Question

我的代码在CodeLite中按预期编译和运行。然后我尝试在Clion中运行相同的代码，但它给了我这个错误：

Scanning dependencies of target leastSquareFitting
[ 50%] Building CXX object CMakeFiles/leastSquareFitting.dir/main.cpp.o
[100%] Linking CXX executable leastSquareFitting
Undefined symbols for architecture x86_64:
  "printMatrix(Matrix)", referenced from:
      _main in main.cpp.o
  "constructMatrix(int, std::__1::vector<double, 
std::__1::allocator<double> >)", referenced from:
      _main in main.cpp.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see 
invocation)
make[3]: *** [leastSquareFitting] Error 1
make[2]: *** [CMakeFiles/leastSquareFitting.dir/all] Error 2
make[1]: *** [CMakeFiles/leastSquareFitting.dir/rule] Error 2
make: *** [leastSquareFitting] Error 2

我试图在线搜索此错误，但根据我找到的内容无法解决。这是我的代码：

的main.cpp

#include "fullMatrix.h"
#include <cstdio>
#include <iostream>
#include <vector>
using namespace std;
int main()
{
    vector<double> value = {1.0,2.0,3.0,4.0};
    Matrix m = constructMatrix(2, value);
    printMatrix(m);
    return 0;
}

fullMatrix.cpp

#include "fullMatrix.h"
#include <iostream>
#include <vector>
#include "cmath"
#include <cstdio>
using namespace std;


Matrix constructMatrix(int size, vector<double> x) {
    //initiate variables of a matrix
    Matrix myMatrix;
    myMatrix.size = size;
    myMatrix.value = x;
    return myMatrix;
}

void printMatrix(Matrix matrix){
    // Loop through rows and columns to display all values
    for (int row = 0; row < matrix.size; row++) {
        for (int col = 0; col < matrix.size; col++) {
            cout <<matrix.value[col+row*matrix.size] << " ";
        }
        cout << endl;
    }
}

fullMatrix.h

#ifndef fullMatrix_h
#define fullMatrix_h
#include <vector>
using namespace std;

struct Matrix
{
    int size;
    vector<double> value;
};
Matrix constructMatrix(int size, vector<double> x);

void printMatrix(Matrix matrix);

#endif

我是CMake的新手，这就是CMakeLists.txt中的内容：

cmake_minimum_required(VERSION 3.10)
project(leastSquareFitting)

set(CMAKE_CXX_STANDARD 11)

add_executable(leastSquareFitting main.cpp)

谢谢！任何帮助表示赞赏！

Answer 1

将CMakeLists的最后一行更改为：

add_executable(leastSquareFitting main.cpp fullMatrix.cpp)

什么链接器告诉你的是它找不到编译的文件包含函数printMatrix，如果你看看你的cmake的输出，你看到cmake的只是编译main.cpp中，但没有fullMatrix的提的.cpp：

Building CXX object CMakeFiles/leastSquareFitting.dir/main.cpp.o

它没有提到另一个文件的原因是你没有告诉它该文件也是你的来源的一部分。

Clion未定义的体系结构符号x86_64

1 个答案: