build: fix failures with -Wcast-align and -Werror

Closes #457

1 files changed, 7 insertions, 5 deletions

diff --git a/lib/if2ip.c b/lib/if2ip.c
index 6e6f9692e..0e2d71dbe 100644
--- a/lib/if2ip.c
+++ b/lib/if2ip.c
@@ -68,7 +68,7 @@ unsigned int Curl_ipv6_scope(const struct sockaddr *sa)
   (void) sa;
 #else
   if(sa->sa_family == AF_INET6) {
-    const struct sockaddr_in6 * sa6 = (const struct sockaddr_in6 *) sa;
+    const struct sockaddr_in6 * sa6 = (const struct sockaddr_in6 *)(void *) sa;
     const unsigned char * b = sa6->sin6_addr.s6_addr;
     unsigned short w = (unsigned short) ((b[0] << 8) | b[1]);
 
@@ -152,11 +152,12 @@ if2ip_result_t Curl_if2ip(int af, unsigned int remote_scope,
                 continue;
               }
 
-              addr = &((struct sockaddr_in6 *)iface->ifa_addr)->sin6_addr;
+              addr =
+                &((struct sockaddr_in6 *)(void *)iface->ifa_addr)->sin6_addr;
 #ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID
               /* Include the scope of this interface as part of the address */
-              scopeid =
-                ((struct sockaddr_in6 *)iface->ifa_addr)->sin6_scope_id;
+              scopeid = ((struct sockaddr_in6 *)(void *)iface->ifa_addr)
+                            ->sin6_scope_id;
 
               /* If given, scope id should match. */
               if(remote_scope_id && scopeid != remote_scope_id) {
@@ -171,7 +172,8 @@ if2ip_result_t Curl_if2ip(int af, unsigned int remote_scope,
             }
             else
 #endif
-              addr = &((struct sockaddr_in *)iface->ifa_addr)->sin_addr;
+              addr =
+                  &((struct sockaddr_in *)(void *)iface->ifa_addr)->sin_addr;
             res = IF2IP_FOUND;
             ip = (char *) Curl_inet_ntop(af, addr, ipstr, sizeof(ipstr));
             snprintf(buf, buf_size, "%s%s", ip, scope);