Workaround the stringop-overflow check false positives.

test/src/test.c

@@ -232,3 +232,16 @@ p_test_fail(const char *prefix, const char *message) {
 	malloc_cprintf(NULL, NULL, "%s%s\n", prefix, message);
 	test_status = test_status_fail;
 }
+
+void
+strncpy_cond(void *dst, const char *src, bool cond) {
+	if (cond) {
+		/*
+		 * Avoid strcpy and explicitly set length to 0 because the
+		 * `stringop-overflow` check may warn even if the specific test
+		 * is unreachable.
+		 */
+		size_t n = cond ? strlen(src) + 1 : 0;
+		strncpy(dst, src, n);
+	}
+}