Is there a possibility to see the spawned command for gcc, issued by cb?
You can look in the "build log" tab of the message window. But i do not think that there is something logged. This message tells us that your compiler command is empty.
You ar right - ther is no useful information.
Can you try to rename your config file to something else and restart codeblocks? It should be located in your home folder in the sub folder .codeblocks and named default.conf (i do not remember where it is located on linux, it can also be in .config folder...)
Thats it, you solved it :-) Thank you very much.
The file is located under ~/.config/codeblocks
avr gcc is working with exactly this installation?
Yes, since years w/o problems.