Error when trying to attach GDB to project

[alex1]

Getting this error when I try to attach the debugger to a C++ project - "The selected build of GDB supports Python scripting, but the used version 0.0 is not sufficient for Qt Creator. Supported versions are Python 2.7 and 3.x."

I have python 2.x and 3.x installed already. Running on Fedora 29.
Qt Creator version - 4.11.2.
GDB version - Fedora 8.2-3.fc29
gcc version - 8.3.1 20190223

[Pablo J. Rogina]

@alex1 that error comes from method GdbEngine::handlePythonSetup in Qt Creator source code.

You may want to check why your GDB setup reports Python version as 0.0 back to Qt Creator

 GdbMi data = response.data;
        watchHandler()->addDumpers(data["dumpers"]);
        m_pythonVersion = data["python"].toInt();
        if (m_pythonVersion < 20700) {
            int pythonMajor = m_pythonVersion / 10000;
            int pythonMinor = (m_pythonVersion / 100) % 100;

You may find more information about Qt Creator and GDB interaction here.

Additionally, you may want to contact the Qt Creator mailing list

[alex1]

Thanks for the info.

I don't know how to check why GDB setup reports python version as 0.0, I don't really have the skill level to dig into the Qt Creator source code and find out how it works. I did find this link for a bug report that was filed from someone a few years ago. Seems releated. No actionable info in there for me to solve my problem though.
https://bugreports.qt.io/browse/QTCREATORBUG-17659?focusedCommentId=345304&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel

[mgrabner]

I came across the same issue and noticed that the reason was the line "set trace-commands on" in my "~/.gdbinit" file. This seems to modify the output of gdb such that parsing the python version number fails. Therefore I suggest:
*) Qt creator users should make sure that the "trace-commands" feature in gdb is disabled.
*) Qt creator developers should explicitly switch off the "trace-commands" feature after establishing the connection with gdb or modify the parser such that it can deal with the additional trace output.

Hope that helps (at least it does for me),
Markus