re PR other/85161 (Test case failures in libbacktrace on powerpc64 BE starting with r253456)

	PR other/85161
	* elf.c (elf_zlib_fetch): Fix up predefined macro names in test for
	big endian, only use 32-bit loads if endianity macros are predefined
	and indicate big or little endian.

From-SVN: r259096

libbacktrace/ChangeLog

+2018-04-04  Jakub Jelinek  <jakub@redhat.com>
+
+	PR other/85161
+	* elf.c (elf_zlib_fetch): Fix up predefined macro names in test for
+	big endian, only use 32-bit loads if endianity macros are predefined
+	and indicate big or little endian.
+
 2018-02-14  Igor Tsimbalist  <igor.v.tsimbalist@intel.com>
 
 	PR target/84148

libbacktrace/elf.c

@@ -1086,12 +1086,19 @@ elf_zlib_fetch (const unsigned char **ppin, const unsigned char *pinend,
       return 0;
     }
 
+#if defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) \
+    && defined(__ORDER_BIG_ENDIAN__) \
+    && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ \
+        || __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
   /* We've ensured that PIN is aligned.  */
   next = *(const uint32_t *)pin;
 
-#if __BYTE_ORDER == __ORDER_BIG_ENDIAN
+#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
   next = __builtin_bswap32 (next);
 #endif
+#else
+  next = pin[0] | (pin[1] << 8) | (pin[2] << 16) | (pin[3] << 24);
+#endif
 
   val |= (uint64_t)next << bits;
   bits += 32;