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編譯C++代碼時出錯？

2010-03-02 240 views
0

這是我test.cpp：編譯C++代碼時出錯？

#include <iostream.h> 
class C { 
public: 
C(); 
~C(); 
}; 

int main() 
{ 
C obj; 
return 0; 
}

當我編譯使用命令g++ test.cpp它，我得到這個錯誤信息：

 
    In file included from /usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/backward/iostream.h:31, 
        from test.cpp:1: 
    /usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/backward/backward_warning.h:32:2: warning: #warning This file includes at least one deprecated or antiquated header. Please consider using one of the 32 headers found in section 17.4.1.2 of the C++ standard. Examples include substituting the header for the header for C++ includes, or instead of the deprecated header . To disable this warning use -Wno-deprecated. 
    /cygdrive/c/Users/aswinik_sattaluri/AppData/Local/Temp/ccoYkiAS.o:test.cpp:(.text+0x131): undefined reference to `C::C()' 
    /cygdrive/c/Users/aswinik_sattaluri/AppData/Local/Temp/ccoYkiAS.o:test.cpp:(.text+0x13c): undefined reference to `C::~C()' 
    collect2: ld returned 1 exit status

與gcc test.cpp編譯給出類似的消息，甚至更多：

 
    In file included from /usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/backward/iostream.h:31, 
        from test.cpp:1: 
    /usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/backward/backward_warning.h:32:2: warning: #warning This file includes at least one deprecated or antiquated header. Please consider using one of the 32 headers found in section 17.4.1.2 of the C++ standard. Examples include substituting the header for the header for C++ includes, or instead of the deprecated header . To disable this warning use -Wno-deprecated. 
    /cygdrive/c/Users/aswinik_sattaluri/AppData/Local/Temp/cc3ntGx0.o:test.cpp:(.text+0xd): undefined reference to `std::basic_string, std::allocator >::size() const' 
    /cygdrive/c/Users/aswinik_sattaluri/AppData/Local/Temp/cc3ntGx0.o:test.cpp:(.text+0x60): undefined reference to `std::basic_string, std::allocator >::operator[](unsigned int) const' 
    /cygdrive/c/Users/aswinik_sattaluri/AppData/Local/Temp/cc3ntGx0.o:test.cpp:(.text+0x9f): undefined reference to `std::basic_string, std::allocator >::operator[](unsigned int) const' 
    /cygdrive/c/Users/aswinik_sattaluri/AppData/Local/Temp/cc3ntGx0.o:test.cpp:(.text+0xce): undefined reference to `std::basic_string, std::allocator >::operator[](unsigned int) const' 
    /cygdrive/c/Users/aswinik_sattaluri/AppData/Local/Temp/cc3ntGx0.o:test.cpp:(.text+0x131): undefined reference to `C::C()' 
    /cygdrive/c/Users/aswinik_sattaluri/AppData/Local/Temp/cc3ntGx0.o:test.cpp:(.text+0x13c): undefined reference to `C::~C()' 
    /cygdrive/c/Users/aswinik_sattaluri/AppData/Local/Temp/cc3ntGx0.o:test.cpp:(.text+0x165): undefined reference to `std::ios_base::Init::Init()' 
    /cygdrive/c/Users/aswinik_sattaluri/AppData/Local/Temp/cc3ntGx0.o:test.cpp:(.text+0x180): undefined reference to `std::ios_base::Init::~Init()' 
    collect2: ld returned 1 exit status

請注意，我沒有設置LD_LIBRARY_PATH：

 
    bash-3.2$ echo $LD_LIBRARY_PATH 

    bash-3.2$

來源

2010-03-02 aks

+1

正確格式化您的代碼（請使用下次預覽！）。仍然 - 問題是什麼？ – 2010-03-02 07:39:15

+0

所有標準的C++頭文件都沒有擴展名。 – GManNickG 2010-03-02 08:04:41

回答

10

聲明該存在的構造函數和析構函數，但沒有提供實現。嘗試：

class C { 
public: 
    C() {} 
    ~C() {} 
};

而且，對於C++程序，用g++編譯（在你的第一次嘗試）。

來源

2010-03-02 07:41:28

4

您需要定義你的C構造函數和destuctor：

C::C() 
{ 
} 

C::~C() 
{ 
}

此外，堅持用G ++編譯。如果仔細觀察，使用gcc進行編譯時出現的錯誤包括使用g ++獲得的所有內容以及額外的錯誤。

來源

2010-03-02 07:41:08

9

更換

#include <iostream.h>

通過

#include <iostream>

，並提供實現，至少空，C類的構造函數和析構函數的

來源

2010-03-02 07:41:23 Arun

4

您包含iostream.h而不是iostream，這就是爲什麼您會收到關於此的警告。你也聲明瞭一個構造函數和一個析構函數，但你並沒有在任何地方實現它。因此，鏈接器抱怨未定義的符號。

您需要添加實現爲C的方法，如：

C::C() { 
    // ... 
}

來源

2010-03-02 07:41:36 sth

5

因爲你不提供一個實際的問題，我有你想知道什麼猜測。無論如何，我的2c是：

  • 不要使用iostream.h，該標頭是預標準的，並且過時。使用<iostream>而不是
  • 您不提供任何構造函數和析構函數的實現，它是鏈接器所抱怨的C。而不是#include <iostream.h>

來源

2010-03-02 07:43:03

+1

+1，第一個人說*爲什麼*你應該更喜歡'iostream'到'iostream.h'，而不是僅僅指出你應該。 – 2010-03-02 08:53:47

0

使用#include <iostream>你應該正確讀取錯誤。

來源

2010-03-02 07:43:28 coder

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