Re: [Qt-creator] Remote debugging armv5te using Qt Creator

Fri, 05 Mar 2010 02:02:05 -0800

Hello,

It's me again with my Qt Creator/GDB issues...

I've set the GDB sysroot and debug is now working but there is an issue evaluating Qt objects. For example I don't see QString values in the debug window.

You can see below the interesting parts of my GDB debug log (commented) . The sysroot is set to /home/gdrz9888/dev/BSP/eeebook_oe/tmp/rootfs/

{...}

>&"source /home/gdrz9888/dev/gdbstartupfile\n"
t10:40:25.461
>212^done
tResponse time: source /home/gdrz9888/dev/gdbstartupfile: 0.302 s
t10:40:25.461
t10:40:25.461
>&"set environment LD_PRELOAD /home/gdrz9888/qtsdk-2010.01/qt/qtc-debugging-helper/libgdbmacros.so\n"
t10:40:25.461
>213^done
tResponse time: set environment LD_PRELOAD /home/gdrz9888/qtsdk-2010.01/qt/qtc-debugging-helper/libgdbmacros.so: 0.302 s
t10:40:25.461
t10:40:25.461
>&"set architecture i386\n"
t10:40:25.461
>&"Undefined item: \"i386\".\n"
t10:40:25.461
>214^error,msg="Undefined item: \"i386\"."
tResponse time: set architecture i386: 0.299 s

>>>>>>>>>> I don't know why this variable is set to this value. Perhaps according to i386 architecture ?! It's pointing to my x86 Qt library but I think It must point to my device Qt library.

{...}

>~"0x40000800 in ?? () from /home/gdrz9888/dev/BSP/eeebook_oe/tmp/rootfs/lib/ld-linux.so.3\n"
t10:40:25.583
>216^done
tResponse time: target remote 192.168.2.202:2345: 0.122 s
dState changed from InferiorStarting(6) to InferiorStopped(13).
dINFERIOR STARTED
sAttaché au processus inférieur.
<217set substitute-path /var/tmp/qt-x11-src-4.6.1 /home/gdrz9888/qtsdk-2010.01/qt
sDéfinit les points d'arrêts...
<218-break-list
t10:40:25.585
t10:40:25.626
>&"set substitute-path /var/tmp/qt-x11-src-4.6.1 /home/gdrz9888/qtsdk-2010.01/qt\n"
t10:40:25.626
>217^done
tResponse time: set substitute-path /var/tmp/qt-x11-src-4.6.1 /home/gdrz9888/qtsdk-2010.01/qt: 0.041 s
t10:40:25.626
t10:40:25.626

{...}

>220*stopped,reason="breakpoint-hit",bkptno="1",thread-id="1",frame={addr="0x0000a566",func="main",args=[{name="argc",value="1"},{name="argv",value="0xbea05d14"}],file="main.cpp",fullname="/home/gdrz9888/dev/local/KeycodeTester/main.cpp",line="10"}
dState changed from InferiorRunning(10) to InferiorStopping(11).
dState changed from InferiorStopping(11) to InferiorStopped(13).
<221call (void*)qDumpObjectData440(1,221+1,0,0,0,0,0,0)
<222p (char*)&qDumpOutBuffer
<223p 4
t10:40:27.990
t10:40:28.041
>&"call (void*)qDumpObjectData440(1,221+1,0,0,0,0,0,0)\n"
t10:40:28.041
>&"No symbol \"qDumpObjectData440\" in current context.\n"
t10:40:28.041
>221^error,msg="No symbol \"qDumpObjectData440\" in current context."
tResponse time: call (void*)qDumpObjectData440(1,0.051+1,0,0,0,0,0,0): %2 s
t10:40:28.041
t10:40:28.041
>&"p (char*)&qDumpOutBuffer\n"
t10:40:28.041
>&"No symbol \"qDumpOutBuffer\" in current context.\n"
t10:40:28.041
>222^error,msg="No symbol \"qDumpOutBuffer\" in current context."
tResponse time: p (char*)&qDumpOutBuffer: 0.051 s
sAssistance au débogage non trouvée.

>>>>>>>>>> It seems Qt is looking for "Debug assistance" (I don't know if it's the right name in english) but he's not finding it. What is it's purpose ?

