Emacs gud not working on new installation

Ken Brown kbrown@cornell.edu
Wed Mar 4 15:59:00 GMT 2020

On 3/4/2020 9:44 AM, William M. (Mike) Miller wrote:
> I installed Cygwin on a new computer last weekend. On my previous computer,
> I used gud with gdb in emacs (M-x gdb) for debugging. However, on the new
> computer it is not working. I suspect that gdb is producing output that is
> not formatted correctly for gud to parse.
> When I start gud in emacs on the new computer, I get the usual 6-pane
> configuration, and gdb puts out its usual configuration and start-up
> information. When I type the "run" command, however, the program being
> debugged starts and runs, the command pane correctly displays the usual
> "Starting program" messaged, but the "[New thread...", etc. messages and
> any further gdb output (breakpoint messages, output of "info", etc.) do
> not. The program input/output pane updates, but none of the others do. I
> can type commands that are correctly passed through to gdb, but no gdb
> output ever appears in the command pane.
> I also tried just the plain "M-x gud-gdb" interface, and that may give a
> hint as to what is going on. I did get the gdb output, but with only
> newlines, no carriage returns, in the command pane. That is, each
> successive line of output from gdb began one character to the right of the
> last character of the previous line instead of beginning in column 0, as it
> did on the old computer.
> Any suggestions for how to diagnose or fix the problem would be most
> appreciated.

I don't know whether this is an emacs problem or a Cygwin problem.  Here 
are two things you can try:

1. Roll back the cygwin package to 3.0.7 to see if that fixes the 
problem.  If so, the problem is likely related to the pty changes in 

2. Try updating emacs to the test release for the upcoming emacs-27, 
which I will be uploading shortly.


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