inet_network does not exist on Windows, so replace htonl(inet_network…

…(c)) with inet_addr(c). Verified that it gives the same result with the code,

int main(int argc, char** argv) {
  MPI_Init(&argc, &argv);
  char hostname[MPI_MAX_PROCESSOR_NAME];
  int len;
  MPI_Get_processor_name(hostname,&len);
  struct hostent * host = gethostbyname(hostname);
  int myaddr1 = (int) inet_addr(inet_ntoa(*(struct in_addr *)host->h_addr));
  int myaddr2 = (int) htonl(inet_network(inet_ntoa(*(struct in_addr *)host->h_addr)));
  std::cout << "myaddr1 = " << myaddr1 << std::endl;
  std::cout << "myaddr2 = " << myaddr2 << std::endl;
  MPI_Finalize();
}

Compiled with

  mpicxx testinet.cxx -o testinet

Output was

cary@kara/.../~$ mpiexec -np 1 testinet
myaddr1 = -285103936
myaddr2 = -285103936

packages/muelu/src/Utils/MueLu_Utilities.cpp

@@ -54,9 +54,13 @@
 
 #ifdef HAVE_MPI
 #include <mpi.h>
+#ifdef _WIN32
+#include <winsock2.h>
+#else
 #include <netdb.h>
 #include <arpa/inet.h>
 #endif
+#endif
 
 
 
@@ -265,7 +269,7 @@ bool IsParamValidVariable(const std::string& name)
        int len;
        MPI_Get_processor_name(hostname,&len);
        struct hostent * host = gethostbyname(hostname);
-       int myaddr = (int) htonl(inet_network(inet_ntoa(*(struct in_addr *)host->h_addr)));
+       int myaddr = (int) inet_addr(inet_ntoa(*(struct in_addr *)host->h_addr));
 
        // All-to-all exchange of address integers
        std::vector<int> addressList(numRanks);