[gn] add cli_uart (#12345)

This commit adds the `cli_uart` for applications to integrate OpenThread
CLI based on UART APIs. One of the example is OTNS.

examples/apps/cli/BUILD.gn

@@ -0,0 +1,35 @@
+#  Copyright (c) 2026, The OpenThread Authors.
+#  All rights reserved.
+#
+#  Redistribution and use in source and binary forms, with or without
+#  modification, are permitted provided that the following conditions are met:
+#  1. Redistributions of source code must retain the above copyright
+#     notice, this list of conditions and the following disclaimer.
+#  2. Redistributions in binary form must reproduce the above copyright
+#     notice, this list of conditions and the following disclaimer in the
+#     documentation and/or other materials provided with the distribution.
+#  3. Neither the name of the copyright holder nor the
+#     names of its contributors may be used to endorse or promote products
+#     derived from this software without specific prior written permission.
+#
+#  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+#  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+#  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+#  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+#  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+#  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+#  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+#  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+#  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+#  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+#  POSSIBILITY OF SUCH DAMAGE.
+#
+
+static_library("cli_uart") {
+  sources = [ "cli_uart.cpp" ]
+  include_dirs = [ "../../platforms" ]
+  deps = [
+    "../../../src/cli:cli_config",
+    "../../../src/core:libopenthread_core_headers",
+  ]
+}

examples/apps/cli/cli_uart.cpp

@@ -29,9 +29,7 @@
 
 #include <stdarg.h>
 #include <stdio.h>
-#include <string.h>
 
-#include <openthread-system.h>
 #include <openthread/cli.h>
 #include <openthread/logging.h>
 #include <openthread/platform/debug_uart.h>
@@ -291,6 +289,9 @@ static int Output(const char *aBuf, uint16_t aBufLength)
     return sent;
 }
 
+static int CliUartOutput(void *aContext, const char *aFormat, va_list aArguments)
+    OT_TOOL_PRINTF_STYLE_FORMAT_ARG_CHECK(2, 0);
+
 static int CliUartOutput(void *aContext, const char *aFormat, va_list aArguments)
 {
     OT_UNUSED_VARIABLE(aContext);

src/cli/BUILD.gn

@@ -42,7 +42,6 @@ openthread_cli_sources = [
   "cli_coap_secure.hpp",
   "cli_commissioner.cpp",
   "cli_commissioner.hpp",
-  "cli_config.h",
   "cli_dataset.cpp",
   "cli_dataset.hpp",
   "cli_dns.cpp",
@@ -76,20 +75,25 @@ openthread_cli_sources = [
   "x509_cert_key.hpp",
 ]
 
-config("cli_config") {
-  defines = []
+static_library("cli_config") {
+  public = [ "cli_config.h" ]
+  deps = [ "../../src/core:libopenthread_core_headers" ]
 }
 
 static_library("libopenthread-cli-ftd") {
   sources = openthread_cli_sources
-  public_deps = [ "../core:libopenthread-ftd" ]
-  public_configs = [":cli_config"]
+  public_deps = [
+    ":cli_config",
+    "../core:libopenthread-ftd",
+  ]
   visibility = [ "../../*" ]
 }
 
 static_library("libopenthread-cli-mtd") {
   sources = openthread_cli_sources
-  public_deps = [ "../core:libopenthread-mtd" ]
-  public_configs = [":cli_config"]
+  public_deps = [
+    ":cli_config",
+    "../core:libopenthread-mtd",
+  ]
   visibility = [ "../../*" ]
 }