使gdb从特定路径加载共享库 [英] make gdb load a shared library from a specific path

问题描述

在执行应用程序时我得到了一个核心，我保存了应用程序在 / tmp 中使用的可执行文件，核心文件和共享库，以便稍后检查它们。然后我修改了库，重新构建了它并再次启动了可执行文件。
现在，当我尝试调试内核时，gdb从其原始路径加载共享库，而不是从保存原始库的目录 / tmp 中加载。

例如，原始路径是 /opt/mydir/lib/libmylib.so.0 。
gdb正在加载这个共享库，而我希望它加载 /tmp/libmylib.so.0 。
应用程序还使用一些标准库，它们位于 / usr / lib 和 / lib 目录中，所以我不希望这些路径被改变。只需要更改 / opt / mydir / lib / - > / tmp 。我该怎么做？

解决方案

最简单的解决方案是临时恢复 /opt/mydir/lib/libmylib.so.0 添加到在崩溃时使用的副本（即现在位于 / tmp ），分析核心，然后恢复新版本。

如果你不想这样做， set solib-search-path 和 set sysroot 是你的朋友。

请注意，您必须在加载核心之前设置。这个序列应该可以工作：

 （gdb）set sysroot / no / such / file 
（gdb）set solib- search-path / tmp：/ usr / lib：/ lib 
（gdb）core / tmp / core 
  

I got a core while executing an application and I saved the executable, the corefile and a shared library which the application use in /tmp to check them later. I then modified the library, rebuilt it and started the executable again. Now when I am trying to debug the core, gdb is loading the shared library from its original path and not from the directory /tmp where I saved the original library.

For example, the original path was /opt/mydir/lib/libmylib.so.0. gdb is loading this shared library, while I want it to load /tmp/libmylib.so.0. The application also uses some standard libraries which are in /usr/lib and /lib directories so I don't want these paths to get changed. Just want to change /opt/mydir/lib/ -> /tmp. How can I do that?

解决方案

The simplest solution is to temporarily restore /opt/mydir/lib/libmylib.so.0 to the copy that was used at crash time (i.e. the one now in /tmp), analyse the core, then restore back the new version.

If you don't want to do that, set solib-search-path and set sysroot are your friends.

Note that you must set both before loading the core. This sequence should work:

(gdb) set sysroot /no/such/file
(gdb) set solib-search-path /tmp:/usr/lib:/lib
(gdb) core /tmp/core

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