一、在使用cmake创建项目，并在make过程中，遇到以下问题的，这里提供定位问题并解决的相关参考

问题描述：make过程出现如下报错——

[ 82%] Building CXX object CMakeFiles/dwsr_wholes.dir/src/yolov5.cpp.o
[ 88%] Linking CXX executable dwsr_wholes

CMakeFiles/...dir/src/yolov5.cpp.o: In function `cv::Rect_<int>::Rect_(int, int, int, int)':
../../include/common_yolo.h:14: multiple definition of `get_rect(cv::Mat&, float*)'
CMakeFiles/...dir/src/main.cpp.o:../../include/common_yolo.h:14: first defined here
CMakeFiles/...dir/src/yolov5.cpp.o: In function `iou(float*, float*)':
../../include/common_yolo.h:41: multiple definition of `iou(float*, float*)'
CMakeFiles/...dir/src/main.cpp.o:../../include/common_yolo.h:41: first defined here
CMakeFiles/...dir/src/yolov5.cpp.o: In function `cmp(Yolo::Detection const&, Yolo::Detection const&)':
../../include/common_yolo.h:56: multiple definition of `cmp(Yolo::Detection const&, Yolo::Detection const&)'
CMakeFiles/...dir/src/main.cpp.o:../../include/common_yolo.h:56: first defined here
CMakeFiles/...dir/src/yolov5.cpp.o: In function `nms(std::vector<Yolo::Detection, std::allocator<Yolo::Detection> >&, float*, float, float)':
../../include/common_yolo.h:60: multiple definition of `nms(std::vector<Yolo::Detection, std::allocator<Yolo::Detection> >&, float*, float, float)'
CMakeFiles/...dir/src/main.cpp.o:../../include/common_yolo.h:60: first defined here
CMakeFiles/...dir/src/yolov5.cpp.o: In function `loadWeights(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)':
../../include/common_yolo.h:89: multiple definition of `loadWeights(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)'
CMakeFiles/...dir/src/main.cpp.o:../../include/common_yolo.h:89: first defined here
CMakeFiles/...dir/src/yolov5.cpp.o: In function `addBatchNorm2d(nvinfer1::INetworkDefinition*, std::map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, nvinfer1::Weights, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, nvinfer1::Weights> > >&, nvinfer1::ITensor&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, float)':
../../include/common_yolo.h:127: multiple definition of `addBatchNorm2d(nvinfer1::INetworkDefinition*, std::map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, nvinfer1::Weights, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, nvinfer1::Weights> > >&, nvinfer1::ITensor&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, float)'
CMakeFiles/...dir/src/main.cpp.o:../../include/common_yolo.h:127: first defined here
CMakeFiles/...dir/src/yolov5.cpp.o: In function `convBlock(nvinfer1::INetworkDefinition*, std::map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, nvinfer1::Weights, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, nvinfer1::Weights> > >&, nvinfer1::ITensor&, int, int, int, int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)':
../../include/common_yolo.h:160: multiple definition of `convBlock(nvinfer1::INetworkDefinition*, std::map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, nvinfer1::Weights, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, nvinfer1::Weights> > >&, nvinfer1::ITensor&, int, int, int, int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)'
CMakeFiles/...dir/src/main.cpp.o:../../include/common_yolo.h:160: first defined here
CMakeFiles/...dir/src/yolov5.cpp.o: In function `focus(nvinfer1::INetworkDefinition*, std::map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, nvinfer1::Weights, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, nvinfer1::Weights> > >&, nvinfer1::ITensor&, int, int, int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)':
../../include/common_yolo.h:178: multiple definition of `focus(nvinfer1::INetworkDefinition*, std::map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, nvinfer1::Weights, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, nvinfer1::Weights> > >&, nvinfer1::ITensor&, int, int, int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)'
CMakeFiles/...dir/src/main.cpp.o:../../include/common_yolo.h:178: first defined here
CMakeFiles/...dir/src/yolov5.cpp.o: In function `bottleneck(nvinfer1::INetworkDefinition*, std::map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, nvinfer1::Weights, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, nvinfer1::Weights> > >&, nvinfer1::ITensor&, int, int, bool, int, float, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)':
../../include/common_yolo.h:189: multiple definition of `bottleneck(nvinfer1::INetworkDefinition*, std::map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, nvinfer1::Weights, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, nvinfer1::Weights> > >&, nvinfer1::ITensor&, int, int, bool, int, float, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)'
CMakeFiles/...dir/src/main.cpp.o:../../include/common_yolo.h:189: first defined here
CMakeFiles/...dir/src/yolov5.cpp.o: In function `bottleneckCSP(nvinfer1::INetworkDefinition*, std::map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, nvinfer1::Weights, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, nvinfer1::Weights> > >&, nvinfer1::ITensor&, int, int, int, bool, int, float, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)':
