[ddc]: Deprecate public dartdevc scripts

Change-Id: I1fdb19e21b4d787090d98cd519e002efebac5e4b
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/229304
Reviewed-by: Nicholas Shahan <[email protected]>

Author: sigmundch

CHANGELOG.md

@@ -33,9 +33,16 @@
   marked deprecated as previously announced.
   Its replacement is the `dart compile js` command.
   Should you find any issues, or missing features, in the replacement
-  command, kindly file [an issue][].
+  command, kindly file [an issue](https://github.com/dart-lang/sdk/issues/new).
 
-[an issue]: https://github.com/dart-lang/sdk/issues/new
+- **Breaking Change** [#46100](https://github.com/dart-lang/sdk/issues/46100):
+  The standalone `dartdevc` tool has been marked deprecated as previously
+  announced and will be deleted in a future Dart stable relase.  This tool
+  was intended for use only by build systems like bazel, `build_web_compilers`
+  and `flutter_tools`. The functionality remains available for those systems,
+  but it is no longer exposed as a command-line tool in the SDK.
+  Please share any concerns in the 
+  [breaking change tracking issue](https://github.com/dart-lang/sdk/issues/46100).
 
 - **Breaking Change** [#46100](https://github.com/dart-lang/sdk/issues/46100):
   The standalone `dartdoc` tool has been removed as

sdk/bin/dartdevc_sdk

@@ -6,6 +6,9 @@
 # Run dev compiler on the Dart VM. This script assumes the Dart SDK's
 # directory structure.
 
+echo "Warning: this 'dartdevc' script is deprecated and will be removed. " 1>&2
+echo "More details at https://github.com/dart-lang/sdk/issues/46100." 1>&2
+
 function follow_links() {
   file="$1"
   while [ -h "$file" ]; do

sdk/bin/dartdevc_sdk.bat

@@ -3,6 +3,9 @@ REM Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 REM for details. All rights reserved. Use of this source code is governed by a
 REM BSD-style license that can be found in the LICENSE file.
 
+echo Warning: this 'dartdevc' script is deprecated and will be removed.  1>&2
+echo More details at https://github.com/dart-lang/sdk/issues/46100.      1>&2
+
 setlocal
 rem Handle the case where dart-sdk/bin has been symlinked to.
 set DIR_NAME_WITH_SLASH=%~dp0