[Qt-creator] Antwort: Re: Qt Creator 2.0.1 doesn't show local variables when debugging

[Markus Franke]

Dear Andre',

thanks for your reply. I disabled reverse debugging but this didn't have 
any effect for the local variable display.

As soon as I add a local variable from the stack to the "local variable 
window" I get the following message:

for Qt Creator 2.0.1: "<invalid> <unknown>"
for Qt Creator 2.1.0: <no such value>

The debugger log says the following when adding a variable "pMainLayout" 
to the "local variable window":

---snip---
36bb options:fancy vars: expanded: typeformats: formats: 
watchers:73657474696e6723746f6f6c7469702e78232373657474696e672377617463682e302323704d61696e4c61796f75742377617463682e31
<37bb options:fancy vars: expanded: typeformats: formats: 
watchers:73657474696e6723746f6f6c7469702e78232373657474696e672377617463682e302323704d61696e4c61796f75742377617463682e31
>&"bb options:fancy vars: expanded: typeformats: formats: 
watchers:73657474696e6723746f6f6c7469702e78232373657474696e672377617463682e302323704d61696e4c61796f75742377617463682e31\n"
>~"data=[{iname=\"local.this\",addr=\"0xbfffe500\",name=\"this\",valueencoded=\"7\",value=\"\",numchild=\"4\",type=\"SetDisplayDlg\",value=\"<not 
accessible>\",},{iname=\"local.pParent\",addr=\"0xbfffe504\",name=\"pParent\",addr=\"0xbfffe504\",numchild=\"1\",type=\"QWidget 
*\",value=\"0x83bc470\",},,{iname=\"tooltip.x\",name=\"setting\",exp=\"setting\",value=\"<invalid>\",type=\"<unknown>\",numchild=\"0\",value=\"<not 
accessible>\",},{iname=\"watch.0\",name=\"setting\",exp=\"setting\",value=\"<invalid>\",type=\"<unknown>\",numchild=\"0\",value=\"<not 
accessible>\",},{iname=\"watch.1\",name=\"pMainLayout\",exp=\"pMainLayout\",value=\"<invalid>\",type=\"<unknown>\",numchild=\"0\",value=\"<not 
accessible>\",},]\n"
>36^done
<<Rebuild Watchmodel 9>
sFinished retrieving data
>&"bb options:fancy vars: expanded: typeformats: formats: 
watchers:73657474696e6723746f6f6c7469702e78232373657474696e672377617463682e302323704d61696e4c61796f75742377617463682e31\n"
>~"data=[{iname=\"local.this\",addr=\"0xbfffe500\",name=\"this\",valueencoded=\"7\",value=\"\",numchild=\"4\",type=\"SetDisplayDlg\",value=\"<not 
accessible>\",},{iname=\"local.pParent\",addr=\"0xbfffe504\",name=\"pParent\",addr=\"0xbfffe504\",numchild=\"1\",type=\"QWidget 
*\",value=\"0x83bc470\",},,{iname=\"tooltip.x\",name=\"setting\",exp=\"setting\",value=\"<invalid>\",type=\"<unknown>\",numchild=\"0\",value=\"<not 
accessible>\",},{iname=\"watch.0\",name=\"setting\",exp=\"setting\",value=\"<invalid>\",type=\"<unknown>\",numchild=\"0\",value=\"<not 
accessible>\",},{iname=\"watch.1\",name=\"pMainLayout\",exp=\"pMainLayout\",value=\"<invalid>\",type=\"<unknown>\",numchild=\"0\",value=\"<not 
accessible>\",},]\n"
>37^done
<<Rebuild Watchmodel 10>
sFinished retrieving data
<<Rebuild Watchmodel 11>
sFinished retrieving data
---snap---

I am using gdb 7.2 right now.

As far as I can see this only happens for local variables in constructors 
of my classes. In member functions the locals get displayed properly.

Any comments on this?

Best regards,
Markus Franke

qt-creator-bounces+franke.m=sebakmt.com at qt.nokia.com schrieb am 10.03.2011 
17:34:10:

> On Thu, Mar 10, 2011 at 09:02:22AM +0100, Markus Franke wrote:
> > qt-creator-bounces+franke.m=sebakmt.com at qt.nokia.com schrieb am 
09.03.2011 
> > 17:24:53:
> > 
> > > I'd need to see the debugger log (Debugger->Views->Debugger). 
Perhaps
> > > an too old version of gdb. I'd suggest to upgrade to Creator 2.1 and
> > > gdb 7.2 anyway.
> > 
> > The debugger log says the following: (sorry for spamming this list)
> > 
> > ---snip---
> > [...]
> > dEnableReverseDebugging: true  (default: false)
> 
> That's the main problem.
> 
> > [...]
> > <369target record
> > >&"warning: Unable to find dynamic linker breakpoint function.\nGDB 
will 
> > be unable to debug shared library initializers\nand track explicitly 
> > loaded dynamic code."
> 
> Switch off "Reverse debugging". The feature is broken in gdb, even now
> with 7.2. gdb 6.8 was even worse.
> 
> > Same happens with Qt Creator 2.1.0. I am on a Fedora 10 system using 
gdb 
> > 6.8.
> 
> gdb 6.8 is not supported with 2.1.0. Install gdb 7.2 or compile from 
source,
> or get a precompiled one from ftp://ftp.qt.nokia.com/misc/gdb/7.2/
> 
> Andre'
> _______________________________________________
> Qt-creator mailing list
> Qt-creator at qt.nokia.com
> http://lists.qt.nokia.com/mailman/listinfo/qt-creator



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