Description of problem: When doing "Run tests" in the config tool v2 on linux, each line ends with a square box. I guess this is some sort of carriage return character hangover from windows, which is then displayed as a box in the font that wxgtk happens to use.
The CR characters appear to originate from gdb itself. I have worked around this issue by stripping CRs for non-Windows hosts in ecRunTestsDialog::TestOutputCallback().