[Bug c++/15440] New: set print object produces values not matching inferior

[Bug c++/15440] New: set print object produces values not matching inferior

[jan.kratochvil at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=15440

             Bug #: 15440
           Summary: set print object produces values not matching inferior
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned@sourceware.org
        ReportedBy: jan.kratochvil@redhat.com
    Classification: Unclassified
            Target: x86_64-unknown-linux-gnu


#include <stdio.h>
class C {
public:
  int i=1;
  virtual void m() {}
};
class D : public C {
public:
  int i=2;
} d;
C *cp = &d;
int main() {
  printf("%d\n",cp->i);
}


(gdb) start
13      printf("%d\n",cp->i);
(gdb) p cp->i
$1 = 1
(gdb) set print object on
(gdb) p cp->i
$2 = 2
    ^^^ = GDB output
(gdb) next
1
^^ = inferior output

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[Bug c++/15440] set print object produces values not matching inferior

[tromey at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=15440

Tom Tromey <tromey at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tromey at redhat dot com

--- Comment #1 from Tom Tromey <tromey at redhat dot com> ---
I assume this is because "set print object on" inexplicably
affects expression evaluation, not just printing.
That seems wrong to me.
I think we should introduce a new setting, like
"set print object print-only" and make it the default.

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[Bug c++/15440] set print object produces values not matching inferior

[jan.kratochvil at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=15440

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jan.kratochvil at redhat dot com

--- Comment #2 from Jan Kratochvil <jan.kratochvil at redhat dot com> ---
Why is there a problem fixing "set print object"?

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[Bug c++/15440] set print object produces values not matching inferior

[tromey at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=15440

--- Comment #3 from Tom Tromey <tromey at redhat dot com> ---
I don't have a problem with it.  I anticipate that perhaps others
will, though, since it is a behavior change, and the behavior dates
back many years.  I suppose we could give it a try and see if anyone
complains.

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[Bug c++/15440] set print object produces values not matching inferior

[tromey at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=15440

Tom Tromey <tromey at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Blocks|                            |16106

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