Difference between libQt5Gui.so.5 + Linux

[stretchthebits]

Hello,
I am on Linux, more specifically Kubuntu.
The OS comes with Qt .SO files preinstalled.
For example, libQt5Gui.so.5.

I installed Qt Creator with
sudo ./qt-unified-linux-x64-3.1.1-online.run

and I chose Qt 5.9.9 and Qt 5.12.2.
nm shows something interesting.

nm --with-symbol-versions -D /opt/Qt/5.9.9/gcc_64/lib/libQt5Gui.so.5 | grep __cxa_throw_bad_array_new_length
Gives:
00000000004aa800 T __cxa_throw_bad_array_new_length@@Qt_5@@Qt_5

nm --with-symbol-versions -D /opt/Qt/5.12.2/gcc_64/lib/libQt5Gui.so.5 | grep __cxa_throw_bad_array_new_length
Gives:
000000000050f0d0 T __cxa_throw_bad_array_new_length@@Qt_5@@Qt_5

nm --with-symbol-versions -D /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5 | grep __cxa_throw_bad_array_new_length
Gives:
nothing

Why is __cxa_throw_bad_array_new_length exported by the libQt5Gui.so.5 that comes with Qt Creator but the libQt5Gui.so.5 that comes with Kubuntu does not have it?
The same applies to OpenSuse.

A guy at linuxquestions said,
if it does export it, find out if it accidental or intentional.

[SGaist]

Hi,

The most likely is that your distribution does not use the same flags to build Qt than the one from the pre-built packages.