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

问题描述

我读了两者的描述，但我还不明白其中的差别。任何人都可以帮我理解这些差异吗？

  set solib-absolute-prefix  -  
指定包含副本的本地目录在
对应子目录中的目标库。使用gdbserver进行调试时，此选项很有用。 
  

。

  set solib-search-path命令 -  
指定GDB将使用符号搜索共享库的目录。使用gdbserver进行调试时，此选项
非常有用。 
  

谢谢。

解决方案

假设您的目标已加载 /usr/lib/libfoo.so code>，并且在主机上（在GDB运行的地方），你有一个在 / tmp / host 中的整个目标树的副本。也就是说，在 /tmp/host/usr/lib/libfoo.so 主机上找到目标 /usr/lib/libfoo.so 的副本c $ c>。

然后，下面的命令几乎是相同的：

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

现在考虑如果您的目标上还有 /usr/local/lib/libbar.so ，会发生什么情况以及它的副本 /tmp/host/usr/local/lib/libbar.so 。

上面设置的solib-absolute-prefix 仍然很好地定位 libbar.so ，但 solib-search-path 将不得不被修改如此：

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

总之，如果 整个 em>目标树 $ ROOT ，然后将 solib-absolute-prefix 设置为 $ ROOT ，你应该是好的。

但是，如果必须汇编目标路径多个不相交的树，那么带有多个路径的 solib-search-path 将允许GDB找到正确的库。

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.

Thanks.

解决方案

The wording is quite unclear :-(

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.

Then, the following commands are almost equivalent:

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

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.

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

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.

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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