c++ - mingw32/bin/ld.exe…对[class]的 undefined reference …collect2.exe:错误:ld返回1退出状态

Question

我尝试将代码从Linux迁移到Windows时的问题描述:

Windows链接程序问题

MinGW

当我在Main.cpp中调用用户定义的类时发生

(如果我不在Main中调用用户定义的类构造函数，则效果很好)

相关代码示例:

人.hpp

class Person
{
    public:
        Person(const string& iName, 
                const list<string>& iContactDetails,
               ); 

        virtual ~Person(); 
        ...

Main.cpp

#include "Person.hpp"
...
int main()
{
...
Person myPerson = Person (myName, myContactDetails); //here is the linker problem
...
return 0;
}

编译命令:

独立的

g++ -o MyProgram.exe Main.cpp -Wall

Makefile(甚至尝试使用CC代替CXX，或者使用LDFLAGS = -lgdi32代替CXXFLAGS)

EXECUTABLE = MyProgram.exe

CXX = "C:\MinGW\bin\g++.exe"
CXXFLAGS = -Wall      // tried LDFLAGS=-lgdi32 as well

src = $(wildcard *.cpp)
obj = $(src:.cpp=.o)

all: myprog

myprog: $(obj)
    $(CXX) -o $(EXECUTABLE) $^ $(CXXFLAGS)

.PHONY: clean
clean:
    del $(obj) $(EXECUTABLE)

错误:

c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: C:\Users\....:Main.cpp:(.text+0x124c): undefined reference to `Person::~Person()'
collect2.exe: error: ld returned 1 exit status

作为总结，我在MinGW G++编译步骤中遇到了Linker问题:

All external entity references are resolved. Library components are linked to satisfy external references to entities not defined in the current translation. All such translator output is collected into a program image which contains information needed for execution in its execution environment.

我尝试遵循其他类似的问题，但不幸的是，它们是不同的问题:

C compiler error: undefined reference to function

What is an undefined reference/unresolved external symbol error and how do I fix it?

facing error in linking codes in c++

我应该如何更改我的Makefile或代码？ MinGW在Windows中使用哪些标志？非常感谢你

Answer 1

与我为How to correctly define and link a C++ class destructor to a main file?提供的答案相同

我和你有同样的问题。尝试将构造函数和析构函数定义从cpp移到头文件中。这样，仅通过运行您提到的简单g++命令即可很好地完成链接，而您不需要Makefile。包括告诉您的编译器在哪里可以找到定义。

尝试:

MyClass(const string& className){ _className=className };

如果定义在cpp文件中，则会收到与您相同的错误。