Junbo-Zheng opened a new pull request, #21743:
URL: https://github.com/apache/nuttx/pull/21743
## Summary
`nuttx_generate_preprocess_target` writes its dependency file next to
the preprocessed output (`-MF ${TARGET_FILE}.d`). For the ROMFS
staging targets that directory is packed verbatim by `genromfs`, so
every CMake-built configuration with `CONFIG_ETC_ROMFS` ships the
`.d` files in `/etc`:
```
nsh> ls /etc/init.d
/etc/init.d:
init.rc
init.rc.d <- a make dependency rule, shipped in the image
```
`sim:nsh` currently carries `init.rc.d` next to the real script.
The Make flow is not affected: its `PREPROCESS` macro does not
generate depfiles.
Generate the depfile under a `.deps/` directory instead, so the
staging directory only ever contains files meant for the image.
The `-MT` target and the dependency semantics are unchanged.
## Impact
- **Users**: CMake-built ROMFS images no longer contain stray `.d`
files under `/etc`.
- **Build**: depfile location only; incremental-build behavior is
unchanged. The other callers (linker-script preprocessing in the
top-level CMakeLists and libs/libc/elf) just get their depfiles in
the new location.
- **Hardware**: None.
- **Documentation**: None.
- **Security & Compatibility**: None.
## Testing
`sim:nsh` (CMake, Ubuntu 22.04):
```
cmake -B build -DBOARD_CONFIG=sim:nsh -G Ninja
cmake --build build -j
./build/nuttx
```
Before:
```
nsh> ls /etc/init.d
/etc/init.d:
init.rc
init.rc.d
```
After:
```
nsh> ls /etc/init.d
/etc/init.d:
init.rc
```
Signed-off-by: Junbo Zheng <[email protected]>
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