Fix endianness on some MSVC versions.

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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179549 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/Support/Host.h b/include/llvm/Support/Host.h
index 103a7eb0367662e21c46811a3329befcb3cbbc14..cba609289086d57990f64a4ede72a15979338ceb 100644 (file)
--- a/include/llvm/Support/Host.h
+++ b/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;