Fix -Wvoid-pointer-to-enum-cast warnings.

This pattern is used in callbacks with void * data arguments and seems
both relatively uncommon and relatively harmless.  Silence the warning
by casting through uintptr_t.

This warning is on by default in Clang 11.

Reviewed by:	arichardson
Obtained from:	CheriBSD (partial)
MFC after:	1 week
Sponsored by:	DARPA
Differential Revision:	https://reviews.freebsd.org/D24425

4 files changed, 18 insertions, 18 deletions

diff --git a/lib/libc/net/gethostnamadr.c b/lib/libc/net/gethostnamadr.c
index b0e68cf3431c..718a64defab9 100644
--- a/lib/libc/net/gethostnamadr.c
+++ b/lib/libc/net/gethostnamadr.c
@@ -177,7 +177,7 @@ host_id_func(char *buffer, size_t *buffer_size, va_list ap, void *cache_mdata)
 	res_options = statp->options & (RES_RECURSE | RES_DEFNAMES |
 	    RES_DNSRCH | RES_NOALIASES | RES_USE_INET6);
 
-	lookup_type = (enum nss_lookup_type)cache_mdata;
+	lookup_type = (enum nss_lookup_type)(uintptr_t)cache_mdata;
 	switch (lookup_type) {
 	case nss_lt_name:
 		str = va_arg(ap, char *);
@@ -268,7 +268,7 @@ host_marshal_func(char *buffer, size_t *buffer_size, void *retval, va_list ap,
 	size_t desired_size, aliases_size, addr_size, size;
 	char *p, **iter;
 
-	switch ((enum nss_lookup_type)cache_mdata) {
+	switch ((enum nss_lookup_type)(uintptr_t)cache_mdata) {
 	case nss_lt_name:
 		str = va_arg(ap, char *);
 		type = va_arg(ap, int);
@@ -375,7 +375,7 @@ host_unmarshal_func(char *buffer, size_t buffer_size, void *retval, va_list ap,
 	char *orig_buf;
 	size_t orig_buf_size;
 
-	switch ((enum nss_lookup_type)cache_mdata) {
+	switch ((enum nss_lookup_type)(uintptr_t)cache_mdata) {
 	case nss_lt_name:
 		str = va_arg(ap, char *);
 		type = va_arg(ap, int);
diff --git a/lib/libc/net/getnetnamadr.c b/lib/libc/net/getnetnamadr.c
index 77773992123f..2d9776685cf9 100644
--- a/lib/libc/net/getnetnamadr.c
+++ b/lib/libc/net/getnetnamadr.c
@@ -70,7 +70,7 @@ net_id_func(char *buffer, size_t *buffer_size, va_list ap, void *cache_mdata)
 	enum nss_lookup_type lookup_type;
 	int res = NS_UNAVAIL;
 
-	lookup_type = (enum nss_lookup_type)cache_mdata;
+	lookup_type = (enum nss_lookup_type)(uintptr_t)cache_mdata;
 	switch (lookup_type) {
 	case nss_lt_name:
 		name = va_arg(ap, char *);
@@ -133,7 +133,7 @@ net_marshal_func(char *buffer, size_t *buffer_size, void *retval, va_list ap,
 	char *p;
 	char **alias;
 
-	switch ((enum nss_lookup_type)cache_mdata) {
+	switch ((enum nss_lookup_type)(uintptr_t)cache_mdata) {
 	case nss_lt_name:
 		name = va_arg(ap, char *);
 		break;
@@ -221,7 +221,7 @@ net_unmarshal_func(char *buffer, size_t buffer_size, void *retval, va_list ap,
 	char *p;
 	char **alias;
 
-	switch ((enum nss_lookup_type)cache_mdata) {
+	switch ((enum nss_lookup_type)(uintptr_t)cache_mdata) {
 	case nss_lt_name:
 		name = va_arg(ap, char *);
 		break;
diff --git a/lib/libc/net/getprotoent.c b/lib/libc/net/getprotoent.c
index cde22564b995..73b069250499 100644
--- a/lib/libc/net/getprotoent.c
+++ b/lib/libc/net/getprotoent.c
@@ -97,7 +97,7 @@ __proto_id_func(char *buffer, size_t *buffer_size, va_list ap,
 	enum nss_lookup_type lookup_type;
 	int res = NS_UNAVAIL;
 
-	lookup_type = (enum nss_lookup_type)cache_mdata;
+	lookup_type = (enum nss_lookup_type)(uintptr_t)cache_mdata;
 	switch (lookup_type) {
 	case nss_lt_name:
 		name = va_arg(ap, char *);
@@ -155,7 +155,7 @@ __proto_marshal_func(char *buffer, size_t *buffer_size, void *retval,
 	char *p;
 	char **alias;
 
