链接器错误无法在库中找到符号名称 [英] linker error cannot find symbol name in library

问题描述

  g ++（GCC）4.7.2 
 3.7.6-201.fc18.x86_64＃1 SMP Mon Feb 4 15:54:08 UTC 2013 x86_64 x86_64 x86_64 GNU / Linux 
 Fedora release 18（Spherical Cow）
  

你好，

我正在编译并尝试链接程序时出现问题。

链接器错误为：

  / usr / bin / ld：point.o：未定义的符号引用'_Znwj @@ GLIBCXX_3.4'
 / usr / bin / ld：备注：'_Znwj @@ GLIBCXX_3.4'在DSO /lib/libstdc++.so.6中定义，因此请尝试将其添加到链接器命令行
 /lib/libstdc++.so.6：无法读取符号：操作无效
 collect2：error：ld返回1退出状态
  

这个目标文件是 point.o 试图调用libstdc ++中不存在的函数。

当我尝试检查符号名称确实存在使用readelf我无法找到它。

  readelf --all libstdc ++。so.6.0.17 | grep _Znwj @@ GLIBCXX_3.4 
  

这是因为point.o正在寻找一个符号更旧的libstdc ++可能已经在更高版本中被删除了？

非常感谢您的任何建议，

解决方案

在我的情况下，我使用gcc而不是g ++。它曾经在'12工作，但后来在'14'的另一台机器上建立窒息。 gnu编译器确实已经改变。我的答案是添加

  -lstdc ++ 
   
 
。 HTH。
 
g++ (GCC) 4.7.2 
3.7.6-201.fc18.x86_64 #1 SMP Mon Feb 4 15:54:08 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
Fedora release 18 (Spherical Cow)
Hello,

I am compiling and having a problem trying to link a program.

The linker error is:
/usr/bin/ld: point.o: undefined reference to symbol '_Znwj@@GLIBCXX_3.4'
/usr/bin/ld: note: '_Znwj@@GLIBCXX_3.4' is defined in DSO /lib/libstdc++.so.6 so try adding it to the linker command line
/lib/libstdc++.so.6: could not read symbols: Invalid operation
collect2: error: ld returned 1 exit status
This object file is point.o is trying to call a function that doesn't exist in libstdc++.

When I try and check if the symbol name does exist using readelf I can't find it.
readelf --all libstdc++.so.6.0.17 | grep _Znwj@@GLIBCXX_3.4
Is this because the point.o is looking for a symbol in a older libstdc++ that could have been removed in a later version?

Many thanks for any suggestions,
解决方案
In my case I was using gcc not g++.  It used to work in '12, but a later build on a different machine in '14 choked.  The gnu compiler has indeed changed.  The answer in my case was to add
  -lstdc++
onto the end of the linking line, as the error messages suggest.  HTH.

                        
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