[newlib-cygwin] Cygwin: Document that the pipe_byte option is now set by default

[newlib-cygwin] Cygwin: Document that the pipe_byte option is now set by default

[Takashi Yano]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=451bbfb9f3313b9645f19e9df62e2c508f701759

commit 451bbfb9f3313b9645f19e9df62e2c508f701759
Author: Ken Brown <kbrown@cornell.edu>
Date:   Thu Nov 11 11:01:11 2021 -0500

    Cygwin: Document that the pipe_byte option is now set by default

Diff:
---
 winsup/cygwin/release/3.4.0 | 4 ++++
 winsup/doc/cygwinenv.xml    | 5 +++--
 winsup/doc/new-features.xml | 5 +++++
 3 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/winsup/cygwin/release/3.4.0 b/winsup/cygwin/release/3.4.0
index 51ff4e0d5..b4a1267a4 100644
--- a/winsup/cygwin/release/3.4.0
+++ b/winsup/cygwin/release/3.4.0
@@ -9,6 +9,10 @@ What's new:
 What changed:
 -------------
 
+- The CYGWIN=pipe_byte option is now set by default, so that pipes are
+  opened in byte mode rather than message mode.
+  Addresses: https://cygwin.com/pipermail/cygwin/2021-March/247987.html
+
 
 Bug Fixes
 ---------
diff --git a/winsup/doc/cygwinenv.xml b/winsup/doc/cygwinenv.xml
index 649084dfa..5e17404a7 100644
--- a/winsup/doc/cygwinenv.xml
+++ b/winsup/doc/cygwinenv.xml
@@ -51,8 +51,9 @@ If supplied, wildcard matching is case insensitive.  The default is <literal>noi
 </listitem>
 
 <listitem>
-<para><envar>(no)pipe_byte</envar> - causes Cygwin to open pipes in byte mode rather than
-message mode.</para>
+<para><envar>(no)pipe_byte</envar> - if set, Cygwin opens pipes in byte mode rather than
+message mode.  This is the default starting with Cygwin 3.4.0.
+</para>
 </listitem>
 
 <listitem>
diff --git a/winsup/doc/new-features.xml b/winsup/doc/new-features.xml
index 4fdfafc24..13d69ca9d 100644
--- a/winsup/doc/new-features.xml
+++ b/winsup/doc/new-features.xml
@@ -16,6 +16,11 @@ Drop support for Vista and Server 2008.
 Add code to handle setrlimit(RLIMIT_AS).
 </para></listitem>
 
+<listitem><para>
+The CYGWIN=pipe_byte option is now set by default, so that pipes are
+opened in byte mode rather than message mode.
+</para></listitem>
+
 </itemizedlist>
 
 </sect2>