trns1997 commented on PR #16970:
URL: https://github.com/apache/nuttx/pull/16970#issuecomment-3258700291
@leducp if you use this `toolchain.cmake` the app should build:
```
set(CMAKE_SYSTEM_NAME Generic)
set(CMAKE_SYSTEM_VERSION 1)
set(NUTTX 1)
set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
set(NUTTX_PATH ${CMAKE_CURRENT_LIST_DIR}/..)
include(${NUTTX_PATH}/scripts/target.cmake)
set(LINKER_SCRIPT ${NUTTX_PATH}/scripts/${LDNAME})
set(CMAKE_C_FLAGS "${ARCHCPUFLAGS} ${ARCHCFLAGS} -D__NuttX__")
set(CMAKE_CXX_FLAGS "${ARCHCPUFLAGS} ${ARCHCXXFLAGS} -D__NuttX__")
set(CMAKE_C_STANDARD_INCLUDE_DIRECTORIES ${NUTTX_PATH}/include
${NUTTX_PATH}/arch/chip)
set(CMAKE_CXX_STANDARD_INCLUDE_DIRECTORIES
${NUTTX_PATH}/include/${NUTTX_CXX} ${NUTTX_PATH}/include
${NUTTX_PATH}/arch/chip)
# Use only crt0.o, not every .o in startup/
set(STARTUP_OBJ ${NUTTX_PATH}/startup/crt0.o)
add_compile_options(-nostdlib)
add_compile_options(-ffunction-sections -fdata-sections)
# same entry used for all build modes in crt0.c and arch/.../xxx_start.c
set(ENTRY_NAME "__start")
set(CMAKE_C_LINK_EXECUTABLE
"<CMAKE_LINKER> ${LDFLAGS} --entry=${ENTRY_NAME} -T${LINKER_SCRIPT}
<OBJECTS> ${STARTUP_OBJS} -o <TARGET> <LINK_LIBRARIES> -L${NUTTX_PATH}/libs
--start-group ${LDLIBS} ${EXTRA_LIBS} --end-group"
)
set(CMAKE_CXX_LINK_EXECUTABLE
"<CMAKE_LINKER> ${LDFLAGS} --entry=${ENTRY_NAME} -T${LINKER_SCRIPT}
<OBJECTS> ${STARTUP_OBJS} -o <TARGET> <LINK_LIBRARIES> -L${NUTTX_PATH}/libs
--start-group ${LDLIBS} ${EXTRA_LIBS} --end-group"
)
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
```
relates to this comment
https://github.com/apache/nuttx/pull/16976#issuecomment-3258692508
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