用gdb调试c ++程序 [英] debugging c++ programs with gdb

问题描述

当我们调试C ++应用程序时，是否有一些缺省函数在GDB上打印对象，如字符串？如：toString（）;

或者我的类必须实现类似的东西？

解决方案

您可以使用 print 打印 std :: string （或其他任何东西） c>命令。然而，在C ++模板容器内部挣扎可能不愉快。在最近版本的工具链中（GDB + Python + Pretty Printers通常作为大多数用户友好的Linux发行版中的开发包的一部分安装在一起），这些工具链会自动识别并打印（非常漂亮！）。例如：



  $ cat test.cpp 
 #include< string> 
 #include< iostream> 
 
 int main（）
 {
 std :: string s =Hello，World！; 
 std :: cout<< s<<的std :: ENDL; 
 
 
 $ g ++ -Wall -ggdb -o test ./test.cpp 
 $ gdb ./test 
 
（gdb）break main $ 
（gdb）运行
启动程序：/ tmp / test 
 
断点1，main（
断点1在0x400ae5处：文件./test.cpp， ）at ./test.cpp:6 
 6 std :: string s =Hello，World！; 
缺少单独的debuginfos，请使用：debuginfo-install glibc-2.16-28.fc18.x86_64 libgcc-4.7.2-8.fc18.x86_64 libstdc ++  -  4.7.2-8.fc18.x86_64 
（gdb ）next 
 7 std :: cout<< s<<的std :: ENDL; 
（gdb）p s 
 $ 1 =Hello，World！ 
（gdb）
  

正如@ 111111所指出的，请查看 http://sourceware.org/gdb/wiki/STLSupport 了解如何自行安装它的说明。

Is there some "default function" to print a object like a string on the GDB when we are debugging C++ applications? Something like: toString();

Or my class have to implement something like that?

解决方案

You could always have printed std::string (or anything else for that matter) using print command. However, struggling with C++ template container internals might not be pleasant. In the recent versions of toolchains (GDB + Python + Pretty Printers that are usually installed together as part of the development packages on most user-friendly Linux distros), those are automatically recognized and printed (pretty!). For example:

$ cat test.cpp 
#include <string>
#include <iostream>

int main()
{
    std::string s = "Hello, World!";
    std::cout << s << std::endl;
}

$ g++ -Wall -ggdb -o test ./test.cpp 
$ gdb ./test 

(gdb) break main
Breakpoint 1 at 0x400ae5: file ./test.cpp, line 6.
(gdb) run
Starting program: /tmp/test 

Breakpoint 1, main () at ./test.cpp:6
6       std::string s = "Hello, World!";
Missing separate debuginfos, use: debuginfo-install glibc-2.16-28.fc18.x86_64 libgcc-4.7.2-8.fc18.x86_64 libstdc++-4.7.2-8.fc18.x86_64
(gdb) next
7       std::cout << s << std::endl;
(gdb) p s
$1 = "Hello, World!"
(gdb) 

As @111111 pointed out, check out http://sourceware.org/gdb/wiki/STLSupport for instructions on how to get this installed yourself.

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