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Subject: Re: wcwidth broken with gcc 16
To: cygwin AT cygwin DOT com
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From: Doug Henderson via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Doug Henderson <djndnbvg AT gmail DOT com>
Sender: "Cygwin" <cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com>

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 On Tue, Jun 2, 2026 at 1:46=E2=80=AFAM Thomas Wolff via Cygwin <cygwin AT cyg=
win.com>
wrote:

Thomas Wolff, et. al.,

I have been carefully following this discussion of technical issues, API
conformance, and related issues,.

There has been no significant discussion of the user experience that
depends on the resolution of this problem.

Will non-BMP Unicode code points display correctly in terminal windows
(that use an appropriate font), e.g. mintty?

Non-BMP Unicode code points include emojis, mathematical script glyphs, and
many others.

For me, I care if a small Python script like:

$ type main.py
print("U+01D49E =E2=80=B9=F0=9D=92=9E=E2=80=BA  GC=3DLu    MATHEMATICAL SCR=
IPT CAPITAL C")

outputs:
U+01D49E =E2=80=B9=F0=9D=92=9E=E2=80=BA  GC=3DLu    MATHEMATICAL SCRIPT CAP=
ITAL C

on Windows Terminal, as expected

and when running cygwin in a mintty window:

$ uname -a
CYGWIN_NT-10.0-26200 mercury 3.6.9-1.x86_64 2026-04-21 15:46 UTC x86_64
Cygwin
$ mintty --version
mintty 3.8.2 (Cygwin-x86_64)
$ date
Jun  2, 2026 11:36:33
$ python3 -V
Python 3.12.12
$ cat main.py
print("U+01D49E =E2=80=B9=F0=9D=92=9E=E2=80=BA  GC=3DLu    MATHEMATICAL SCR=
IPT CAPITAL C")
$ python3 main.py
U+01D49E =E2=80=B9=F0=9D=92=9E=E2=80=BA  GC=3DLu    MATHEMATICAL SCRIPT CAP=
ITAL C

correctly displays the Mathematical Script Capital C glyph as seen in the
attached screen capture.

If the resolution of this problem changes "our" user experience, that will
be another problem.

As an after thought, I may be seeing success due to the byte stream
containing UTF-8 4-byte sequences all the way through Windows 11 APIs,
without any conversions to UTF-16 or UTF-32.

I am not so up-to-date with C as to rattle off a demo in seconds, as I can
in Python. I would like to see such a minimal C demo program that I can try
with cmd in WT, with MINGW64 in mintty, and with cygwin in mintty. The demo
should send UTF-8 4-byte, UTF-16 2-short, and UTF-32 1-long characters, if
possible. TIA.

Just my take,
Doug

-- Doug Henderson, Calgary, Alberta, Canada - from gmail.com

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