Improve and simplify endiannes detection

config.h.in

@@ -126,33 +126,43 @@
 #cmakedefine WITH_SYSTEM_HIREDIS 1
 
 /* Detect endiannes */
- #ifdef HAVE_ENDIAN_H
+
+#ifdef HAVE_ENDIAN_H
  #include <endian.h>
- #else
- #ifdef HAVE_SYS_ENDIAN_H
+#elif defined(HAVE_SYS_ENDIAN_H)
  #include <sys/endian.h>
- #else
- #ifdef HAVE_MACHINE_ENDIAN_H
+#elif defined(HAVE_MACHINE_ENDIAN_H)
  #include <machine/endian.h>
- #else
+#endif
+
+#ifndef BYTE_ORDER
+
+#ifndef LITTLE_ENDIAN
  #define LITTLE_ENDIAN   1234
+#endif
+#ifndef BIG_ENDIAN
  #define BIG_ENDIAN      4321
- #if defined(i386) || defined(__i386) || defined(__amd64) || \
- 	 defined(BIT_ZERO_ON_RIGHT) || defined(__x86__)
- #define BYTE_ORDER      LITTLE_ENDIAN
- #endif
-
- #if defined(__sparc) || defined(__sparc__) || defined(__powerpc__)
- #define BYTE_ORDER      BIG_ENDIAN
- #endif
+#endif
 
- #endif /* HAVE_MACHINE_ENDIAN_H */
- #endif /* HAVE_SYS_ENDIAN_H */
- #endif /* HAVE_ENDIAN_H */
+#if defined(__BYTE_ORDER) && __BYTE_ORDER == __BIG_ENDIAN || \
+    defined(__BIG_ENDIAN__) || \
+    defined(__ARMEB__) || \
+    defined(__THUMBEB__) || \
+    defined(__AARCH64EB__) || \
+    defined(_MIBSEB) || defined(__MIBSEB) || defined(__MIBSEB__)
+#define BYTE_ORDER BIG_ENDIAN
+#elif defined(__BYTE_ORDER) && __BYTE_ORDER == __LITTLE_ENDIAN || \
+    defined(__LITTLE_ENDIAN__) || \
+    defined(__ARMEL__) || \
+    defined(__THUMBEL__) || \
+    defined(__AARCH64EL__) || \
+    defined(_MIPSEL) || defined(__MIPSEL) || defined(__MIPSEL__)
+#define BYTE_ORDER LITTLE_ENDIAN
+#else
+#error "I don't know what architecture this is!"
+#endif
 
- #if !defined(BYTE_ORDER)
- # error "Undefined or unknown BYTE_ORDER"
- #endif
+#endif /* BYTE_ORDER */
 
 /* Configure allocator */
 #define uthash_malloc(sz) g_slice_alloc(sz)
@@ -227,6 +237,10 @@
 #include <string.h>
 #endif
 
+#ifdef HAVE_STRINGS_H
+#include <strings.h>
+#endif
+
 #include <errno.h>
 
 #include <glib.h>