fix file cmake

std_msgs/CMakeLists.txt

@@ -3,12 +3,32 @@ project(std_msgs)
 
 set(CMAKE_CXX_STANDARD 17)
 
-if (NOT TARGET robot_time)
-    # add_subdirectory(${CMAKE_SOURCE_DIR}/../robot_time ${CMAKE_BINARY_DIR}/robot_time_build)
-    add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/../../robot_time ${CMAKE_BINARY_DIR}/robot_time_build)
-endif()
-
 add_library(std_msgs INTERFACE)
-target_include_directories(std_msgs INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}/include 
-                        ${CMAKE_SOURCE_DIR}/../robot_time/include)
+
+target_include_directories(std_msgs
+    INTERFACE
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+        $<INSTALL_INTERFACE:include>
+)
+
 target_link_libraries(std_msgs INTERFACE robot_time)
+
+# --- Cài đặt thư viện vào hệ thống khi chạy make install ---
+install(TARGETS std_msgs
+  EXPORT std_msgs-targets
+  ARCHIVE DESTINATION lib      # Thư viện tĩnh .a
+  LIBRARY DESTINATION lib      # Thư viện động .so
+  RUNTIME DESTINATION bin      # File thực thi (nếu có)
+  INCLUDES DESTINATION include # Cài đặt include
+)
+
+# --- Xuất export set std_msgs-targets thành file CMake module ---
+# --- Tạo file lib/cmake/std_msgs/std_msgs-targets.cmake ---
+# --- File này chứa cấu hình giúp project khác có thể dùng ---
+# --- Find_package(std_msgs REQUIRED) ---
+# --- Target_link_libraries(my_app PRIVATE std_msgs::std_msgs) ---
+install(EXPORT std_msgs-targets 
+  FILE std_msgs-targets.cmake
+  NAMESPACE std_msgs::
+  DESTINATION lib/cmake/std_msgs
+)