libhfuzz: better comments for _HF_USE_RET_ADDR
int hfuzz_module_memorycmp = 0;
#if !defined(_HF_USE_RET_ADDR)
+/* Use just single ret-address */
#define RET_CALL_CHAIN (uintptr_t) __builtin_return_address(0)
#elif _HF_USE_RET_ADDR == 2
-/* Use mix of two previous addresses */
+/* Use mix of two previous return addresses - unsafe */
#define RET_CALL_CHAIN \
((uintptr_t)__builtin_return_address(0)) ^ ((uintptr_t)__builtin_return_address(1) << 12)
#elif _HF_USE_RET_ADDR == 3
-/* Use mix of three previous addresses */
+/* Use mix of three previous returen addresses - unsafe */
#define RET_CALL_CHAIN \
((uintptr_t)__builtin_return_address(0)) ^ ((uintptr_t)__builtin_return_address(1) << 8) ^ \
((uintptr_t)__builtin_return_address(1) << 16)
#else
-#error "Unknown value of _HF_USE_RET_ADDR" ## _HF_USE_RET_ADDR
+#error "Unknown value of _HF_USE_RET_ADDR"
#endif /* !defined(_HF_USE_RET_ADDR_1) */
static inline int _strcmp(const char* s1, const char* s2, uintptr_t addr) {
