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Re: dynlib_addr and stripped dynamic modules

From: Eli Zaretskii
Subject: Re: dynlib_addr and stripped dynamic modules
Date: Mon, 07 Dec 2015 20:48:29 +0200

> From: Philipp Stephani <address@hidden>
> Date: Mon, 07 Dec 2015 18:37:55 +0000
> Eli Zaretskii <address@hidden> schrieb am So., 22. Nov. 2015 um 19:25 Uhr:
>     Does dynlib_laddr (and its underlying library function dladdr) work on
>     Posix hosts when the module was stripped of any unneeded symbols?
>     Well written Emacs modules will have all but one of its functions
>     static and un-exported, so the only way to access the name of a
>     function by its address is to read a symbol table of some kind. Does
>     that work with *.so files that were run through "strip --strip-unneeded"?
> Probably not, but I haven't tested it. I've added dladdr because I found it
> useful for debugging myself and it's easy to implement, and I guess during
> debugging people will often work with unstripped libraries. 

The information from dynlib_addr is used every time there's a fatal
error in a module, so it's not just for debugging the module by its
author, it's also for users to report when they encounter errors while
using the module.

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