opal/datatype: fix opal_dt_swap_long_double if no IEEE754_H

Signed-off-by: Gilles Gouaillardet <gilles@rist.or.jp>

configure.ac

@@ -588,7 +588,7 @@ AC_CACHE_SAVE
 opal_show_title "Header file tests"
 
 AC_CHECK_HEADERS([alloca.h aio.h arpa/inet.h dirent.h \
-    dlfcn.h endian.h execinfo.h err.h fcntl.h grp.h ieee754 libgen.h \
+    dlfcn.h endian.h execinfo.h err.h fcntl.h grp.h libgen.h \
     libutil.h memory.h netdb.h netinet/in.h netinet/tcp.h \
     poll.h pthread.h pty.h pwd.h sched.h \
     strings.h stropts.h linux/ethtool.h linux/sockios.h \
@@ -599,7 +599,7 @@ AC_CHECK_HEADERS([alloca.h aio.h arpa/inet.h dirent.h \
     sys/types.h sys/uio.h sys/un.h net/uio.h sys/utsname.h sys/vfs.h sys/wait.h syslog.h \
     termios.h ulimit.h unistd.h util.h utmp.h malloc.h \
     ifaddrs.h crt_externs.h regex.h mntent.h paths.h \
-    ioLib.h sockLib.h hostLib.h shlwapi.h sys/synch.h db.h ndbm.h zlib.h])
+    ioLib.h sockLib.h hostLib.h shlwapi.h sys/synch.h db.h ndbm.h zlib.h ieee754.h])
 
 AC_CHECK_HEADERS([sys/mount.h], [], [],
 [AC_INCLUDES_DEFAULT

opal/datatype/opal_copy_functions_heterogeneous.c

@@ -89,6 +89,7 @@ struct bit80 {
 static inline void
 opal_dt_swap_long_double(void *to_p, const void *from_p, const size_t size, size_t count, uint32_t remoteArch)
 {
+#ifdef HAVE_IEEE754_H
     size_t i;
     long double*to = (long double *) to_p;
 
@@ -120,6 +121,9 @@ opal_dt_swap_long_double(void *to_p, const void *from_p, const size_t size, size
         }
 #endif
     }
+#else
+    assert(0);
+#endif
 }
 #else
 #define opal_dt_swap_long_double(to_p, from_p, size, count, remoteArch)