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Message-ID: <a9676834-0368-4a8a-88b0-da5e9483b536@towo.net>
Date: Sun, 12 Apr 2026 13:25:07 +0200
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To: cygwin AT cygwin DOT com
Subject: wcwidth broken with gcc 16
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From: Thomas Wolff via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Thomas Wolff <towo AT towo DOT net>
Sender: "Cygwin" <cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com>

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Observed with gcc 16:
For a number of character ranges, mainly (but not only) from CJK ranges,=
=20
wcwidth incorrectly reports width 1 instead of 2, 0, or -1.
Test file attached.
I am puzzled as I see no cause of this behaviour, no define or typedef=20
that might divert from newlib/libc wcwidth, and that would clearly=20
deliver the proper values.
Thomas

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