[Bug gdb/15415] gdb resolves symbolic links when passing argv[0]

[Bug gdb/15415] gdb resolves symbolic links when passing argv[0]

[palves at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=15415

Pedro Alves <palves at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dak at gnu dot org

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[Bug gdb/15415] New: gdb resolves symbolic links when passing argv[0]

[palves at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=15415

             Bug #: 15415
           Summary: gdb resolves symbolic links when passing argv[0]
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
        AssignedTo: unassigned@sourceware.org
        ReportedBy: palves@redhat.com
    Classification: Unclassified


Submitting on behalf of David Kastrup.  Ref:
<http://lists.gnu.org/archive/html/bug-gdb/2013-04/msg00001.html>

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

(...)

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).

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[Bug gdb/15415] gdb resolves symbolic links when passing argv[0]

[ian at hulin dot org.uk]

http://sourceware.org/bugzilla/show_bug.cgi?id=15415

Ian Hulin <ian at hulin dot org.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ian at hulin dot org.uk

--- Comment #1 from Ian Hulin <ian at hulin dot org.uk> 2013-05-17 00:06:53 UTC ---
This is really flakey and has cost me several days effort on my project
establishing that this is a gdb bug.  

Here are the gdb versions I have found this on and a short terminal session
transcript:

ian@nanny-ogg ~/src/lilypond/build (T3154)$ gdb --command ../.gdbinit
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/>.
Breakpoint 1 at 0x834b744: file /home/ian/src/lilypond/flower/warn.cc,
line 191.
Breakpoint 2 at 0x8147057: file /home/ian/src/lilypond/lily/grob.cc,
line 729.
(gdb) run
Starting program: /home/ian/src/lilypond/build/lily/out/lilypond
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".
GNU LilyPond 2.17.19
warning: not relocating, no 2.17.19/ or current/ found under
/home/ian/src/lilypond/build/lily/share/lilypond/
ERROR: In procedure primitive-load-path:
ERROR: Unable to find file "lily.scm" in load path
[Inferior 1 (process 11595) exited with code 01]
(gdb)
=======================================================================

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[Bug gdb/15415] gdb resolves symbolic links when passing argv[0]

[florian.baumert at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=15415

Florian Baumert <florian.baumert at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |florian.baumert at gmail dot com

--- Comment #2 from Florian Baumert <florian.baumert at gmail dot com> ---
Replacing xfullpath with gdb_realname seems to have triggered this.

http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/source.c.diff?r1=1.153.2.3&r2=1.136&cvsroot=src&f=h

We use symbolic links to executables a lot, so this breaks our ability to debug
programs at the moment.

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[Bug gdb/15415] gdb resolves symbolic links when passing argv[0]

[florian.baumert at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=15415

--- Comment #3 from Florian Baumert <florian.baumert at gmail dot com> ---
Sorry, gdb_realpath instead of gdb_realname.

(In reply to Florian Baumert from comment #2)
> Replacing xfullpath with gdb_realname seems to have triggered this.
> 
> http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/source.c.diff?r1=1.153.2.
> 3&r2=1.136&cvsroot=src&f=h
> 
> We use symbolic links to executables a lot, so this breaks our ability to
> debug programs at the moment.

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[Bug gdb/15415] gdb resolves symbolic links when passing argv[0]

[florian.baumert at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=15415

--- Comment #4 from Florian Baumert <florian.baumert at gmail dot com> ---
Created attachment 7108
  --> http://sourceware.org/bugzilla/attachment.cgi?id=7108&action=edit
Patch for following symlinks

Fix which works for me (at least in the cases we tried, not thoroughly tested)

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[Bug gdb/15415] gdb resolves symbolic links when passing argv[0]

[jan.kratochvil at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=15415

Jan Kratochvil <jan.kratochvil at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
                 CC|                            |jan.kratochvil at redhat dot com
           Assignee|unassigned at sourceware dot org   |jan.kratochvil at redhat dot com

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[Bug gdb/15415] gdb resolves symbolic links when passing argv[0]

[dje at google dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=15415

dje at google dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dje at google dot com

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[Bug gdb/15415] gdb resolves symbolic links when passing argv[0]

[dje at google dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=15415

--- Comment #5 from dje at google dot com ---
Another thing to consider is auxiliary file names based on the name of the
binary.  e.g. ${foo}-gdb.py, ${foo}.dwp.

