Example gn flow

examples/lighting-app/silabs/BUILD.gn

@@ -44,6 +44,25 @@ if (wifi_soc) {
 
 import("${examples_common_plat_dir}/args.gni")
 
+# CustomAppTask: copy .cpp and .h from platform into build directory
+_custom_app_task_gen_dir = "${root_build_dir}/config"
+action("ensure_custom_app_task") {
+  script = "${examples_common_plat_dir}/ensure_local_custom_app_task.py"
+  args = [
+    rebase_path(examples_common_plat_dir, root_build_dir),
+    rebase_path(silabs_project_dir, root_build_dir),
+    rebase_path(root_build_dir, root_build_dir),
+  ]
+  inputs = [
+    "${examples_common_plat_dir}/CustomAppTask.cpp",
+    "${examples_common_plat_dir}/CustomAppTask.h",
+  ]
+  outputs = [
+    "${_custom_app_task_gen_dir}/CustomAppTask.cpp",
+    "${_custom_app_task_gen_dir}/CustomAppTask.h",
+  ]
+}
+
 declare_args() {
   # Dump memory usage at link time.
   chip_print_memory_usage = false
@@ -121,7 +140,10 @@ if (wifi_soc) {
 }
 silabs_executable("lighting_app") {
   output_name = "matter-silabs-lighting-example.out"
-  include_dirs = [ "include" ]
+  include_dirs = [
+    "include",
+    _custom_app_task_gen_dir,
+  ]
   defines = []
 
   if (silabs_board == "BRD2704A") {
@@ -131,11 +153,12 @@ silabs_executable("lighting_app") {
   sources = [
     "${examples_common_plat_dir}/main.cpp",
     "src/AppTask.cpp",
-    "src/CustomAppTask.cpp",
+    "${_custom_app_task_gen_dir}/CustomAppTask.cpp",
     "src/DataModelCallbacks.cpp",
   ]
 
   deps = [
+    ":ensure_custom_app_task",
     ":sdk",
     "${chip_root}/src/app/persistence:deferred",
     "${chip_root}/src/platform/logging:default",

examples/platform/silabs/ensure_local_custom_app_task.py

@@ -0,0 +1,57 @@
+#!/usr/bin/env python3
+#
+# Copyright (c) 2020 Project CHIP Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use it except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# Copies CustomAppTask.cpp and CustomAppTask.h from examples/platform/silabs/
+# into the build directory.
+
+import os
+import shutil
+import sys
+
+
+def main():
+    if len(sys.argv) < 4:
+        sys.stderr.write(
+            "usage: ensure_local_custom_app_task.py <platform_silabs_dir> <app_project_dir> <root_build_dir>\n"
+        )
+        sys.exit(1)
+
+    base = os.getcwd()
+    platform_dir = os.path.normpath(os.path.abspath(os.path.join(base, sys.argv[1])))
+    build_dir = os.path.normpath(os.path.abspath(os.path.join(base, sys.argv[3])))
+
+    template_cpp = os.path.join(platform_dir, "CustomAppTask.cpp")
+    template_h = os.path.join(platform_dir, "CustomAppTask.h")
+    build_config_dir = os.path.join(build_dir, "config")
+    dest_cpp = os.path.join(build_config_dir, "CustomAppTask.cpp")
+    dest_h = os.path.join(build_config_dir, "CustomAppTask.h")
+
+    for path in (template_cpp, template_h):
+        if not os.path.isfile(path):
+            sys.stderr.write("template not found: %s\n" % path)
+            sys.exit(1)
+
+    # Only copy when build dir does not have a copy
+    if os.path.isfile(dest_cpp):
+        return
+
+    os.makedirs(build_config_dir, exist_ok=True)
+    shutil.copy2(template_cpp, dest_cpp)
+    shutil.copy2(template_h, dest_h)
+
+
+if __name__ == "__main__":
+    main()