-	switch ((enum nss_lookup_type)cache_mdata) {
+	switch ((enum nss_lookup_type)(uintptr_t)cache_mdata) {
 	case nss_lt_name:
 		name = va_arg(ap, char *);
 		break;
@@ -241,7 +241,7 @@ __proto_unmarshal_func(char *buffer, size_t buffer_size, void *retval,
 	char *p;
 	char **alias;
 
-	switch ((enum nss_lookup_type)cache_mdata) {
+	switch ((enum nss_lookup_type)(uintptr_t)cache_mdata) {
 	case nss_lt_name:
 		name = va_arg(ap, char *);
 		break;
diff --git a/lib/libc/net/getservent.c b/lib/libc/net/getservent.c
index 2e4f47bef664..76db40d96cf5 100644
--- a/lib/libc/net/getservent.c
+++ b/lib/libc/net/getservent.c
@@ -446,7 +446,7 @@ files_setservent(void *retval, void *mdata, va_list ap)
 	if (rv != 0)
 		return (NS_UNAVAIL);
 
-	switch ((enum constants)mdata) {
+	switch ((enum constants)(uintptr_t)mdata) {
 	case SETSERVENT:
 		f = va_arg(ap,int);
 		if (st->fp == NULL)
@@ -509,7 +509,7 @@ db_servent(void *retval, void *mdata, va_list ap)
 
 	name = NULL;
 	proto = NULL;
-	how = (enum nss_lookup_type)mdata;
+	how = (enum nss_lookup_type)(uintptr_t)mdata;
 	switch (how) {
 	case nss_lt_name:
 		name = va_arg(ap, char *);
@@ -626,7 +626,7 @@ db_setservent(void *retval, void *mdata, va_list ap)
 	if (rv != 0)
 		return (NS_UNAVAIL);
 
-	switch ((enum constants)mdata) {
+	switch ((enum constants)(uintptr_t)mdata) {
 	case SETSERVENT:
 		f = va_arg(ap, int);
 		st->stayopen |= f;
@@ -682,7 +682,7 @@ nis_servent(void *retval, void *mdata, va_list ap)
 	name = NULL;
 	proto = NULL;
 	buf = NULL;
-	how = (enum nss_lookup_type)mdata;
+	how = (enum nss_lookup_type)(uintptr_t)mdata;
 	switch (how) {
 	case nss_lt_name:
 		name = va_arg(ap, char *);
@@ -814,7 +814,7 @@ nis_setservent(void *result, void *mdata, va_list ap)
 	if (rv != 0)
 		return (NS_UNAVAIL);
 
-	switch ((enum constants)mdata) {
+	switch ((enum constants)(uintptr_t)mdata) {
 	case SETSERVENT:
 	case ENDSERVENT:
 		free(st->yp_key);
@@ -850,7 +850,7 @@ compat_setservent(void *retval, void *mdata, va_list ap)
 
 	(void)files_setservent(retval, mdata, ap);
 
-	switch ((enum constants)mdata) {
+	switch ((enum constants)(uintptr_t)mdata) {
 	case SETSERVENT:
 		f = va_arg(ap,int);
 		(void)nsdispatch(retval, compat_dtab, NSDB_SERVICES_COMPAT,
@@ -879,7 +879,7 @@ serv_id_func(char *buffer, size_t *buffer_size, va_list ap, void *cache_mdata)
 	enum nss_lookup_type lookup_type;
 	int res = NS_UNAVAIL;
 
-	lookup_type = (enum nss_lookup_type)cache_mdata;
+	lookup_type = (enum nss_lookup_type)(uintptr_t)cache_mdata;
 	switch (lookup_type) {
 	case nss_lt_name:
 		name = va_arg(ap, char *);
@@ -961,7 +961,7 @@ serv_marshal_func(char *buffer, size_t *buffer_size, void *retval, va_list ap,
 	size_t size;
 	size_t aliases_size;
 
-	switch ((enum nss_lookup_type)cache_mdata) {
+	switch ((enum nss_lookup_type)(uintptr_t)cache_mdata) {
 	case nss_lt_name:
 		name = va_arg(ap, char *);
 		proto = va_arg(ap, char *);
@@ -1058,7 +1058,7 @@ serv_unmarshal_func(char *buffer, size_t buffer_size, void *retval, va_list ap,
 	size_t orig_buf_size;
 	int *ret_errno;
 
-	switch ((enum nss_lookup_type)cache_mdata) {
+	switch ((enum nss_lookup_type)(uintptr_t)cache_mdata) {
 	case nss_lt_name:
 		name = va_arg(ap, char *);
 		proto = va_arg(ap, char *);