../../include/common_yolo.h:199: multiple definition of `bottleneckCSP(nvinfer1::INetworkDefinition*, std::map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, nvinfer1::Weights, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, nvinfer1::Weights> > >&, nvinfer1::ITensor&, int, int, int, bool, int, float, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)'
CMakeFiles/...dir/src/main.cpp.o:../../include/common_yolo.h:199: first defined here
CMakeFiles/...dir/src/yolov5.cpp.o: In function `C3(nvinfer1::INetworkDefinition*, std::map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, nvinfer1::Weights, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, nvinfer1::Weights> > >&, nvinfer1::ITensor&, int, int, int, bool, int, float, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)':
../../include/common_yolo.h:222: multiple definition of `C3(nvinfer1::INetworkDefinition*, std::map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, nvinfer1::Weights, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, nvinfer1::Weights> > >&, nvinfer1::ITensor&, int, int, int, bool, int, float, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)'
CMakeFiles/...dir/src/main.cpp.o:../../include/common_yolo.h:222: first defined here
CMakeFiles/...dir/src/yolov5.cpp.o: In function `SPP(nvinfer1::INetworkDefinition*, std::map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, nvinfer1::Weights, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, nvinfer1::Weights> > >&, nvinfer1::ITensor&, int, int, int, int, int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)':
../../include/common_yolo.h:239: multiple definition of `SPP(nvinfer1::INetworkDefinition*, std::map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, nvinfer1::Weights, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, nvinfer1::Weights> > >&, nvinfer1::ITensor&, int, int, int, int, int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)'
CMakeFiles/...dir/src/main.cpp.o:../../include/common_yolo.h:239: first defined here
CMakeFiles/...dir/src/yolov5.cpp.o: In function `SPPF(nvinfer1::INetworkDefinition*, std::map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, nvinfer1::Weights, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, nvinfer1::Weights> > >&, nvinfer1::ITensor&, int, int, int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)':
../../include/common_yolo.h:260: multiple definition of `SPPF(nvinfer1::INetworkDefinition*, std::map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, nvinfer1::Weights, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, nvinfer1::Weights> > >&, nvinfer1::ITensor&, int, int, int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)'
CMakeFiles/...dir/src/main.cpp.o:../../include/common_yolo.h:260: first defined here
CMakeFiles/...dir/src/yolov5.cpp.o: In function `getAnchors(std::map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, nvinfer1::Weights, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, nvinfer1::Weights> > >&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)':
../../include/common_yolo.h:279: multiple definition of `getAnchors(std::map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, nvinfer1::Weights, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, nvinfer1::Weights> > >&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)'
CMakeFiles/...dir/src/main.cpp.o:../../include/common_yolo.h:279: first defined here
CMakeFiles/...dir/src/yolov5.cpp.o: In function `addYoLoLayer(nvinfer1::INetworkDefinition*, std::map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, nvinfer1::Weights, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, nvinfer1::Weights> > >&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::vector<nvinfer1::IConvolutionLayer*, std::allocator<nvinfer1::IConvolutionLayer*> >)':
../../include/common_yolo.h:291: multiple definition of `addYoLoLayer(nvinfer1::INetworkDefinition*, std::map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, nvinfer1::Weights, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, nvinfer1::Weights> > >&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::vector<nvinfer1::IConvolutionLayer*, std::allocator<nvinfer1::IConvolutionLayer*> >)'
CMakeFiles/...dir/src/main.cpp.o:../../include/common_yolo.h:291: first defined here
/usr/bin/ld: error in /usr/bin/c++(.eh_frame); no .eh_frame_hdr table will be created.
collect2: error: ld returned 1 exit status
CMakeFiles/...dir/build.make:1792: recipe for target '..' failed
make[2]: *** [..] Error 1
CMakeFiles/Makefile2:80: recipe for target 'CMakeFiles/...dir/all' failed
make[1]: *** [CMakeFiles/...dir/all] Error 2
Makefile:86: recipe for target 'all' failed
make: *** [all] Error 2

这个日志中有提到 多次定义，那么来找下那里重复定义了

***.h:14: multiple definition of `get_rect(cv::Mat&, float*)'

***.h:14: first defined here

常规方法

使用如下代码，在定义头文件的时候加在首尾

#ifndef ***_H
#define ***_H
/*
代码
*/
#endif

如果得不到解决，并且在全局中搜多不到对应函数的多次定义记录，那么可能遇到的问题是多次加载某个定义，使用以下方法

解决方案：

搜索对应函数所在的文件名，“common_yolo.h”

这个时候回发现，在Makefile过称的中间文件有记录“common_yolo.h”相应的加载记录，可以定位到加载了几次，通过这个方法，自己去确认是否有重复加载的操作，去除掉之后，可以解决问题。

核心原因，多次定义原因在于嵌套定义，新定义的头文件最好不要在头文件里面进行include，同时严格遵照编码准则，方法定义写在cpp里面，不要把方法直接写在头文件里面。

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