 {
-	int r;
 	/* the system call just has to fail gracefully */
-	r = symlink(NODENAME, buf);
+	(void)symlink(NODENAME, buf);
 }
 
 static void do_open(void *buf, int fd, int writable)
@@ -223,26 +221,23 @@ static void do_open(void *buf, int fd, int writable)
 
 static void do_select1(void *buf, int fd, int writable)
 {
-	int r;
 	struct timeval timeout = { 0, 200000 };	/* 0.2 sec */
 	/* the system call just has to fail gracefully */
-	r = select(1, buf, NULL, NULL, &timeout);
+	(void)select(1, buf, NULL, NULL, &timeout);
 }
 
 static void do_select2(void *buf, int fd, int writable)
 {
-	int r;
 	struct timeval timeout = { 0, 200000 };	/* 1 sec */
 	/* the system call just has to fail gracefully */
-	r = select(1, NULL, buf, NULL, &timeout);
+	(void)select(1, NULL, buf, NULL, &timeout);
 }
 
 static void do_select3(void *buf, int fd, int writable)
 {
-	int r;
 	struct timeval timeout = { 0, 200000 };	/* 1 sec */
 	/* the system call just has to fail gracefully */
-	r = select(1, NULL, NULL, buf, &timeout);
+	(void)select(1, NULL, NULL, buf, &timeout);
 }
 
 static void fillfile(int fd, int size)

minix/tests/test87.c

@@ -150,7 +150,7 @@ test87a(void)
 	pid_t pid;
 	u_quad_t q;
 	bool b, b2;
-	int i, va[2], lastva, mib[CTL_MAXNAME + 1];
+	int i, va[2], lastva = -1 /*gcc*/, mib[CTL_MAXNAME + 1];
 
 	subtest = 0;
 
@@ -1668,7 +1668,7 @@ test87c(void)
 	if (errno != EINVAL) e(0);
 
 	memcpy(&scn, &tmpscn, sizeof(scn));
-	scn.sysctl_size = SSIZE_MAX + 1;
+	scn.sysctl_size = (size_t)SSIZE_MAX + 1;
 	if (sysctl(mib, 3, NULL, NULL, &scn, sizeof(scn)) != -1) e(0);
 	if (errno != EINVAL) e(0);
 
@@ -1806,7 +1806,7 @@ test87c(void)
 	if (errno != EINVAL) e(0);
 
 	memcpy(&scn, &tmpscn, sizeof(scn));
-	scn.sysctl_size = SSIZE_MAX + 1;
+	scn.sysctl_size = (size_t)SSIZE_MAX + 1;
 	if (sysctl(mib, 3, NULL, NULL, &scn, sizeof(scn)) != -1) e(0);
 	if (errno != EINVAL) e(0);
 
@@ -2950,14 +2950,17 @@ test87f(void)
  * contents match expectations, or -1 if they do not.
  */
 static int
-test_buf(unsigned char * buf, unsigned char c, size_t size, int set)
+test_buf(char * buf, unsigned char c, size_t size, int set)
 {
+	unsigned char *ptr;
 	int step;
 
+	ptr = (unsigned char *)buf;
+
 	for (step = 1; size > 0; size--) {
 		if (set)
-			*buf++ = c;
-		else if (*buf++ != c)
+			*ptr++ = c;
+		else if (*ptr++ != c)
 			return -1;
 
 		c += step;

minix/tests/test88.c

@@ -68,7 +68,7 @@ static void *bad_ptr;
  * Drop user and group privileges in the child process if requested.
  */
 static void
-spawn(struct link * link, void (* proc)(), int drop)
+spawn(struct link * link, void (* proc)(struct link *), int drop)
 {
 	struct passwd *pw;
 	struct group *gr;
@@ -1592,7 +1592,7 @@ test88c_perm1(struct link * parent)
 		 */
 		memset(val, 0, sizeof(val));
 
-		for (i = 0; i < 4; i++) {
+		for (i = 0; i < 3; i++) {
 			switch (i) {
 			case 0:
 				cmd = GETALL;
@@ -1609,6 +1609,8 @@ test88c_perm1(struct link * parent)
 				ptr = &semds;
 				bit = 4;
 				break;
+			default:
+				abort();
 			}
 
 			r = semctl(id[0], 0, cmd, ptr);

minix/tests/test89.c

@@ -298,6 +298,9 @@ test_one_uid(int setnum, int sub)
 		sub89b(setnum);
 
 		return;
+
+	default:
+		abort();
 	}
 
 	if (res != 0 && (res != -1 || errno != EPERM)) e(setnum);
@@ -635,6 +638,9 @@ test_one_gid(int setnum, int sub)
 		sub89d(setnum);
 
 		return;
+
+	default:
+		abort();
 	}
 
 	if (res != 0 && (res != -1 || errno != EPERM)) e(setnum);