Replace config-time define HOST_WORDS_BIGENDIAN

Replace a config-time define with a compile time condition
define (compatible with clang and gcc) that must be declared prior to
its usage. This avoids having a global configure time define, but also
prevents from bad usage, if the config header wasn't included before.

This can help to make some code independent from qemu too.

gcc supports __BYTE_ORDER__ from about 4.6 and clang from 3.2.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
[ For the s390x parts I'm involved in ]
Acked-by: Halil Pasic <pasic@linux.ibm.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220323155743.1585078-7-marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/util.h b/net/util.h
index 358185f..2883129 100644
--- a/net/util.h
+++ b/net/util.h
@@ -30,7 +30,7 @@
  * Structure of an internet header, naked of options.
  */
 struct ip {
-#ifdef HOST_WORDS_BIGENDIAN
+#if HOST_BIG_ENDIAN
     uint8_t ip_v:4,         /* version */
             ip_hl:4;        /* header length */
 #else