目录切到build中，然后cmake ..，生成VS解决方案

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chengChu 文件夹

SET(LIBRARY_OUTPUT_PATH ${PROJECT_SOURCE_DIR}/lib)
set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON)    #windows构建动态库时 , 加上这个会生成dll文件的同时生成lib文件，否则只会生成dll文件
set(srcs  mul.cpp  div.cpp  )
add_library( ${LIBCHENGCHU}  SHARED  ${srcs})

int  chufa(int a,int b){
 return a/b;
}

int  chengfa(int a,int b){
 return a*b;
}

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jiaJian文件夹

SET(LIBRARY_OUTPUT_PATH  ${PROJECT_SOURCE_DIR}/lib)
set(srcs  add.cpp  sub.cpp )
add_library( ${LIBJIAJIAN}   STATIC  ${srcs})

int jiafa(int a,int b){
 return a+b;
}

int  jianfa(int a,int b){
 return a-b;
}

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include文件夹

int  jiafa(int a,int b);
int  jianfa(int a,int b);
int  chengfa(int a,int b);
int chufa(int a,int b);

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main文件夹 

SET(EXECUTABLE_OUTPUT_PATH    ${PROJECT_BINARY_DIR}/bin)
link_directories(${PROJECT_SOURCE_DIR}/lib)
add_executable(mainPro  main.cpp )
target_link_libraries(mainPro  ${LIBJIAJIAN})
target_link_libraries(mainPro  ${LIBCHENGCHU})

#include <iostream>
using namespace std;
#include "headers.h"

int main(){
cout<<jiafa(8,9)<<endl;
cout<<jianfa(8,9)<<endl;
cout<<chengfa(8,9)<<endl;
cout<<chufa(18,16)<<endl;
getchar();
return 0;
}

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FR：徐海涛(hunkxu)