toku-mac opened a new pull request, #18992:
URL: https://github.com/apache/nuttx/pull/18992
## Summary
Previously, sim builds on Apple Silicon used aarch64-apple-darwin as
the Rust target, which sets target_os=macos and breaks NuttX-specific
conditional compilation.
This PR introduces tools/aarch64-unknown-nuttx-macho.json, a custom
Rust target that sets os=nuttx while producing Mach-O objects
compatible with the macOS simulator linker. tools/Rust.defs is updated
to select this target when building sim on macOS.
## Impact
Allows proper building of sim on Apple Silicon Macs and aarch64 Linux.
(Support for Intel Macs will be considered separately.)
## Testing
I confirm that changes are verified on local setup and works as intended:
* Build Host(s): OS (macOS 26.5), CPU(Apple M1), compiler(Apple clang
version 21.0.0)
* Target(s): arch(sim)
* Ensure your PATH environment variable is properly configured to allow
execution of: menuconfig, olddefconfig, savedefconfig, and setconfig.
* Use the Rust toolchain version prior to nightly-2026-04-29 to avoid errors
related to
lib/rustlib/src/rust/library/std/src/sys/net/connection/socket/unix.rs.
* This PR is a successor of PR #18978
Configuration and Build:
```
rm -rf build-debug
make distclean
cmake -S . -B build-debug -DBOARD_CONFIG=sim:nsh -GNinja
printf "CONFIG_SYSTEM_TIME64=y
CONFIG_FS_LARGEFILE=y
CONFIG_TLS_NELEM=16
CONFIG_DEV_URANDOM=y
CONFIG_EXAMPLES_HELLO_RUST_CARGO=y
CONFIG_EXAMPLES_HELLO_RUST_CARGO_STACKSIZE=8192
" >> build-debug/.config
cmake --build build-debug -t olddefconfig
cmake --build build-debug
```
Testing logs before change:
```
NuttShell (NSH) NuttX-12.13.0
nsh> hello_rust_cargo
{"name":"John","age":30}
{"name":"Jane","age":25}
Deserialized: Alice is 28 years old
Pretty JSON:
{
"name": "Alice",
"age": 28
}
thread '<unnamed>' (1797510) panicked at
/Users/toku/.rustup/toolchains/nightly-2026-04-29-aarch64-apple-darwin/lib/rustlib/src/rust/library/std/src/sys/pal/unix/time.rs:107:68:
called `Result::unwrap()` on an `Err` value: Os { code: 0, kind:
Uncategorized, message: "Unknown error 0" }
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
```
Testing logs after change:
```
NuttShell (NSH) NuttX-12.13.0
nsh> hello_rust_cargo
{"name":"John","age":30}
{"name":"Jane","age":25}
Deserialized: Alice is 28 years old
Pretty JSON:
{
"name": "Alice",
"age": 28
}
Hello world from tokio!
```
## PR verification Self-Check
* [x] My PR adheres to Contributing
[Guidelines](https://github.com/apache/nuttx/blob/master/CONTRIBUTING.md) and
[Documentation](https://nuttx.apache.org/docs/latest/contributing/index.html)
(git commit title and message, coding standard, etc).
* [x] My PR is ready for review and can be safely merged into a codebase.
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