{...}

>&"info shared\n"
t10:40:28.301
>~"From        To          Syms Read   Shared Object Library\n"
t10:40:28.302
>~"0x40000800  0x40017b24  Yes         /home/gdrz9888/dev/BSP/eeebook_oe/tmp/rootfs/lib/ld-linux.so.3\n"
t10:40:28.302
>~"0x401e3454  0x40890b14  Yes         /home/gdrz9888/dev/BSP/eeebook_oe/tmp/rootfs/usr/lib/libQtGui.so.4\n"
t10:40:28.302
>~"0x409f091c  0x409f0f20  Yes         /home/gdrz9888/dev/BSP/eeebook_oe/tmp/rootfs/usr/lib/libts-1.0.so.0\n"
t10:40:28.302
>~"0x409fd6c8  0x40a10828  Yes         /home/gdrz9888/dev/BSP/eeebook_oe/tmp/rootfs/usr/lib/libpng12.so.0\n"
t10:40:28.302
>~"0x40a23570  0x40a5944c  Yes         /home/gdrz9888/dev/BSP/eeebook_oe/tmp/rootfs/usr/lib/libfreetype.so.6\n"
t10:40:28.302
>~"0x40ab416c  0x40b73cf4  Yes         /home/gdrz9888/dev/BSP/eeebook_oe/tmp/rootfs/usr/lib/libQtNetwork.so.4\n"
t10:40:28.302
>~"0x40c18d80  0x40dafea4  Yes         /home/gdrz9888/dev/BSP/eeebook_oe/tmp/rootfs/usr/lib/libQtCore.so.4\n"
t10:40:28.302
>~"0x40e9f6a8  0x40ea6c84  Yes         /home/gdrz9888/dev/BSP/eeebook_oe/tmp/rootfs/usr/lib/libz.so.1\n"
t10:40:28.302
>~"0x40eb45a0  0x40eb7c2c  Yes         /home/gdrz9888/dev/BSP/eeebook_oe/tmp/rootfs/lib/librt.so.1\n"
t10:40:28.302
>~"0x40ec28d0  0x40ec365c  Yes         /home/gdrz9888/dev/BSP/eeebook_oe/tmp/rootfs/lib/libdl.so.2\n"
t10:40:28.302
>~"0x40ed0ca0  0x40edd734  Yes         /home/gdrz9888/dev/BSP/eeebook_oe/tmp/rootfs/lib/libpthread.so.0\n"
t10:40:28.302
>~"0x40f2ad50  0x40f82698  Yes         /home/gdrz9888/dev/BSP/eeebook_oe/tmp/rootfs/usr/lib/libstdc++.so.6\n"
t10:40:28.302
>~"0x40fa8190  0x4100bbcc  Yes         /home/gdrz9888/dev/BSP/eeebook_oe/tmp/rootfs/lib/libm.so.6\n"
t10:40:28.302
>~"0x4104d230  0x41053fb8  Yes         /home/gdrz9888/dev/BSP/eeebook_oe/tmp/rootfs/lib/libgcc_s.so.1\n"
t10:40:28.302
>~"0x41071770  0x4114b760  Yes         /home/gdrz9888/dev/BSP/eeebook_oe/tmp/rootfs/lib/libc.so.6\n"
t10:40:28.302
>~"0x41181c98  0x4119d318  Yes         /home/gdrz9888/dev/BSP/eeebook_oe/tmp/rootfs/usr/lib/libssl.so.0.9.8\n"
t10:40:28.302
>~"0x411e4e08  0x4125b560  Yes         /home/gdrz9888/dev/BSP/eeebook_oe/tmp/rootfs/usr/lib/libcrypto.so.0.9.8\n"
t10:40:28.302
>~"                        No          /usr/lib/qtopia/plugins/gfxdrivers/libk1900qt.so\n"

>>>>>>>>>> Thanks to Christian, librairies are now found using the sysroot variable

