使用 gcc 编译 C++ 程序 [英] Compiling a C++ program with gcc

问题描述

问题:如何用gcc编译器编译C++程序?

Question: How to compile a C++ program with gcc compiler?

信息.c:

#include<iostream>
using std::cout;
using std::endl;
int main()
{
   #ifdef __cplusplus
   cout << "C++ compiler in use and version is " << __cplusplus << endl;
   #endif
   cout <<"Version is " << __STDC_VERSION__ << endl;
   cout << "Hi" << __FILE__ << __LINE__ << endl;
}

当我尝试编译 info.c

$ gcc info.C

Undefined                       first referenced
 symbol                             in file
cout                                /var/tmp/ccPxLN2a.o
endl(ostream &)                     /var/tmp/ccPxLN2a.o
ostream::operator<<(ostream &(*)(ostream &))/var/tmp/ccPxLN2a.o
ostream::operator<<(int)            /var/tmp/ccPxLN2a.o
ostream::operator<<(long)           /var/tmp/ccPxLN2a.o
ostream::operator<<(char const *)   /var/tmp/ccPxLN2a.o
ld: fatal: Symbol referencing errors. No output written to a.out
collect2: ld returned 1 exit status

gcc 编译器不能编译 C++ 程序吗?在相关说明中，gcc 和 g++ 之间有什么区别.谢谢，

推荐答案

gcc 实际上可以很好地编译 C++ 代码.您收到的错误是链接器错误，而不是编译器错误.

gcc can actually compile c++ code just fine. The errors you received are linker errors, not compiler errors.

如果你把编译行改成这样:

Odds are that if you change the compilation line to be this:

gcc info.C -lstdc++

这使它链接到标准的 C++ 库，然后它就可以正常工作了.

which makes it link to the standard c++ library, then it will work just fine.

然而，你应该让你的生活更轻松并使用 g++.

However, you should just make your life easier and use g++.

Rup 在 他对另一个答案的评论:

[...] gcc 将选择正确的后端编译器基于文件扩展名(即将将 .c 编译为 C，将 .cc 编译为 C++)并将二进制文件链接到标准 C 和 GCC 帮助程序库由默认与输入语言无关；g++ 也会选择正确的后端基于扩展，除了我认为它编译了所有 C 源代码作为 C++ 代替(即它同时编译.c 和 .cc 作为 C++)，它包括无论如何，libstdc++ 在其链接步骤中输入语言.

[...] gcc will select the correct back-end compiler based on file extension (i.e. will compile a .c as C and a .cc as C++) and links binaries against just the standard C and GCC helper libraries by default regardless of input languages; g++ will also select the correct back-end based on extension except that I think it compiles all C source as C++ instead (i.e. it compiles both .c and .cc as C++) and it includes libstdc++ in its link step regardless of input languages.

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