comejv commented on issue #16689:
URL: https://github.com/apache/nuttx/issues/16689#issuecomment-3049736926
Regarding out of tree building I see no mentions of CMake, is CMake a recent
addition to NuttX?
What I chose to do was a symlink to nuttx-apps/external using a cmake file
on which the main target depends:
```cmake
# cmake/symlink_apps.cmake
# This script creates a symbolic link for the main 'apps' directory into the
nuttx-apps 'external' directory.
# Define source and destination directories relative to the project root
set(APPS_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/nuttx-apps")
set(NUTTX_APPS_DEST_DIR "${CMAKE_CURRENT_SOURCE_DIR}/external/nuttx-apps")
# Define the destination for the symlink
set(SYMLINK_DESTINATION "${NUTTX_APPS_DEST_DIR}/external")
# Remove existing symlink or directory in the destination
if(EXISTS "${SYMLINK_DESTINATION}")
message(STATUS "Removing existing ${SYMLINK_DESTINATION}")
file(REMOVE_RECURSE "${SYMLINK_DESTINATION}")
endif()
# Calculate the relative path for the symlink to use relative paths
file(RELATIVE_PATH RELATIVE_APPS_PATH "${NUTTX_APPS_DEST_DIR}"
"${APPS_SOURCE_DIR}")
# Create symbolic link from nuttx-apps/external to the main apps directory
execute_process(
COMMAND ${CMAKE_COMMAND} -E create_symlink
"${RELATIVE_APPS_PATH}"
"${SYMLINK_DESTINATION}"
RESULT_VARIABLE SYMLINK_RESULT
OUTPUT_VARIABLE SYMLINK_OUTPUT
ERROR_VARIABLE SYMLINK_ERROR
)
if(NOT SYMLINK_RESULT EQUAL 0)
message(FATAL_ERROR "Failed to create symlink for apps directory:
${SYMLINK_ERROR}")
else()
message(STATUS "Created symlink: ${SYMLINK_DESTINATION} ->
${RELATIVE_APPS_PATH}")
endif()
```
I don't remember where I learned about nuttx-apps/external but not in the
docs you mentioned.
For anyone wondering if using cmake you do no need a Makefile or Make.defs,
only a CMakeLists at the root of external and one in each project:
```cmake
# external/CMakeLists.txt
nuttx_add_subdirectory()
nuttx_generate_kconfig(MENUDESC "*** Custom Firmware Applications ***")
```
```cmake
# external/hello/CMakeLists.txt
if(CONFIG_EXTERNAL_HELLO)
nuttx_add_application(
NAME
hello
SRCS
hello_main.c
STACKSIZE
1024
PRIORITY
100
endif()
```
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