Fix compiler errors on Solaris, NetBSD, and OpenBSD:

* Per
   http://www.open-mpi.org/community/lists/devel/2013/12/13504.php, 
   protect usage of struct ifreq->ifr_hwaddr
 * Per
   http://www.open-mpi.org/community/lists/devel/2013/12/13503.php,
   avoid #define conflict with the token "if_mtu"
 * Also fix some whitespace and string naming issues in opal/util/if.c

Tested by Paul Hargrove.

Refs trac:4010

This commit was SVN r30006.

The following Trac tickets were found above:
  Ticket 4010 --> https://svn.open-mpi.org/trac/ompi/ticket/4010

opal/mca/if/base/if_base_components.c

@@ -86,5 +86,5 @@ static void opal_if_construct(opal_if_t *obj)
     obj->if_mask = 0;
     obj->if_bandwidth = 0;
     memset(obj->if_mac, 0, sizeof(obj->if_mac));
-    obj->if_mtu = 0;
+    obj->ifmtu = 0;
 }

opal/mca/if/if.h

@@ -95,7 +95,8 @@ typedef struct opal_if_t {
     uint32_t            if_mask;
     uint32_t            if_bandwidth;
     uint8_t             if_mac[6];
-    int                 if_mtu;
+    int                 ifmtu; /* Can't use if_mtu because of a
+                                  #define collision on some BSDs */
 } opal_if_t;
 OPAL_DECLSPEC OBJ_CLASS_DECLARATION(opal_if_t);
 

opal/mca/if/posix_ipv4/configure.m4

@@ -42,7 +42,9 @@ AC_DEFUN([MCA_opal_if_posix_ipv4_CONFIG], [
          )
 
     AS_IF([test "$opal_if_posix_ipv4_happy" = "yes"],
-          [AC_CHECK_MEMBERS([struct ifreq.ifr_mtu], [], [],
+          [AC_CHECK_MEMBERS([struct ifreq.ifr_hwaddr], [], [],
+                           [[#include <net/if.h>]])
+           AC_CHECK_MEMBERS([struct ifreq.ifr_mtu], [], [],
                            [[#include <net/if.h>]])
           ])
 

opal/mca/if/posix_ipv4/if_posix.c

@@ -263,22 +263,22 @@ static int if_posix_open(void)
         /* generate CIDR and assign to netmask */
         intf->if_mask = prefix(((struct sockaddr_in*) &ifr->ifr_addr)->sin_addr.s_addr);
             
-#ifdef SIOCGIFHWADDR
-            /* get the MAC address */
-            if (ioctl(sd, SIOCGIFHWADDR, ifr) < 0) {
-                opal_output(0, "btl_usnic_opal_ifinit: ioctl(SIOCGIFHWADDR) failed with errno=%d", errno);
-                break;
-            }
-            memcpy(intf->if_mac, ifr->ifr_hwaddr.sa_data, 6);
+#if defined(SIOCGIFHWADDR) && defined(HAVE_STRUCT_IFREQ_IFR_HWADDR)
+        /* get the MAC address */
+        if (ioctl(sd, SIOCGIFHWADDR, ifr) < 0) {
+            opal_output(0, "opal_ifinit: ioctl(SIOCGIFHWADDR) failed with errno=%d", errno);
+            break;
+        }
+        memcpy(intf->if_mac, ifr->ifr_hwaddr.sa_data, 6);
 #endif
 
 #if defined(SIOCGIFMTU) && defined(HAVE_STRUCT_IFREQ_IFR_MTU)
-            /* get the MTU */
-            if (ioctl(sd, SIOCGIFMTU, ifr) < 0) {
-                opal_output(0, "btl_usnic_opal_ifinit: ioctl(SIOCGIFMTU) failed with errno=%d", errno);
-                break;
-            }
-            intf->if_mtu = ifr->ifr_mtu;
+        /* get the MTU */
+        if (ioctl(sd, SIOCGIFMTU, ifr) < 0) {
+            opal_output(0, "opal_ifinit: ioctl(SIOCGIFMTU) failed with errno=%d", errno);
+            break;
+        }
+        intf->ifmtu = ifr->ifr_mtu;
 #endif
 
         opal_list_append(&opal_if_list, &(intf->super));

opal/util/if.c

@@ -479,7 +479,7 @@ int opal_ifindextomac(int if_index, uint8_t mac[6])
  *  MTU assigned to the interface.
  */
 
-int opal_ifindextomtu(int if_index, int *if_mtu)
+int opal_ifindextomtu(int if_index, int *mtu)
 {
     opal_if_t* intf;
 
@@ -487,7 +487,7 @@ int opal_ifindextomtu(int if_index, int *if_mtu)
         intf != (opal_if_t*)opal_list_get_end(&opal_if_list);
         intf = (opal_if_t*)opal_list_get_next(intf)) {
         if (intf->if_index == if_index) {
-            *if_mtu = intf->if_mtu;
+            *mtu = intf->ifmtu;
             return OPAL_SUCCESS;
         }
     }

opal/util/if.h

@@ -179,7 +179,7 @@ OPAL_DECLSPEC int opal_ifindextomac(int if_index, uint8_t if_mac[6]);
  *  @param if_index (IN)  Interface index
  *  @param if_mtu (OUT)   Interface's MTU
  */
-OPAL_DECLSPEC int opal_ifindextomtu(int if_index, int *if_mtu);
+OPAL_DECLSPEC int opal_ifindextomtu(int if_index, int *mtu);
 
 /**
  *  Lookup an interface by index and return its flags.