diff --git a/lib/bt-log.c b/lib/bt-log.c
index bff9a794..aaa47ee5 100644
--- a/lib/bt-log.c
+++ b/lib/bt-log.c
@@ -39,7 +39,7 @@ DLL_EXPORT int tcc_backtrace(const char *fmt, ...)
         va_start(ap, fmt);
         ret = vfprintf(stderr, fmt, ap);
         va_end(ap);
-        fprintf(stderr, nl), fflush(stderr);
+        fprintf(stderr, "%s", nl), fflush(stderr);
     }
     return ret;
 }
diff --git a/tests/tcctest.c b/tests/tcctest.c
index bcf15bcf..b81cf5a7 100644
--- a/tests/tcctest.c
+++ b/tests/tcctest.c
@@ -341,7 +341,7 @@ static struct recursive_macro { int rm_field; } G;
     WRAP((printf("rm_field = %d %d\n", rm_field, WRAP(rm_field))));
 }
 
-#if !defined(__TINYC__) && (__GNUC__ >= 14)
+#if !defined(__TINYC__) && (__GNUC__ >= 14 || __clang_major__ >= 15)
 #define IMPLICIT_INT	int
 #else
 #define IMPLICIT_INT