[Solved] I don't use my custom build Qt

moravas · wrote on 2 Jun 2013, 19:56

Update:
I use different compiler to compile Qt framework and to my project. If I compile those with same compiler, the problem doesn't occurs longer.

Hi People,

My problem is the following:

I have an ARM Cortex A8 based embedded device.
On this device would like I run an custom Qt application.
I build the Qt 5.0.2 framework from source for those.

Everything is OK during the building, but I don't can compile my fist test application which uses a simple QVector instance, like this:

@
int main()
{
QVector<int> v;
return 0;
}
@

I got the following error from the linker:
@
g++ -Wl,-O1 -Wl,-rpath,/home/<path>/bin/lib -o masterController main.o -L/home/<path>/bin/lib -lQt5Core -lpthread
main.o: In function main': /home/<path>/masterController/../../../../<path>/include/QtCore/qvector.h:76: undefined reference to QArrayData::deallocate(QArrayData*, unsigned long, unsigned long)'
collect2: ld returned 1 exit status
@
This messages says that the linker doesn't found any "deallocate" method which accept two unsigned long parameter. I list the libQt5Core.so lib with the following command:
@
readelf -Ws libQt5Core.so | grep deallocate | c++filt
@

and got this:
@
3219: 0006dfed 20 FUNC GLOBAL DEFAULT 12 QArrayData::deallocate(QArrayData*, unsigned int, unsigned int)
@

So I have "deallocate" method, but at compile time the parameters are identify as unsigned int -s but the linker looking for unsigned long-s.

I don't any idea how can I fix this bug. Have anybody some tip?

Regards,
Norbert

SGaist · wrote on 2 Jun 2013, 20:32

Hi,

Are you sure you are using the cross-compiler ? g++ is generally the compiler installed on your system. You should rather have something like arm-linux-something-g++ while compiling for your target.

moravas · wrote on 3 Jun 2013, 04:50

Hi,

I don't use the traditional meaning cross compilation. The board has 1GHz CPU and 1GB RAM so I decided that it is able to compile the full Qt framework itself.
What you see in the logs as "g++" is the output from the ssh console of embedded board.

Regards,
Norbert

SGaist · wrote on 3 Jun 2013, 19:59

Ok, so your compiling everything directly on your target.

Your paths look strange to me. Did you install your Qt 5 build properly ?

moravas · wrote on 4 Jun 2013, 04:42

Hi,

my path looks out in the first post:
"/home/<path>/bin/lib"
because I don't would like displaying the full length of path, but the original path looks like this:
"/home/moravas/project/thesisOfMSC/cubie/bin/lib"

Regards,
Norbert

SGaist · wrote on 4 Jun 2013, 08:48

That doesn't answer my first question:

Did you compile and install Qt 5 properly on your target ?

moravas · wrote on 4 Jun 2013, 09:08

yes, I ran configure, make, make check and make install.
For configure I specified the install path, c++11 support, and -no-pch.

Regards,
Norbert

moravas · wrote on 11 Jun 2013, 06:27

Hi,

some update: I am looking for some error on the internet and I found the following two bug reports:
https://codereview.qt-project.org/#change,32868
https://codereview.qt-project.org/#change,33493

They have same error messages and the status of ticket is closed and solved, but I don't understand where I can reach the solution (branch, Qt release, tag, etc...)

Can anybody help me? :(

Thank you
Regards,
Norbert