在这里,我们将看到如何使用GCC(GNU C编译器)编译C ++程序。让我们考虑一下,我们要编译这个程序。
#include<iostream> using namespace std; main() { cout << "Hello World. This is C++ program" << endl; }
如果这是一个C程序,我们可以像下面这样用GCC进行编译-
gcc test.c
但是,如果我们将c ++文件名放在该区域中,则可能会产生一些错误。
gcc test.cpp
输出结果
/tmp/ccf1KGDi.o: In function `main': 1325.test.cpp:(.text+0xe): undefined reference to `std::cout' 1325.test.cpp:(.text+0x13): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)' 1325.test.cpp:(.text+0x1d): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::endl<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&)' 1325.test.cpp:(.text+0x28): undefined reference to `std::ostream::operator<<(std::ostream& (*)(std::ostream&))' /tmp/ccf1KGDi.o: In function `__static_initialization_and_destruction_0(int, int)': 1325.test.cpp:(.text+0x58): undefined reference to `std::ios_base::Init::Init()' 1325.test.cpp:(.text+0x6d): undefined reference to `std::ios_base::Init::~Init()' collect2: error: ld returned 1 exit status $
这不是编译错误。这是链接错误。要添加正确的链接器,我们必须使用–lstdc ++选项。
gcc test.cpp -lstdc++
输出结果
$ ./a.out Hello World. This is C++ program $