通过libstdc ++进行调试

问题描述

我在GNU / Linux上使用gcc，并安装了libc和libstd ++的调试文件和头文件。但是我不知道如何让gdb使用它们的源代码，特别是调试到libstd ++。
libstdc ++本身的源代码似乎以复杂的结构提供。我认为目录命令是正确的选择。我在这里使用Debian / Ubuntu，并将源代码下载到我的主目录中。

我很确定我不需要为Fedora（几年前）采取特别的步骤。 Fedora也许是以一种特殊的方式准备的。所以我会很高兴一般的说明，适合每一个发行。

谢谢

更新

我想出来，除了 -g 之外，我需要使用 -D_GLIBCXX_DEBUG code>，所以编译命令看起来像 $ g ++ -o test test.cpp -g -D_GLIBCXX_DEBUG 。

此外，我得到了关于缺少漂亮打印机的警告，我按照这里所述解决了：

现在我可以调试到libstdc ++，但是我总是得到这个消息：

 断点1，main（） at test.cpp：9 
 9 string str =str; 
（gdb）s 
 std :: allocator< char> :: allocator（this = 0x7fffffffe1e0）
 at /build/buildd/gcc-4.7-4.7.2/build/x86_64-linux -gnu / libstdc ++  -  v3 / include / bits / allocator.h：104 
 104 /build/buildd/gcc-4.7-4.7.2/build/x86_64-linux-gnu/libstdc++-v3/include/bits/ allocator.h：没有这样的文件或目录。 
（gdb）s 
 std :: basic_string< char，std :: char_traits< char>，std :: allocator< char> > :: basic_string（
 this = 0x7fffffffe1c0，__s = 0x402930str，__a = ...）
 at /usr/include/c++/4.7/bits/basic_string.tcc:217 
 217 __s + npos，__a），__a）
  

我不需要设置目录在我的下载源（我认为通过我的主目录搜索）。所以我想我需要一个不同的命令来解决这个问题，并发现set substitute-path并将其指向 /home/username/gcc-4.7-4.7.2/gcc-4.7.2/libstdc ++ - v3 但我不工作。为什么gdb在完全错误的地方寻找 allocator.h ？

解决方案

首先找出来源： -

稍后将DEBUG_FLAGS编译libstdc ++设置为ON。

然后，尝试使用gdb调试。

I'm using gcc on GNU/Linux and the debug-files and headers of libc and libstd++ are installed. But I don't know how to tell gdb to use the source-code of them, especially to debug into libstd++.The source-code of libstdc++ itself seems to be provided in a complicated structure. I think the directory command is the right choice. I'm using here Debian/Ubuntu and downloaded the source with apt-get source libstdc++6 into my home-directory.

I'm pretty sure I didn't need take special steps for this with Fedora (some years ago). Maybe Fedora was prepared in a special way for this. So I will be glad about general instructions, which fit for every distribution.

Thank you

Update
I figured out, that I need to compile with -D_GLIBCXX_DEBUG in addition to -g, so compile command looks like $ g++ -o test test.cpp -g -D_GLIBCXX_DEBUG.

Furthermore I got warning about missing pretty printers, which I solved as described here:http://gcc.gnu.org/onlinedocs/libstdc++/manual/debug.html#debug.gdb

Now I can debug into libstdc++, but I always got this message:

Breakpoint 1, main () at test.cpp:9
9       string str = "str";
(gdb) s
std::allocator<char>::allocator (this=0x7fffffffe1e0)
    at /build/buildd/gcc-4.7-4.7.2/build/x86_64-linux-gnu/libstdc++-v3/include/bits/allocator.h:104
104 /build/buildd/gcc-4.7-4.7.2/build/x86_64-linux-gnu/libstdc++-v3/include/bits/allocator.h: No such file or directory.
(gdb) s
std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string (
    this=0x7fffffffe1c0, __s=0x402930 "str", __a=...)
    at /usr/include/c++/4.7/bits/basic_string.tcc:217
217                    __s + npos, __a), __a)

I don't need to set the directory in gdb to the my downloaded source (I' think it search through my home-directory). So I thought I need a different command to fix this and found "set substitute-path" and pointed it to /home/username/gcc-4.7-4.7.2/gcc-4.7.2/libstdc++-v3 but I doesn't work. Why does gdb look for allocator.h in the completely wrong place?

解决方案

First find out the sources from :-https://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/index.html

Later compile libstdc++ with DEBUG_FLAGS set it ON.

Then, try it out to debug with gdb.

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