[QtC 3.5.0] Unable to debug with CentOS/RHEL 6 also with the prebuilt binary packages

It's not possible to debug with CentOS 6/ RHEL 6.6 even with the prebuilt binary packages we provide. It seems that the gdb coming with devtoolset-3 is too old (version 7.2) and it also has too old python (2.6).

The debugger fails to start with:

 >&"Traceback (most recent call last):\n"
>&"  File \"<string>\", line 1, in <module>\n"
>&"  File \"/home/user/Qt5.5.0/Tools/QtCreator/share/qtcreator/debugger/gdbbridge.py\", line 20, in <module>\n"
>&"    from dumper import *\n"
>&"  File \"/home/user/Qt5.5.0/Tools/QtCreator/share/qtcreator/debugger/dumper.py\", line 37, in <module>\n"
>&"    import importlib\n"
>&"ImportError: No module named importlib\n"
>&"Error while executing Python code.\n"
>14^error,msg="Error while executing Python code." 

As a workaround one would need to update the toolchain.
Here are the steps to make it working:

• yum install ncurses-devel
• yum install python27-python-devel
• wget ftp://sourceware.org/pub/gdb/releases/gdb-7.7.tar.gz
• tar xfvz gdb-7.7.tar.gz
• cd gdb-7.7
• export LIBS=-L/opt/rh/python27/root/usr/lib64/
• ./configure --prefix=/home/user/gdb-install --with-python=/opt/rh/python27/root/usr/bin/python2.7
• make
• make install
• in Qt Creator 3.5.0: add /home/user/gdb-install/bin/gdb as the new debugger
• create/augment kit with that debugger