Index: sbin/sysctl/Makefile
===================================================================
--- sbin/sysctl/Makefile
+++ sbin/sysctl/Makefile
@@ -4,7 +4,6 @@
 PACKAGE=runtime
 CONFS=	sysctl.conf
 PROG=	sysctl
-WARNS?=	3
 MAN=	sysctl.8
 
 .include <bsd.prog.mk>
Index: sbin/sysctl/sysctl.c
===================================================================
--- sbin/sysctl/sysctl.c
+++ sbin/sysctl/sysctl.c
@@ -735,7 +735,7 @@
 	}
 	efihdr = p;
 	efisz = (sizeof(struct efi_map_header) + 0xf) & ~0xf;
-	map = (struct efi_md *)((uint8_t *)efihdr + efisz);
+	map = (void *)((uint8_t *)efihdr + efisz);
 
 	if (efihdr->descriptor_size == 0)
 		return (0);
@@ -904,7 +904,7 @@
 		err(1, "sysctl fmt %d %zu %d", i, j, errno);
 
 	if (kind)
-		*kind = *(u_int *)buf;
+		memcpy(kind, buf, sizeof(*kind));
 
 	if (fmt)
 		strcpy(fmt, (char *)(buf + sizeof(u_int)));
@@ -921,7 +921,8 @@
 static int
 show_var(int *oid, int nlen)
 {
-	u_char buf[BUFSIZ], *val, *oval, *p;
+	u_char buf[BUFSIZ], *p;
+	void *val, *oval;
 	char name[BUFSIZ], fmt[BUFSIZ];
 	const char *sep, *sep1, *prntype;
 	int qoid[CTL_MAXNAME+2];
@@ -936,7 +937,8 @@
 	int prec;
 
 	/* Silence GCC. */
-	umv = mv = intlen = 0;
+	umv = mv = 0;
+	func = NULL;
 
 	bzero(buf, BUFSIZ);
 	bzero(fmt, BUFSIZ);
@@ -1043,8 +1045,8 @@
 		free(oval);
 		return (0);
 	}
-	val[len] = '\0';
 	p = val;
+	p[len] = '\0';
 	sign = ctl_sign[ctltype];
 	intlen = ctl_size[ctltype];
 
@@ -1076,33 +1078,33 @@
 			switch (kind & CTLTYPE) {
 			case CTLTYPE_INT:
 			case CTLTYPE_UINT:
-				umv = *(u_int *)p;
-				mv = *(int *)p;
+				umv = *(u_int *)val;
+				mv = *(int *)val;
 				break;
 			case CTLTYPE_LONG:
 			case CTLTYPE_ULONG:
-				umv = *(u_long *)p;
-				mv = *(long *)p;
+				umv = *(u_long *)val;
+				mv = *(long *)val;
 				break;
 			case CTLTYPE_S8:
 			case CTLTYPE_U8:
-				umv = *(uint8_t *)p;
-				mv = *(int8_t *)p;
+				umv = *(uint8_t *)val;
+				mv = *(int8_t *)val;
 				break;
 			case CTLTYPE_S16:
 			case CTLTYPE_U16:
-				umv = *(uint16_t *)p;
-				mv = *(int16_t *)p;
+				umv = *(uint16_t *)val;
+				mv = *(int16_t *)val;
 				break;
 			case CTLTYPE_S32:
 			case CTLTYPE_U32:
-				umv = *(uint32_t *)p;
-				mv = *(int32_t *)p;
+				umv = *(uint32_t *)val;
+				mv = *(int32_t *)val;
 				break;
 			case CTLTYPE_S64:
 			case CTLTYPE_U64:
-				umv = *(uint64_t *)p;
-				mv = *(int64_t *)p;
+				umv = *(uint64_t *)val;
+				mv = *(int64_t *)val;
 				break;
 			}
 			fputs(sep1, stdout);
@@ -1121,7 +1123,7 @@
 					if (fmt[2] != '\0')
 						prec = fmt[2] - '0';
 					base = 1.0;
-					for (int i = 0; i < prec; i++)
+					for (i = 0; i < prec; i++)
 						base *= 10.0;
 					printf("%.*fC", prec,
 					    (float)mv / base - 273.15);
@@ -1153,7 +1155,7 @@
 		if (!nflag)
 			printf("%s%s", name, sep);
 		printf("Format:%s Length:%zu Dump:0x", fmt, len);
-		while (len-- && (xflag || p < val + 16))
+		while (len-- && (xflag || p < (u_char *)val + 16))
 			printf("%02x", *p++);
 		if (!xflag && len > 16)
 			printf("...");
Index: sys/sys/efi.h
===================================================================
--- sys/sys/efi.h
+++ sys/sys/efi.h
@@ -93,7 +93,7 @@
 };
 
 #define efi_next_descriptor(ptr, size) \
-    ((struct efi_md *)(((uint8_t *)(ptr)) + (size)))
+    ((struct efi_md *)(void *)(((uint8_t *)(ptr)) + (size)))
 
 struct efi_tm {
 	uint16_t	tm_year;		/* 1998 - 20XX */