toku-mac opened a new issue, #3473:
URL: https://github.com/apache/nuttx-apps/issues/3473
### Description / Steps to reproduce the issue
#### Description
When building a Rust crate using CMake with a specific target triple (e.g.,
`thumbv8m.main-nuttx-eabihf`), the linker fails to find the generated static
library (`lib<crate>.a`).
This is because `nuttx_add_rust.cmake` incorrectly constructs the build
directory path by appending the target triple to the `--target-dir` argument.
Since Cargo itself also appends the target triple to the directory specified by
`--target-dir`, it results in a nested directory structure like:
`.../target/<target-triple>/<target-triple>/debug/lib<crate>.a`
However, the CMake script expects the library to be at:
`.../target/<target-triple>/debug/lib<crate>.a`
#### Steps to Reproduce
1. Configure NuttX for a board that supports Rust (e.g.,
`nucleo-h563zi:nsh`).
2. Use CMake to build the project:
```bash
cmake -S . -B build-debug -DBOARD_CONFIG=nucleo-h563zi:nsh -GNinja
cmake --build build-debug -t olddefconfig
cmake --build build-debug -j 6
```
3. The build fails during the linking stage with an error similar to:
```
/path/to/arm-none-eabi/bin/ld: cannot find
apps/examples/rust/hello/hello/target/thumbv8m.main-nuttx-eabihf/debug/libhello.a:
No such file or directory
```
#### Expected Behavior
The Rust library should be correctly located by the linker, and the build
should complete successfully.
#### Actual Behavior
The linker fails because it looks for the library in the wrong location due
to the nested directory structure created by the incorrect `--target-dir` usage.
#### Proposed Fix
Modify `apps/cmake/nuttx_add_rust.cmake` to set `RUST_BUILD_DIR` without the
target triple and update `RUST_LIB_PATH` to include the target triple in the
expected location.
```cmake
# Before
set(RUST_BUILD_DIR
${CMAKE_CURRENT_BINARY_DIR}/${CRATE_NAME}/target/${TARGET_BASE})
set(RUST_LIB_PATH ${RUST_BUILD_DIR}/${RUST_PROFILE}/lib${CRATE_NAME}.a)
# After
set(RUST_BUILD_DIR
${CMAKE_CURRENT_BINARY_DIR}/${CRATE_NAME}/target)
set(RUST_LIB_PATH
${RUST_BUILD_DIR}/${TARGET_BASE}/${RUST_PROFILE}/lib${CRATE_NAME}.a)
```
### On which OS does this issue occur?
[OS: Mac]
### What is the version of your OS?
26.4.1
### NuttX Version
12.13.0
### Issue Architecture
[Arch: arm]
### Issue Area
[Area: Examples]
### Host information
_No response_
### Verification
- [x] I have verified before submitting the report.
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