doc: Mention macOS wcwidth bug

[Bruno Haible]

macOS 12.5 has a broken wcwidth(), like NetBSD.


2023-05-04  Bruno Haible  <bruno@clisp.org>

        doc: Mention macOS wcwidth bug.
        * m4/wcwidth.m4 (gl_FUNC_WCWIDTH): Mention macOS bugs.
        * doc/posix-functions/wcwidth.texi: Update regarding macOS.

diff --git a/doc/posix-functions/wcwidth.texi b/doc/posix-functions/wcwidth.texi
index 0540bb67a1..b68cb78015 100644
--- a/doc/posix-functions/wcwidth.texi
+++ b/doc/posix-functions/wcwidth.texi
@@ -17,7 +17,7 @@
 @item
 This function handles combining characters in UTF-8 locales incorrectly on some
 platforms:
-NetBSD 9.0, OpenBSD 5.8, MidnightBSD 1.1.
+macOS 12.5, NetBSD 9.0, OpenBSD 5.8, MidnightBSD 1.1.
 @item
 This function returns 2 for characters with ambiguous east asian width, even in
 Western locales, on some platforms:
diff --git a/m4/wcwidth.m4 b/m4/wcwidth.m4
index 93a7fa329c..e7829e98c8 100644
--- a/m4/wcwidth.m4
+++ b/m4/wcwidth.m4
@@ -1,4 +1,4 @@
-# wcwidth.m4 serial 35
+# wcwidth.m4 serial 36
 dnl Copyright (C) 2006-2023 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -41,9 +41,9 @@ AC_DEFUN([gl_FUNC_WCWIDTH]
   if test $ac_cv_func_wcwidth = yes || test $gl_cv_func_wcwidth_macro = yes; 
then
     HAVE_WCWIDTH=1
     dnl On Mac OS X 10.3, wcwidth(0x0301) (COMBINING ACUTE ACCENT) returns 1.
-    dnl On NetBSD 9.0, OpenBSD 5.0, MidnightBSD 1.1,
+    dnl On macOS 12.5, NetBSD 9.0, OpenBSD 5.0, MidnightBSD 1.1,
     dnl wcwidth(0x05B0) (HEBREW POINT SHEVA) returns 1.
-    dnl On NetBSD 9.0, MidnightBSD 1.1, OSF/1 5.1,
+    dnl On macOS 12.5, NetBSD 9.0, MidnightBSD 1.1, OSF/1 5.1,
     dnl wcwidth(0x200B) (ZERO WIDTH SPACE) returns 1.
     dnl On OpenBSD 5.8, wcwidth(0xFF1A) (FULLWIDTH COLON) returns 0.
     dnl This leads to bugs in 'ls' (coreutils).