GDB 中的 solib-absolute-prefix 与 solib-search-path [英] solib-absolute-prefix vs. solib-search-path in GDB

问题描述

我阅读了两者的描述，但我还不明白其中的区别.谁能帮我理解这些差异?

I read the description of both but I don't yet understand the difference. Can anyone help me understand the differences?

set solib-absolute-prefix -
Specifies the local directory that contains copies of target libraries in the 
corresponding subdirectories. This option is useful when debugging with gdbserver.

.

set solib-search-path command - 
Specifies directories where GDB will search for shared libraries with symbols. This option        
is useful when debugging with gdbserver.

谢谢.

推荐答案

措辞不清楚:-(

假设您的目标加载了 /usr/lib/libfoo.so，并且在主机(运行 GDB 的地方)上，您在 /中有整个目标树的副本tmp/主机.也就是说，在 /tmp/host/usr/lib/libfoo.so 中的主机上可以找到目标的 /usr/lib/libfoo.so 的副本.

Assume that your target loaded /usr/lib/libfoo.so, and that on the host (where GDB is running), you have a copy of the entire target tree in /tmp/host. That is, a copy of target's /usr/lib/libfoo.so is found on host in /tmp/host/usr/lib/libfoo.so.

那么，下面的命令几乎是等价的:

Then, the following commands are almost equivalent:

set solib-absolute-prefix /tmp/host
set solib-search-path /tmp/host/usr/lib

现在考虑如果目标上还有 /usr/local/lib/libbar.so 会发生什么，并且在 /tmp/host/usr/local/lib 中有一个副本/libbar.so.

Now consider what happens if you also have /usr/local/lib/libbar.so on target, and a copy of it in /tmp/host/usr/local/lib/libbar.so.

上面设置的 solib-absolute-prefix 仍然可以很好地定位 libbar.so，但是 solib-search-path 会有修改如下:

The solib-absolute-prefix as set above is still good to locate libbar.so, but solib-search-path would have to be modified like so:

set solib-search-path /tmp/host/usr/lib:/tmp/host/usr/local/lib

总而言之，如果你在一个主机$ROOT下有整个目标树，那么只需设置solib-absolute-前缀到$ROOT，你应该很好.

To summarize, if you have entire target tree under a single host $ROOT, then just set solib-absolute-prefix to $ROOT and you should be good.

但是如果您必须从多个不相交的树中组装"目标路径，那么具有多个路径的 solib-search-path 将允许 GDB 仍然找到正确的库.

But if you have to "assemble" target paths from multiple disjoint trees, then solib-search-path with multiple paths will allow GDB to still find correct libraries.

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