Fix endianness on some MSVC versions.

Looks like it was evaluating undef == undef to true.

llvm-svn: 179549

diff --git a/llvm/include/llvm/Support/Host.h b/llvm/include/llvm/Support/Host.h
index 103a7eb..cba6092 100644 (file)
--- a/llvm/include/llvm/Support/Host.h
+++ b/llvm/include/llvm/Support/Host.h
@@ -29,7 +29,7 @@
 namespace llvm {
 namespace sys {
 
-#if BYTE_ORDER == BIG_ENDIAN
+#if defined(BYTBYTE_ORDER) && defined(BIG_ENDIAN) && BYTE_ORDER == BIG_ENDIAN
   static const bool IsBigEndianHost = true;
 #else
   static const bool IsBigEndianHost = false;