I can imagine some situations wanting gdb to xfullpath $foo and I can imagine
some situations wanting gdb to realpath $foo.
gdb needs to either try both (maybe fullpath first, then realpath) or give the
user a way to specify which one.
[It would be simplest to do the former if that works in a sufficient number of
cases.]

Given that a realpath operation cannot be undone (one can't get back the
original path), I suggest for now we go back to using xfullpath, and then start
working on support for realpath.

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[Bug gdb/15415] gdb resolves symbolic links when passing argv[0]

[jan.kratochvil at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=15415

--- Comment #6 from Jan Kratochvil <jan.kratochvil at redhat dot com> ---
[patch] [7.6.1] Fix argv[0] symlink regression (PR 15415)
https://sourceware.org/ml/gdb-patches/2013-08/msg00764.html
Message-ID: <20130826182111.GA19509@host2.jankratochvil.net>

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[Bug gdb/15415] gdb resolves symbolic links when passing argv[0]

[cvs-commit at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=15415

--- Comment #7 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
CVSROOT:    /cvs/src
Module name:    src
Changes by:    jkratoch@sourceware.org    2013-08-28 17:52:03

Modified files:
    gdb            : ChangeLog corefile.c defs.h exec.c exec.h 
                     inferior.c progspace.c progspace.h source.c 
    gdb/mi         : mi-main.c 
    gdb/testsuite  : ChangeLog 
Added files:
    gdb/testsuite/gdb.base: argv0-symlink.c argv0-symlink.exp 

Log message:
    PR gdb/15415

    gdb/
    2013-08-27  Jan Kratochvil  <jan.kratochvil@redhat.com>

    PR gdb/15415
    * corefile.c (get_exec_file): Use exec_filename.
    * defs.h (OPF_DISABLE_REALPATH): New definition.  Add new comment.
    * exec.c (exec_close): Free EXEC_FILENAME.
    (exec_file_attach): New variable canonical_pathname.  Use
    OPF_DISABLE_REALPATH.  Call gdb_realpath explicitly.  Set
    EXEC_FILENAME.
    * exec.h (exec_filename): New.
    * inferior.c (print_inferior, inferior_command): Use
    PSPACE_EXEC_FILENAME.
    * mi/mi-main.c (print_one_inferior): Likewise.
    * progspace.c (clone_program_space, print_program_space): Likewise.
    * progspace.h (struct program_space): New field pspace_exec_filename.
    * source.c (openp): Describe OPF_DISABLE_REALPATH.  New variable
    realpath_fptr, initialize it from OPF_DISABLE_REALPATH, use it.

    gdb/testsuite/
    2013-08-27  Jan Kratochvil  <jan.kratochvil@redhat.com>

    PR gdb/15415
    * gdb.base/argv0-symlink.c: New file.
    * gdb.base/argv0-symlink.exp: New file.

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/ChangeLog.diff?cvsroot=src&r1=1.15939&r2=1.15940
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/corefile.c.diff?cvsroot=src&r1=1.74&r2=1.75
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/defs.h.diff?cvsroot=src&r1=1.332&r2=1.333
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/exec.c.diff?cvsroot=src&r1=1.127&r2=1.128
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/exec.h.diff?cvsroot=src&r1=1.21&r2=1.22
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/inferior.c.diff?cvsroot=src&r1=1.42&r2=1.43
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/progspace.c.diff?cvsroot=src&r1=1.17&r2=1.18
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/progspace.h.diff?cvsroot=src&r1=1.12&r2=1.13
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/source.c.diff?cvsroot=src&r1=1.163&r2=1.164
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/mi/mi-main.c.diff?cvsroot=src&r1=1.238&r2=1.239
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/ChangeLog.diff?cvsroot=src&r1=1.3789&r2=1.3790
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.base/argv0-symlink.c.diff?cvsroot=src&r1=NONE&r2=1.1
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.base/argv0-symlink.exp.diff?cvsroot=src&r1=NONE&r2=1.1

