Add checks to determine if built-in byte swap functions exist

Quphoria · Apr 5, 2024 · 93ef9cb · 93ef9cb
1 parent 3a148bd
commit 93ef9cb
Showing 1 changed file with 10 additions and 0 deletions.
diff --git a/src/arch/cc.h b/src/arch/cc.h
@@ -42,9 +42,19 @@ void qnethernet_hal_stdio_flush(int file);
   alignas(MEM_ALIGNMENT) u8_t variable_name[(size)]
 #endif  // !QNETHERNET_LWIP_MEMORY_IN_RAM1
 
+// Byte swapping
 #if (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
+#if defined(__has_builtin)
+
+#if __has_builtin(__builtin_bswap16)
 #define lwip_htons(x) __builtin_bswap16(x)
+#endif  // __has_builtin(__builtin_bswap16)
+
+#if __has_builtin(__builtin_bswap32)
 #define lwip_htonl(x) __builtin_bswap32(x)
+#endif  // __has_builtin(__builtin_bswap32)
+
+#endif  // defined(__has_builtin)
 #endif  // __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
 
 #ifdef __cplusplus