[flang-commits] [flang] [flang][NFC] Use LLVM's endianness enum (PR #86516)

[Peter Klausler via flang-commits]

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@@ -261,12 +262,10 @@ template <bool IS_SIGNED = false> class Int128 {
     }
   }
   static constexpr std::uint64_t topBit{std::uint64_t{1} << 63};
-#if FLANG_LITTLE_ENDIAN
-  std::uint64_t low_{0}, high_{0};
-#elif FLANG_BIG_ENDIAN
+#if defined(BYTE_ORDER) && defined(BIG_ENDIAN) && BYTE_ORDER == BIG_ENDIAN
   std::uint64_t high_{0}, low_{0};
 #else
-#error host endianness is not known
+  std::uint64_t low_{0}, high_{0};
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klausler wrote:

You're just defaulting to little-endianness here if `BYTE_ORDER` is undefined.  This can be worse than the current situation.

https://github.com/llvm/llvm-project/pull/86516