{...}

>239^done,locals=[{name="a",type="struct QApplication"},{name="w",type="class MainWindow"},{name="toto",type="QString"}]
tResponse time: -stack-list-locals 2: 0.08 s
t10:40:32.019
t10:40:32.019
>240^done,stack=[frame={level="0",addr="0x0000a574",func="main",file="main.cpp",fullname="/home/gdrz9888/dev/local/KeycodeTester/main.cpp",line="12"}]
tResponse time: -stack-list-frames 0 20: 0.08 s
t10:40:32.019
t10:40:32.019
>241^done,thread-ids={thread-id="1"},number-of-threads="1"
tResponse time: -thread-list-ids: 0.08 s
t10:40:32.019
<242-var-delete "local.a"
<243-var-create "local.a" * "a"
<244-var-delete "local.w"
<245-var-create "local.w" * "w"
<246-var-delete "local.toto"
<247-var-create "local.toto" * "toto"
t10:40:32.119
>242^done,ndeleted="1"
tResponse time: -var-delete "local.a": 0.077 s
t10:40:32.119
t10:40:32.119
>243^done,name="local.a",numchild="0",value="{...}",type="struct QApplication"
tResponse time: -var-create "local.a" * "a": 0.076 s
t10:40:32.119
t10:40:32.120
>244^done,ndeleted="1"
tResponse time: -var-delete "local.w": 0.077 s
t10:40:32.120
t10:40:32.120
>245^done,name="local.w",numchild="3",value="{...}",type="class MainWindow"
tResponse time: -var-create "local.w" * "w": 0.077 s
t10:40:32.120
t10:40:32.120
>&"Variable object not found\n"
t10:40:32.120
>246^error,msg="Variable object not found"
tResponse time: -var-delete "local.toto": 0.077 s
t10:40:32.120
t10:40:32.120
>247^done,name="local.toto",numchild="2",value="{...}",type="QString"
tResponse time: -var-create "local.toto" * "toto": 0.077 s
t10:40:32.120
<248-var-evaluate-_expression_ "local.a"
<249-var-evaluate-_expression_ "local.w"
<250-var-evaluate-_expression_ "local.toto"
t10:40:32.176
>248^done,value="{...}"
tResponse time: -var-evaluate-_expression_ "local.a": 0.048 s
t10:40:32.178
t10:40:32.178
>249^done,value="{...}"
tResponse time: -var-evaluate-_expression_ "local.w": 0.041 s
t10:40:32.178
t10:40:32.178
>250^done,value="{...}"
tResponse time: -var-evaluate-_expression_ "local.toto": 0.031 s
<<Rebuild Watchmodel 7>
sCollecte des données terminée.
t10:40:32.178

>>>>>>>>>> I created a test QString object named "toto" but when I stopped after its initialization, I can't see its value in the debug window. How can I solve this issue ?

Thanks a lot for your help.

Guillaume Ménant





Christian Kandeler wrote: 
On Thursday 25 February 2010 16:01:38 ext [email protected] 
wrote:

  
I'm using Qt Creator 1.3.1.
About the sysroot, I don't know what I have to put in it (which path). It's
 probably my main problem though ! GDB is looking for libQtGui.so.4 in
 /usr/lib and the file is there (see below). I don't understand why he
 doesn't find it...
    

Gdb needs to find the libraries from the target device on the host as well, to 
display debug information. I assume the Qt libs it finds in /usr/lib are the 
x86 versions. You have to tell gdb where on your PC to find the set of target 
libraries. The easiest way to do that is to put a copy of the device OS' file 
system tree on the host system (only libraries and perhaps header files are 
needed) and point the sysroot variable to the respective directory.
Example:
    - You copy the relevant files from your device to the directory 
/usr/share/cross on your PC, preserving the directory structure.
    - Now you have directories such as /usr/share/cross/lib, 
/usr/share/cross/usr/lib, /usr/share/cross/usr/include etc.
    - Then you set gdb's sysroot variable to /usr/share/cross
    - gdb should now pick up the right libraries

  
Which commands do you send to gdb when manually debugging?> 
      
Nothing for now but Qt Creator sends a lot of commands and I don't know why
 and how to configure them.
    

Well, it must get the right sysroot from somewhere. Perhaps it has been set up 
with the correct sysroot at configure time? You can check that by starting gdb 
and typing "show sysroot".

  
2 - What is the purpose of gdb startup file and gdbserver startup file ?
What is the syntax ?
        
It's an sh script intended for doing preparations on the server side, like
copying your program or starting gdbserver. See the email you referenced
 above for an example.
      
Ok, I will try it when other points will be ok. Even with a embedded linux
 on my target, I will be able to copy and lanch gdbserver automatically ?
    

Yes, scp/ssh can do that.


Christian

  
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