add initial cmake build system

Co-authored-by: Daniel Agar <daniel@agar.ca>
Signed-off-by: chao an <anchao@xiaomi.com>

builtin/CMakeLists.txt

@@ -0,0 +1,59 @@
+# ##############################################################################
+# apps/builtin/CMakeLists.txt
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more contributor
+# license agreements.  See the NOTICE file distributed with this work for
+# additional information regarding copyright ownership.  The ASF licenses this
+# file to you under the Apache License, Version 2.0 (the "License"); you may not
+# use this file 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.
+#
+# ##############################################################################
+
+if(CONFIG_BUILTIN)
+
+  include_directories(${CMAKE_CURRENT_BINARY_DIR})
+
+  # generate registry
+  get_property(nuttx_app_libs GLOBAL PROPERTY NUTTX_APPS_LIBRARIES)
+  set(builtin_list_string)
+  set(builtin_proto_string)
+  foreach(module ${nuttx_app_libs})
+
+    # builtin_list.h Example: { "hello", SCHED_PRIORITY_DEFAULT, 2048,
+    # hello_main },
+    #
+    get_target_property(APP_MAIN ${module} APP_MAIN)
+    get_target_property(APP_NAME ${module} APP_NAME)
+    get_target_property(APP_PRIORITY ${module} APP_PRIORITY)
+    get_target_property(APP_STACK ${module} APP_STACK)
+    set(builtin_list_string
+        "${builtin_list_string}\{ \"${APP_NAME}\", ${APP_PRIORITY}, ${APP_STACK}, ${APP_MAIN} \},  \n"
+    )
+
+    # builtin_proto.h Example: int hello_main(int argc, char *argv[]);
+    set(builtin_proto_string
+        "${builtin_proto_string}int ${APP_MAIN}(int argc, char *argv[]);\n")
+
+  endforeach()
+
+  configure_file(builtin_proto.h.in builtin_proto.h)
+  configure_file(builtin_list.h.in builtin_list.h)
+
+  set(CSRCS)
+
+  list(APPEND CSRCS builtin_list.c exec_builtin.c builtin_list.h
+       builtin_proto.h)
+
+  # target_sources(apps PRIVATE ${CSRCS})
+  nuttx_add_library(apps_builtin ${CSRCS})
+
+endif()

builtin/builtin_list.h.in

@@ -0,0 +1 @@
+${builtin_list_string}

builtin/builtin_proto.h.in

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+${builtin_proto_string}