io/romio: fix filesystem type check on OpenBSD 5.7

check the existence of the f_type field in struct statfs

Thanks Paul Hargrove for the report

ompi/mca/io/romio314/romio/adio/common/ad_fstype.c

@@ -346,6 +346,8 @@ static void ADIO_FileSysType_fncall(const char *filename, int *fstype, int *erro
 # endif
 
 
+# ifdef ROMIO_HAVE_STRUCT_STATFS_WITH_F_TYPE
+
 #ifdef ROMIO_GPFS
     if (fsbuf.f_type == GPFS_SUPER_MAGIC) {
 	*fstype = ADIO_GPFS;
@@ -413,6 +415,8 @@ static void ADIO_FileSysType_fncall(const char *filename, int *fstype, int *erro
     }
 # endif
 
+# endif /*ROMIO_HAVE_STRUCT_STATFS_WITH_F_TYPE */
+
 # ifdef ROMIO_UFS
     /* if UFS support is enabled, default to that */
     *fstype = ADIO_UFS;

ompi/mca/io/romio314/romio/configure.ac

@@ -1360,11 +1360,53 @@ if test "$pac_cv_have_statfs" = yes ; then
     AC_DEFINE(HAVE_STRUCT_STATFS,1,[Define if struct statfs can be compiled])
 fi
 
+AC_MSG_CHECKING([for f_type member of statfs structure])
+AC_TRY_COMPILE([
+#ifdef HAVE_SYS_VFS_H
+#include <sys/vfs.h>
+#endif
+#ifdef HAVE_SYS_STATVFS_H
+#include <sys/statvfs.h>
+#endif
+#ifdef HAVE_SYS_PARAM_H
+#include <sys/param.h>
+#endif
+#ifdef HAVE_SYS_MOUNT_H
+#include <sys/mount.h>
+#endif
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
+    ],[
+    struct statfs f;
+    memset(&f, 0, sizeof(f));
+    f.f_type = 0;
+    ],
+    pac_cv_have_statfs_f_type=yes,
+    pac_cv_have_statfs_f_type=no
+)
+AC_MSG_RESULT($pac_cv_have_statfs_f_type)
+if test $pac_cv_have_statfs_f_type = yes ; then
+    AC_DEFINE(ROMIO_HAVE_STRUCT_STATFS_WITH_F_TYPE, 1,[Define if statfs has f_type])
+fi
+
 AC_MSG_CHECKING([for f_fstypename member of statfs structure])
 AC_TRY_COMPILE([
+#ifdef HAVE_SYS_VFS_H
+#include <sys/vfs.h>
+#endif
+#ifdef HAVE_SYS_STATVFS_H
+#include <sys/statvfs.h>
+#endif
+#ifdef HAVE_SYS_PARAM_H
 #include <sys/param.h>
+#endif
+#ifdef HAVE_SYS_MOUNT_H
 #include <sys/mount.h>
+#endif
+#ifdef HAVE_STRING_H
 #include <string.h>
+#endif
     ],[
     struct statfs f;
     memset(&f, 0, sizeof(f));