cmake可见性和AppArmor示例

cmake/visibility/timeutil/timeutil.cpp

@@ -0,0 +1,9 @@
+#include "timeutil.h"
+#include <ctime>
+
+std::string timestamp(const char* fmt) {
+    char buf[32];
+    std::time_t t = std::time(nullptr);
+    std::strftime(buf, sizeof(buf), fmt, std::localtime(&t));
+    return buf;
+}