[Bug external/13207] New: Provide a script to advance two versions of a program and find where they diverge.

[Bug external/13207] New: Provide a script to advance two versions of a program and find where they diverge.

[dje at google dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13207

             Bug #: 13207
           Summary: Provide a script to advance two versions of a program
                    and find where they diverge.
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: external
        AssignedTo: unassigned@sourceware.org
        ReportedBy: dje@google.com
    Classification: Unclassified


Sometimes one has a debugging situation where a program worked yesterday, it
doesn't work today, and it's taking awhile to figure out where the breakage is.

IWBN to have a script that could advance two versions of a program and find
where they diverge.  Determining divergence can be tricky - functions may not
live at the same address and may be different (however slightly).  Maybe the
basic machinery of advance/test/repeat could be parameterized to handle the
easier scenarios and leave it at that.

Such a script feels like more of a contrib-like patch, than part of gdb proper,
but it still feels like something gdb could/should provide.
When it works, it's a real timesaver, and the basic infrastructure shouldn't be
that hard to write in python (and if it is then we've found good places where
python needs to be extended).

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[Bug external/13207] Provide a script to advance two versions of a program and find where they diverge.

[pedro at codesourcery dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13207

Pedro Alves <pedro at codesourcery dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pedro at codesourcery dot
                   |                            |com

--- Comment #1 from Pedro Alves <pedro at codesourcery dot com> 2011-09-20 22:04:45 UTC ---
Someone already writte something like that before, and posted it on the
gdb@ list.  Something called twingdb.  It check divergence based on line
numbers.
I'm sure it could be extended with a more controllable predicate for
divergence.

<http://permalink.gmane.org/gmane.comp.gdb.devel/27451>

Never used it myself though.

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[Bug external/13207] Provide a script to advance two versions of a program and find where they diverge.

[pedro at codesourcery dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13207

--- Comment #2 from Pedro Alves <pedro at codesourcery dot com> 2011-09-20 22:06:47 UTC ---
I had the felling I already had seen a similar PR... See PR12938.  Can we close
one of these as duplicate?

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[Bug external/13207] Provide a script to advance two versions of a program and find where they diverge.

[dje at google dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13207

dje at google dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |DUPLICATE

--- Comment #3 from dje at google dot com 2011-09-20 22:15:12 UTC ---
closed as dup

*** This bug has been marked as a duplicate of bug 12938 ***

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