#include<iostream>

 using namespace std;

 int main()

 {

  cout<<"hello world!"<<endl;

  return ;

 }

[zsj@localhost aa]$ ldd test

        linux-vdso.so. =>  (0x00007ffff64ac000)

        libstdc++.so. => /usr/lib64/libstdc++.so. (0x0000003a67000000)

        libm.so. => /lib64/libm.so. (0x0000003a5b000000)

        libgcc_s.so. => /lib64/libgcc_s.so. (0x0000003a66000000)

        libc.so. => /lib64/libc.so. (0x0000003a5a400000)

        /lib64/ld-linux-x86-.so. (0x0000003a59c00000)

gcc/g++ 在执行编译时，需要4步

1 预处理,生成.i的文件[使用-E参数]

2 将预处理后的文件不转换成汇编语言,生成文件.s[使用-S参数]

[zsj@localhost aa]$ g++ -E test.cpp >> test.i

[zsj@localhost aa]$ g++ -S test.i >> test.s

[zsj@localhost aa]$ g++ -c test.s >>test.o

[zsj@localhost aa]$ g++ test.o -o test

[zsj@localhost aa]$ ls

test  test.cpp  test.i  test.o  test.s

[zsj@localhost aa]$ ./test

hello world!

[zsj@localhost aa]$ gcc test.cpp -o test

/tmp/cceNJsOV.o: In function `main':

test.cpp:(.text+0xa): undefined reference to `std::cout'

test.cpp:(.text+0xf): 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*)'

test.cpp:(.text+0x14): 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> >&)'

test.cpp:(.text+0x1c): undefined reference to `std::basic_ostream<char, std::char_traits<char> >::operator<<(std::basic_ostream<char, std::char_traits<char> >& (*)(std::basic_ostream<char, std::char_traits<char> >&))'

/tmp/cceNJsOV.o: In function `__static_initialization_and_destruction_0(int, int)':

test.cpp:(.text+0x4a): undefined reference to `std::ios_base::Init::Init()'

test.cpp:(.text+0x4f): undefined reference to `std::ios_base::Init::~Init()'

/tmp/cceNJsOV.o:(.eh_frame+0x12): undefined reference to `__gxx_personality_v0'

collect2: ld 返回 

[zsj@localhost aa]$ gcc -lstdc++ test.cpp -o test

[zsj@localhost aa]$ ./test

hello world!