Fix defines for older gcc

src/base_core.h

@@ -6,6 +6,15 @@
 #include <stdint.h>
 #include <string.h>
 
+#ifdef __has_feature
+    #if __has_feature(address_sanitizer)
+    #define USE_ASAN 1
+    #endif
+#endif
+#if defined(__SANITIZE_ADDRESS__)
+    #define USE_ASAN 1
+#endif
+
 // Types
 typedef int8_t      S8;
 typedef int16_t     S16;
@@ -189,7 +198,7 @@ typedef unsigned __int128 U128;
 
 // memory
 #define MemSet(ptr, val, len)       memset(ptr, val, len)
-#if __has_feature(address_sanitizer) || defined(__SANITIZE_ADDRESS__)
+#ifdef USE_ASAN
 #define MemoryZero(ptr, len)        memset(ptr, 0, len)
 // explicity bzero is usually not being intercepted
 #else
@@ -293,8 +302,7 @@ static INLINE U64 SaturatingMult64(U64 a, U64 b)
 }
 
 // address-sanitizer helpers (-fsanitize=address)
-
-#if __has_feature(address_sanitizer) || defined(__SANITIZE_ADDRESS__)
+#ifdef USE_ASAN
 #include <sanitizer/asan_interface.h>
 #define ASAN_POISON_MEMORY_REGION(addr, size) \
   __asan_poison_memory_region((addr), (size))