slirp: Avoid statements without effect on Big Endian host

Darwin has HTON*/NTOH* macros that on BE simply return the argument.
This is incompatible with SLIRP's use of these macros as a statement.

Undefine the macros in the HOST_WORDS_BIGENDIAN code path to redefine
these macros as no-op, as already done when they were undefined.

Suggested-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Andreas Färber <andreas.faerber@web.de>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

1 files changed, 4 insertions, 8 deletions

diff --git a/ip.h b/ip.h
index c82b521..1680791 100644
--- a/ip.h
+++ b/ip.h
@@ -34,18 +34,14 @@
 #define _IP_H_
 
 #ifdef HOST_WORDS_BIGENDIAN
-#ifndef NTOHL
+#undef NTOHL
+#undef NTOHS
+#undef HTONL
+#undef HTONS
 #define NTOHL(d)
-#endif
-#ifndef NTOHS
 #define NTOHS(d)
-#endif
-#ifndef HTONL
 #define HTONL(d)
-#endif
-#ifndef HTONS
 #define HTONS(d)
-#endif
 #else
 #ifndef NTOHL
 #define NTOHL(d) ((d) = ntohl((d)))