[cygwin] Issue on output when using javac or scalac under emacs

[Takashi Yano]

On Wed, 26 Aug 2020 08:31:35 +0200
Luc Henninger wrote:
> Le 26/08/2020 à 01:19, Jason Pyeron a écrit :
> >> -----Original Message-----
> >> From: Luc Henninger
> >> Sent: Tuesday, August 25, 2020 6:40 PM
> >>
> > I'm thick - what the issue? There was no body to the email.
> >
> >
> Hello,
> 
> ( My previous message dos not contain the text, only the attachments!!! )
> 
> For years, I use emacs-nt (the one provided by gnu.org) under cygwin. I 
> just discover that emacs is also directly provided by cygwin (late is 
> better than never :-)). So I try to use it successfully up to a 
> compilation error in one of my program in java.
> 
> To compile java (or scala), I use my own makefile that I start from emacs.
> 
> In case of error, I encountered a strange output undex emacs_w32 and 
> emacs_nox compared to emacs_nt (see trace_nox, trace_w32 and trace_nt in 
> attachment).

I'm not sure what you meant by emacs_w32, but if you start make by
M-x compile, I guess
env CYGWIN=disable_pcon emacs
will solve the issue.

> I currently use emacs release 27.1 for all emacses, but I verify that I 
> have the same strange behaviour with emacs 26.3.
> 
> Can anybody explain this? and more gane give a workaround?

Cygwin 3.1.x and later enables pseudo console for non-cygwin apps.
Pseudo console generates some ANSI escape sequences if non-cygwin
apps are executed. However, emacs provides dumb terminal for M-x
compile, M-x shell or M-x eshell. As a result, the problem occurs.

CYGWIN=disable_pcon disables pseudo console, so it will resolve
the issue.

-- 
Takashi Yano <takashi.yano@nifty.ne.jp>