[libc-commits] [libc] [libc] Some more MSVC compatibility in src/__support. (PR #158108)

[via libc-commits]

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@@ -16,10 +16,32 @@
 namespace LIBC_NAMESPACE_DECL {
 
 // We rely on compiler preprocessor defines to allow for cross compilation.
+#ifdef LIBC_COMPILER_IS_MSVC
+#define __BYTE_ORDER__ 0
+#define __ORDER_LITTLE_ENDIAN__ 0
+#define __ORDER_BIG_ENDIAN__ 1
+
+LIBC_INLINE static uint16_t __builtin_bswap16(uint16_t v) {
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lntue wrote:

refactored it to a generic `byte_swap` utility function.

https://github.com/llvm/llvm-project/pull/158108