-var-create: unable to create variable object

[jyhur]

Hello.

My project is a large cmake project for Android. Build output(.so) is about 2GB. (and 20MB if stripped)
I built it on linux(ndk r10, gcc4.8) and copied stripped “.so” to Windows and made APK on Windows.

I ran it using “Quick Debug” with below options,
– “Debug code that executes during App startup”
– “Disable -file-list-exec-source-files”
– arm-linux-androideabi-4.6 (ndk r10)

I could set a breakpoint and when it breaked, callstacks and threads were shown perfectly.
But any variables couldn’t be examined. GDB outputs were like this.

-var-create --frame 0 --thread 1 - * "this"
&"warning: (Internal error: pc 0x51250000 in read in psymtab, but not in symtab.)n"
&"n"
-var-create: unable to create variable object

BTW, VisualGDB is awesome!! 😀

[jyhur]

I found the reason.
The versions of toolchain, that are used for building and debugging, should be same.
In my case, I built my project with GCC-4.8 and tried to debug with GCC-4.6. That was the problem.

[support]

Hi,

The root cause for this message is incompatibility between the debug information issued by GCC and read by GDB. If you encounter it again, try experimenting with the -gdwarf- GCC flag.

[jyhur]

I succeeded debugging by adding “-gdwarf-2” gcc flag.
Now I can build with GCC4.8 and debug with GCC4.6.
Thank you for your help. 😀

[Anonymous]

@bazis wrote:

Hi,

The root cause for this message is incompatibility between the debug information issued by GCC and read by GDB. If you encounter it again, try experimenting with the -gdwarf- GCC flag.

hi,brother
thanks very much
It’s was useful when i debug with gcc
but when i try to debug with g++
it still tell me “-var-create: unable to create variable object”

[Anonymous]

@wks wrote:

@bazis wrote:

Hi,

The root cause for this message is incompatibility between the debug information issued by GCC and read by GDB. If you encounter it again, try experimenting with the -gdwarf- GCC flag.

hi,brother
thanks very much
It’s was useful when i debug with gcc
but when i try to debug with g++
it still tell me “-var-create: unable to create variable object”

i have aleady solves it.with these command:

dpkg -l |grep ii | grep gcc
dpkg -l |grep ii | grep g++
sudo rm /usr/bin/gcc
sudo rm /usr/bin/g++
sudo ln -s /usr/bin/gcc-4.6 /usr/bin/gcc
sudo ln -s /usr/bin/g++-4.6 /usr/bin/g++

and now,we don’t need the “-gdwarf-2”
my os is ubuntu 14.04. i had update my gcc and g++ to 4.8 .
now i choice to use 4.6.
my first language is not english… I hope the information can help others. =_=

[bmcdonnell_psi]

For any future readers, I recently got this error, but not for that reason. I had

uint32_t buffer[32];

uint8_t *pBuf = (uint8_t *)buffer;

I got the error when I put pBuf,128 in the Watch window, having forgotten that it’s just a pointer, not the actual array. So I watched buffer instead.

[Author]

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