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
namespace llvm {
namespace sys {
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;
static const bool IsBigEndianHost = true;
#else
static const bool IsBigEndianHost = false;