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[Bug gdb/15415] gdb resolves symbolic links when passing argv[0]

[cvs-commit at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=15415

--- Comment #8 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
CVSROOT:    /cvs/src
Module name:    src
Branch:     gdb_7_6-branch
Changes by:    jkratoch@sourceware.org    2013-08-28 17:55:56

Modified files:
    gdb            : ChangeLog corefile.c defs.h exec.c exec.h 
                     inferior.c progspace.c progspace.h source.c 
    gdb/mi         : mi-main.c 
    gdb/testsuite  : ChangeLog 
Added files:
    gdb/testsuite/gdb.base: argv0-symlink.c argv0-symlink.exp 

Log message:
    PR gdb/15415

    gdb/
    2013-08-27  Jan Kratochvil  <jan.kratochvil@redhat.com>

    PR gdb/15415
    * corefile.c (get_exec_file): Use exec_filename.
    * defs.h (OPF_DISABLE_REALPATH): New definition.  Add new comment.
    * exec.c (exec_close): Free EXEC_FILENAME.
    (exec_file_attach): New variable canonical_pathname.  Use
    OPF_DISABLE_REALPATH.  Call gdb_realpath explicitly.  Set
    EXEC_FILENAME.
    * exec.h (exec_filename): New.
    * inferior.c (print_inferior, inferior_command): Use
    PSPACE_EXEC_FILENAME.
    * mi/mi-main.c (print_one_inferior): Likewise.
    * progspace.c (clone_program_space, print_program_space): Likewise.
    * progspace.h (struct program_space): New field pspace_exec_filename.
    * source.c (openp): Describe OPF_DISABLE_REALPATH.  New variable
    realpath_fptr, initialize it from OPF_DISABLE_REALPATH, use it.

    gdb/testsuite/
    2013-08-27  Jan Kratochvil  <jan.kratochvil@redhat.com>

    PR gdb/15415
    * gdb.base/argv0-symlink.c: New file.
    * gdb.base/argv0-symlink.exp: New file.

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/ChangeLog.diff?cvsroot=src&only_with_tag=gdb_7_6-branch&r1=1.15260.2.58&r2=1.15260.2.59
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/corefile.c.diff?cvsroot=src&only_with_tag=gdb_7_6-branch&r1=1.72&r2=1.72.2.1
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/defs.h.diff?cvsroot=src&only_with_tag=gdb_7_6-branch&r1=1.329&r2=1.329.2.1
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/exec.c.diff?cvsroot=src&only_with_tag=gdb_7_6-branch&r1=1.122&r2=1.122.2.1
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/exec.h.diff?cvsroot=src&only_with_tag=gdb_7_6-branch&r1=1.20&r2=1.20.2.1
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/inferior.c.diff?cvsroot=src&only_with_tag=gdb_7_6-branch&r1=1.41&r2=1.41.2.1
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/progspace.c.diff?cvsroot=src&only_with_tag=gdb_7_6-branch&r1=1.17&r2=1.17.2.1
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/progspace.h.diff?cvsroot=src&only_with_tag=gdb_7_6-branch&r1=1.12&r2=1.12.2.1
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/source.c.diff?cvsroot=src&only_with_tag=gdb_7_6-branch&r1=1.153.2.3&r2=1.153.2.4
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/mi/mi-main.c.diff?cvsroot=src&only_with_tag=gdb_7_6-branch&r1=1.228&r2=1.228.2.1
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/ChangeLog.diff?cvsroot=src&only_with_tag=gdb_7_6-branch&r1=1.3580.2.23&r2=1.3580.2.24
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.base/argv0-symlink.c.diff?cvsroot=src&only_with_tag=gdb_7_6-branch&r1=NONE&r2=1.1.2.2
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.base/argv0-symlink.exp.diff?cvsroot=src&only_with_tag=gdb_7_6-branch&r1=NONE&r2=1.1.2.2

