QT 5.15.0 install :

[dahu74fr]

@hskoglund Yes. It works.
For information, i downloaded Mingw 8.10 64 bits. I install it and compare the two directories. The one in Qt and the one i installed. Every thing is the same.

An other step i tried : i have CodeBlocks installed on my computer. I try to launch the gdb32.exe in the directory of codeblocks and it works. (Third screenshot).

Error launching DebugView :

[hskoglund]

I see, it might be the MinGW versions in CodeBlocks and Qt are fighting each other.
So try launch another CMD window, this time click on the start button and type mingw then select this CMD:

Note that it's called 7.3.9 but that's a typo, when you click on it it should show:

In this CMD window type

gdb

[dahu74fr]

@hskoglund Here is what i have :

and the result :

[hskoglund]

Ok, looks good. try typing gdb in that CMD

[dahu74fr]

@hskoglund Nothing more :

I omited to tell you that i also tried to reinstall Qt in the path by default "C:\Qt" after a full uninstall (with deleting "C:\Users\Administrateur PC\AppData\Roaming\QtProject", thinking that it was a Path issue. But i had the same result.

[hskoglund]

Ok, but you have still have a Qt installed at C:\Programmation, right?

In that same CMD window, try again with gdb but first type:

set path=C:\Programmation\Qt\Tools\mingw810_64\bin
gdb

[dahu74fr]

@hskoglund
It doesn't works.
But it's normal because gdb.exe is not in the directory : "C:\Programmation\Qt\Tools\mingw810_64\bin".
It is in : "C:\Programmation\Qt\Tools\mingw810_64\bin". So i tried also.
Perhaps an issue of Path in the Qt configuration ! But i don't think so because it can launch G++.exe.

[hskoglund]

Yeah, sorry I meant C:\Programmation\Qt\Tools\mingw810_64\bin.
Also, try this in the same CMD window as above:
gdborig

[dahu74fr]

@hskoglund I tried in my previous post. Here was the result :

[hskoglund]

You mean typing gdborig also returns nothing?

[dahu74fr]

@hskoglund Yes i have an error message :

[hskoglund]

The error message is correct, but could also check that MinGW's python works, try type:

C:\Programmation\Qt\Tools\mingw810_64\opt\bin\python

[dahu74fr]

@hskoglund said in QT 5.15.0 install ::

C:\Programmation\Qt\Tools\mingw810_64\opt\bin\python
I have also Python installed on my computer. The V3.8.3.
Here the result :

[hskoglund]

Hmm, tricky :-) one more, in the same CMD try:

C:\Programmation\Qt\Tools\mingw810_64\opt\bin\gdbmtool.exe

[dahu74fr]

@hskoglund
I have also Python installed on my computer. The V3.8.3.
Result :

[hskoglund]

Sure, but your V3.8.3 I think should not bother MinGW's version of python.
One more check: in that same CMD, type:

set path=C:\Programmation\Qt\Tools\mingw810_64\bin;C:\Programmation\Qt\Tools\mingw810_64\opt\bin
gdborig

[dahu74fr]

@hskoglund said in QT 5.15.0 install ::

set path=C:\Programmation\Qt\Tools\mingw810_64\bin;C:\Programmation\Qt\Tools\mingw810_64\opt\bin

[hskoglund]

Hmm, you could be right, that your installed Python V3.8.3 is bullying MinGW's python 2.7, because on my Windows 10 without any Python 3.8.3 installed, when I set the path set path=C:\Qt\Tools\mingw810_64\bin;C:\Qt\Tools\mingw810_64\opt\bin and type gdborig this shows:

[hskoglund]

Ok, to try workaround the fighting of the Pythons, in that same CMD window, type;

set PYTHONHOME=C:\Programmation\Qt\Tools\mingw810_64\opt

then try both

gdborig

and

gdb

[dahu74fr]

@hskoglund
For information, before launching what you wrote, i have uninstalled Python 3.8.3, also a Python 2.7.4 used by a software and uninstalled Qt with RevoUninstaller.
Then i rebooted and made a cleanup of the registry with CCleaner.
I reinstalled Qt, but i have the same result in Debugger in Options.
And same result with what you wrote.

The result for gdborig :

And for gdb :