Re: gdb 7.5.91 resolves symbolic links when passing argv[0]
Hello David, On 04/28/2013 10:14 AM, David Kastrup wrote: I've reported this to the Ubuntu bug tracker, but judging from the package files, I can't find proof that it has been introduced downstream. I'm afraid that issues reported on this list often end up ignored/forgotten. I'm not exactly sure why we still have it. Could you report this to the upstream bug tracker? It's at: http://sourceware.org/bugzilla/ Sorry for the extra trouble. Thanks, -- Pedro Alves ___ bug-gdb mailing list bug-gdb@gnu.org https://lists.gnu.org/mailman/listinfo/bug-gdb
Re: gdb 7.5.91 resolves symbolic links when passing argv[0]
Pedro Alves pal...@redhat.com writes: Hello David, On 04/28/2013 10:14 AM, David Kastrup wrote: I've reported this to the Ubuntu bug tracker, but judging from the package files, I can't find proof that it has been introduced downstream. I'm afraid that issues reported on this list often end up ignored/forgotten. I'm not exactly sure why we still have it. Could you report this to the upstream bug tracker? It's at: http://sourceware.org/bugzilla/ Sorry for the extra trouble. I have not been able to figure out all the right categories: the tracker is completely befuddling to me. That's why I reverted to the list instead of registering on yet-another-website for just a single use which I'd probably get wrong anyway. I have verified that the problem is still present in current master (checking out the git mirror). I have not been able to figure out just when it has been introduced, and I don't have a clue where to look in the code (the obvious grep for readlink did not really succeed in letting me find a suspect). -- David Kastrup ___ bug-gdb mailing list bug-gdb@gnu.org https://lists.gnu.org/mailman/listinfo/bug-gdb
Re: gdb 7.5.91 resolves symbolic links when passing argv[0]
On 04/29/2013 11:36 AM, David Kastrup wrote: I have not been able to figure out all the right categories: the tracker is completely befuddling to me. That's why I reverted to the list instead of registering on yet-another-website for just a single use which I'd probably get wrong anyway. Fair enough. I've filed it for you: http://sourceware.org/bugzilla/show_bug.cgi?id=15415 -- Pedro Alves ___ bug-gdb mailing list bug-gdb@gnu.org https://lists.gnu.org/mailman/listinfo/bug-gdb
gdb 7.5.91 resolves symbolic links when passing argv[0]
I've reported this to the Ubuntu bug tracker, but judging from the package files, I can't find proof that it has been introduced downstream. The Ubuntu problem description is at URL:https://bugs.launchpad.net/ubuntu/+source/gdb/+bug/1173562. I copy the description and example here: Calling gdb on an executable that is a symbolic link will pass the target of the symbolic link rather than the specified link as argv[0] to the program. As a result, if the program relies on the contents of argv[0] (for example, for figuring out paths relative to the executable or making decisions based on the name the executable has been called under), debugging fails. Here is an example for a program relying on its argv[0] name: /usr/bin/latex is a symbolic link to /usr/bin/pdftex, and pdftex loads a format depending on the name under which it has been called. As a result, latex '\stop' will load the latex.fmt format and finish processing while the same will fail under gdb since argv[0] is being passed as /usr/bin/pdftex instead of /usr/bin/latex: dak@lola:/tmp$ latex '\stop' This is pdfTeX, Version 3.1415926-2.4-1.40.13 (TeX Live 2012/Debian) restricted \write18 enabled. entering extended mode LaTeX2e 2011/06/27 Babel v3.8m and hyphenation patterns for english, dumylang, nohyphenation, bu lgarian, ukrainian, russian, loaded. No pages of output. Transcript written on texput.log. dak@lola:/tmp$ gdb latex GNU gdb (GDB) 7.5.91.20130417-cvs-ubuntu Copyright (C) 2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type show copying and show warranty for details. This GDB was configured as i686-linux-gnu. For bug reporting instructions, please see: http://www.gnu.org/software/gdb/bugs/... Reading symbols from /usr/bin/pdftex...(no debugging symbols found)...done. (gdb) run '\stop' Starting program: /usr/bin/pdftex '\stop' This is pdfTeX, Version 3.1415926-2.4-1.40.13 (TeX Live 2012/Debian) restricted \write18 enabled. entering extended mode ! Undefined control sequence. * \stop ? Thanks for caring! -- David Kastrup ___ bug-gdb mailing list bug-gdb@gnu.org https://lists.gnu.org/mailman/listinfo/bug-gdb