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[Bug gdb/15415] gdb resolves symbolic links when passing argv[0]

[jan.kratochvil at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=15415

Jan Kratochvil <jan.kratochvil at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
            Version|HEAD                        |7.6
         Resolution|---                         |FIXED
   Target Milestone|---                         |7.6

--- Comment #9 from Jan Kratochvil <jan.kratochvil at redhat dot com> ---
Fixed in trunk and for 7.6.1.

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[Bug gdb/15415] gdb resolves symbolic links when passing argv[0]

[jan.kratochvil at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=15415

Jan Kratochvil <jan.kratochvil at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|7.6                         |7.6.1

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[Bug gdb/15415] gdb resolves symbolic links when passing argv[0]

[cvs-commit at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=15415

--- Comment #10 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
CVSROOT:    /cvs/src
Module name:    src
Changes by:    jkratoch@sourceware.org    2013-10-13 16:11:08

Modified files:
    gdb            : ChangeLog exec.c utils.c utils.h 
    gdb/testsuite  : ChangeLog 
    gdb/testsuite/gdb.base: argv0-symlink.exp 

Log message:
    Improve Executable displayed path (PR 15415 regression kind #2)

    gdb/
    2013-10-13  Jan Kratochvil  <jan.kratochvil@redhat.com>

    Canonicalize directories for EXEC_FILENAME.
    * exec.c (exec_file_attach): Use gdb_realpath_keepfile for
    exec_filename.
    * utils.c (gdb_realpath_keepfile): New function.
    * utils.h (gdb_realpath_keepfile): New declaration.

    gdb/testsuite/
    2013-10-13  Jan Kratochvil  <jan.kratochvil@redhat.com>

    Canonicalize directories for EXEC_FILENAME.
    * gdb.base/argv0-symlink.exp
    (kept file symbolic link name for info inferiors): New.
    (kept directory symbolic link name): Setup kfail.
    (kept directory symbolic link name for info inferiors): New.

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/ChangeLog.diff?cvsroot=src&r1=1.16100&r2=1.16101
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/exec.c.diff?cvsroot=src&r1=1.129&r2=1.130
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/utils.c.diff?cvsroot=src&r1=1.309&r2=1.310
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/utils.h.diff?cvsroot=src&r1=1.13&r2=1.14
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/ChangeLog.diff?cvsroot=src&r1=1.3835&r2=1.3836
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.base/argv0-symlink.exp.diff?cvsroot=src&r1=1.1&r2=1.2

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[Bug gdb/15415] gdb resolves symbolic links when passing argv[0]

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=15415

Tom Tromey <tromey at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |janerikdahlin at yahoo dot com

--- Comment #12 from Tom Tromey <tromey at sourceware dot org> ---
*** Bug 16079 has been marked as a duplicate of this bug. ***

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[Bug gdb/15415] gdb resolves symbolic links when passing argv[0]

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=15415

--- Comment #13 from Tom Tromey <tromey at sourceware dot org> ---
*** Bug 15652 has been marked as a duplicate of this bug. ***

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[Bug gdb/15415] gdb resolves symbolic links when passing argv[0]

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=15415

Tom Tromey <tromey at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |lakkurvarun at gmail dot com

--- Comment #14 from Tom Tromey <tromey at sourceware dot org> ---
*** Bug 24143 has been marked as a duplicate of this bug. ***

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[Bug gdb/15415] gdb resolves symbolic links when passing argv[0]

[sam at gentoo dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=15415

Sam James <sam at gentoo dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://sourceware.org/bugz
                   |                            |illa/show_bug.cgi?id=24143

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[Bug gdb/15415] gdb resolves symbolic links when passing argv[0]

[sam at gentoo dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=15415

Sam James <sam at gentoo dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sam at gentoo dot org

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