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Date: Fri, 5 Dec 2025 12:11:47 +0100
To: cygwin AT cygwin DOT com
Subject: Re: dynamic conpty loading
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From: Corinna Vinschen via Cygwin <cygwin AT cygwin DOT com>
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On Dec  5 18:52, Takashi Yano via Cygwin wrote:
> On Thu, 4 Dec 2025 12:01:58 +0100
> Corinna Vinschen wrote:
> > Aren't from here on two patches folded into one?  All but one hunk (the
> > one calling CreatePseudoConsole_new) seem to be entirely independent of
> > OpenConsole.
> 
> This part is necessary to work with OpenConsle.exe. OpenConsole.exe uses
> also ESC[c during startup while conhost.exe uses only ESC[6n.

Ok, but ESC[c is a stock vt100 sequence.  Admittedly, I have no idea if
there are other terminals out there which use this sequence at startup,
too...

> > > -      static const int wpbuf_len = strlen ("\033[32768;32868R");
> > > +      static const int wpbuf_len = 64; /* for response to CSI6n nad CSIc */
> > 
> > Is there some macro for the count of 64 in this context, by any chance?
> 
> I'm not sure for now that 64 is really enough for the responce to ESC[c.
> mintty returns about 30 byte responce. But some other terminal may return
> longer responce.

Per the vt100 documentation, the response is supposed to be

  ESC [ ? 1 ; Ps c

with Ps being a character in the range 0 - 7.

Just being curious, what are mintty and OpenConsole returning?

> > > [...]
> > > if [ $(uname -m) = "x86_64" ]
> > > then
> > > 	POSTFIX="x64"
> > > else
> > > 	POSTFIX="x86"
> > 
> > Do we really want a 32 bit version?  Isn't there an aarch64 version?
> 
> No.

Weird.  But Windows on AArch64 supports a x86_64 emulation, iiuc.

> What should we assume result of "uname -m" in aarch64 machine?

"aarch64" :)

> > For a start, this may be ok, but we should really try to build our own
> > OpenConsole package build by our own gcc or clang, IMHO.
> 
> OpenConsole.exe also uses WIL, so it looks not easy to build it in cygwin
> environment.
> 
> Maybe just getting it from https://github.com/microsoft/wil/ is enough,
> but I have not tried it yet.

Oh, wow!  Looks like fixes to build WIL on MingW have been merged just a
couple of hours ago.


Corinna

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