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From: "janerikdahlin at yahoo dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug gdb/16079] New: GDB replaces symlinks when reloading the
 executable
Date: Wed, 23 Oct 2013 13:30:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gdb
X-Bugzilla-Component: gdb
X-Bugzilla-Version: 7.6
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: janerikdahlin at yahoo dot com
X-Bugzilla-Status: NEW
X-Bugzilla-Priority: P2
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https://sourceware.org/bugzilla/show_bug.cgi?id=16079

            Bug ID: 16079
           Summary: GDB replaces symlinks when reloading the executable
           Product: gdb
           Version: 7.6
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: janerikdahlin at yahoo dot com

When starting gdb with a symlink in CWD it starts the executable in CWD, but
after reloading the executable, typically after a rebuild, it is started at the
destination of the symlink. This is rather impractical if you rely on the value
of arg[0].

Steps to reproduce:
---------
dalle@blahonga:~$ cat somewhere/foo.c 
#include <stdio.h>

int main (int argc, char *argv[])
{
  puts(argv[0]);
  return 0;
}
dalle@blahonga:~$ gcc -g -o somewhere/foo somewhere/foo.c
dalle@blahonga:~$ ln -s somewhere/foo bar
dalle@blahonga:~$ gdb bar
GNU gdb (GDB) 7.6.1-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 "x86_64-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /home/dalle/somewhere/foo...done.
(gdb) r
Starting program: /home/dalle/bar           <<<< file on the command line
/home/dalle/bar                             <<<< argv from the gdb command line
[Inferior 1 (process 27285) exited normally]
(gdb) ^Z
[1]+  Stopped                 gdb bar
dalle@blahonga:~$ touch somewhere/foo
dalle@blahonga:~$ fg
gdb bar
r
`/home/dalle/somewhere/foo' has changed; re-reading symbols.
Starting program: /home/dalle/somewhere/foo <<<< file the symlink refered to
/home/dalle/somewhere/foo                   <<<< something else
[Inferior 1 (process 27295) exited normally]

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