Describe the current behavior / 问题描述 (Mandatory / 必填)

执行官网教程文档C++极简推理demo执行build.sh文件后报2个cmake相关的错误

Environment / 环境信息 (Mandatory / 必填)

• Hardware Environment(Ascend/GPU/CPU) / 硬件环境: CPU

Please delete the backend not involved / 请删除不涉及的后端:
/device ascend/GPU/CPU/kirin/等其他芯片cpu

• Software Environment / 软件环境 (Mandatory / 必填):
  -- MindSpore version (e.g., 1.7.0.Bxxx) :1.7
  -- Python version (e.g., Python 3.7.5) :3.8.1
  -- OS platform and distribution (e.g., Linux Ubuntu 16.04):unbantu 18.04
  -- GCC/Compiler version (if compiled from source): 7.5

• Excute Mode / 执行模式 (Mandatory / 必填)(PyNative/Graph):

Please delete the mode not involved / 请删除不涉及的模式:
/mode pynative
/mode graph

Related testcase / 关联用例 (Mandatory / 必填)

NA

Steps to reproduce the issue / 重现步骤 (Mandatory / 必填)

1. https://www.mindspore.cn/lite/docs/zh-CN/master/quick_start/quick_start_cpp.html进行C++极简推理demo操作
2. 执行mindspore/lite/examples/quick_start_cpp目录下执行build脚本

Describe the expected behavior / 预期结果 (Mandatory / 必填)

按教程将自动下载MindSpore Lite推理框架库以及文模型文件并编译Demo
#实际结果
运行build.sh失败，报了2个cmake相关的错误，脚本意外中止

Related log / screenshot / 日志 / 截图 (Mandatory / 必填)

Consolidate compiler generated dependencies of target mindspore_quick_start_cpp
[ 50%] Building CXX object CMakeFiles/mindspore_quick_start_cpp.dir/main.cc.o
[100%] Linking CXX executable mindspore_quick_start_cpp
CMakeFiles/mindspore_quick_start_cpp.dir/main.cc.o：在函数‘QuickStart(int, char const**)’中：
main.cc:(.text+0xc2d)：对‘mindspore::Model::Build(void const*, unsigned long, mindspore::ModelType, std::shared_ptrmindspore::Context const&)’未定义的引用
collect2: error: ld returned 1 exit status
CMakeFiles/mindspore_quick_start_cpp.dir/build.make:96: recipe for target 'mindspore_quick_start_cpp' failed
make[2]: *** [mindspore_quick_start_cpp] Error 1
CMakeFiles/Makefile2:82: recipe for target 'CMakeFiles/mindspore_quick_start_cpp.dir/all' failed
make[1]: *** [CMakeFiles/mindspore_quick_start_cpp.dir/all] Error 2
Makefile:90: recipe for target 'all' fai

Special notes for this issue/备注 (Optional / 选填)