由於嵌套的匿名塊，代碼不能編譯？

爲什麼下面的代碼無法正常工作：

#include <iostream> 
#include <string> 

int main() { 
    { 
     const std::string s = "a string"; 
     std::cout << s << std::endl; 

     { 
      const std::string s = "another string"; 
      std::cout << s << std::endl; 
     } 
    } 
}

不允許我嵌套匿名塊在C++？當試圖編譯源，海灣合作委員會給了我下面的錯誤（我不能作出任何意義）：

hello: In function `_start': 
(.text+0x0): multiple definition of 
`_start' 
/usr/lib/gcc/i486-linux-gnu/4.4.3/../../../../lib/crt1.o:(.text+0x0): 
first defined here 
hello:(.rodata+0x0): multiple 
definition of `_fp_hw' 
/usr/lib/gcc/i486-linux-gnu/4.4.3/../../../../lib/crt1.o:(.rodata+0x0): 
first defined here hello: In function 
`_fini': (.fini+0x0): multiple 
definition of `_fini' 
/usr/lib/gcc/i486-linux-gnu/4.4.3/../../../../lib/crti.o:(.fini+0x0): 
first defined here 
hello:(.rodata+0x4): multiple 
definition of `_IO_stdin_used' 
/usr/lib/gcc/i486-linux-gnu/4.4.3/../../../../lib/crt1.o:(.rodata.cst4+0x0): 
first defined here hello: In function 
`__data_start': (.data+0x0): multiple 
definition of `__data_start' 
/usr/lib/gcc/i486-linux-gnu/4.4.3/../../../../lib/crt1.o:(.data+0x0): 
first defined here hello: In function 
`__data_start': (.data+0x4): multiple 
definition of `__dso_handle' 
/usr/lib/gcc/i486-linux-gnu/4.4.3/crtbegin.o:(.data+0x0): 
first defined here hello: In function 
`_init': (.init+0x0): multiple 
definition of `_init' 
/usr/lib/gcc/i486-linux-gnu/4.4.3/../../../../lib/crti.o:(.init+0x0): 
first defined here /tmp/cchh83A6.o: In 
function `main': 
hello.cpp:(.text+0x0): multiple 
definition of `main' 
hello:(.text+0xb4): first defined here 
/usr/lib/gcc/i486-linux-gnu/4.4.3/crtend.o:(.dtors+0x0): 
multiple definition of `__DTOR_END__' 
hello:(.dtors+0x4): first defined here 
/usr/bin/ld: warning: Cannot create 
.eh_frame_hdr section, --eh-frame-hdr 
ignored. /usr/bin/ld: error in 
hello(.eh_frame); no .eh_frame_hdr 
table will be created. collect2: ld 
returned 1 exit status

來源

2010-11-21 helpermethod

你用什麼命令來編譯和鏈接它？另外，如果你刪除了「匿名塊」，你是否仍然有錯誤？ – 2010-11-21 19:07:57

該錯誤似乎是在您的構建環境中，而不是在您的代碼中。請發佈一些關於您的IDE和構建設置（一個makefile？）的信息，並生成構建命令（您可能在發佈之前在控制檯中看到它）。 – Kos 2010-11-21 19:11:25

命名（非匿名）塊的外觀是什麼？ :) – fredoverflow 2010-11-21 19:26:58