如何防止GDB加载（大型）库的调试符号？ [英] How to prevent GDB from loading debugging symbol for a (large) library?

问题描述

在调试Qt 5应用程序时，我有时对Qt 5的内部没有兴趣，而是对应用程序本身的结构感兴趣。因此，我不需要加载Qt 5库的所有调试符号，因为这些需要几秒钟才能加载。

是否可以阻止GDB为这些加载符号Qt 5库，同时保留我的应用程序的调试符号？

解决方案

是否有可能阻止GDB从加载这些Qt 5库的符号，同时保留我的应用程序的调试符号？

是。

正如Richard Critten的评论所述，设置 auto-solib-add 到 0 将防止所有共享库，然后您可以使用 sharedlibrar y 命令（它接受一个正则表达式）。如果这个正则表达式被省略，那么所有的共享库都会被加载。然而，这会阻止自动加载所有的符号（不仅仅是调试符号），并且还可以防止系统库的符号自动加载，这通常需要解开堆栈。

更好的方法可能是保存Qt5的副本具有完整调试信息的库，例如〜/ Qt5-debug / ，然后在原始库上运行 strip -g 。这样，您将获得所有库的符号信息，并且在极少数情况下，当您真的需要Qt5的全面调试信息时，仍然可以使用GDB 文件〜/ Qt5-debug / libQt5Core .so.5.2 或类似命令。

来自GDB手册的GDB文件有更多关于使用这些独立调试符号的文档。

While debugging a Qt 5 application, I am sometimes not interested in the internals of Qt 5 but in the structure of the application itself. Therefore I do not need to load all debugging symbols of the Qt 5 libraries since these take a few seconds to load.

Is it possible to prevent GDB from loading symbols for these Qt 5 libraries while keeping the debugging symbols for my application?

解决方案

Is it possible to prevent GDB from loading symbols for these Qt 5 libraries while keeping the debugging symbols for my application?

Yes.

As Richard Critten's comment mentions, setting auto-solib-add to 0 will prevent loading of symbols for all shared libraries, and you can then add files manually with the sharedlibrary command (which accepts a regex). If this regex is omitted, then all shared libraries are loaded.

That however would prevent auto-loading of all symbols (not just debug symbols), and would also prevent auto-loading of symbols for system libraries, which are often required to unwind the stack.

A better approach may be to save a copy of Qt5 libraries with full debug info somewhere, e.g. ~/Qt5-debug/, then run strip -g on the original libraries. That way, you will get symbolic info for all libraries, and in the rare case when you actually need full-debug info for Qt5, you can still do that using the GDB file ~/Qt5-debug/libQt5Core.so.5.2 or similar commands.

The chapter GDB Files from the GDB manual has more documentation on using such separate debugging symbols.

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