toku-mac opened a new pull request, #3483:
URL: https://github.com/apache/nuttx-apps/pull/3483
## Summary
* Add macOS support to the `hello_rust_cargo` CMake build configuration.
* Depends on nuttx PR: sim/posix: Add APPLE to a build target for sim's
configuration using CMake.
## Impact
* Impact on build: Enables building on macOS.
## 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.
Configuration:
```
❯ make distclean
NuttX has not been configured!
To configure the project:
tools/configure.sh <config>
For a list of available configurations:
tools/configure.sh -L
❯ cmake -S . -B build-debug -DBOARD_CONFIG=sim:nsh -GNinja
-- NuttX Host Tools
-- CMake C compiler: AppleClang
-- CMake system name: Darwin
-- CMake host system processor: arm64
TOOLS_DIR path is "/Users/toku/nuttxspace/nuttx"
HOST = Darwin
-- Configuring done (0.1s)
-- Generating done (0.4s)
-- Build files have been written to:
/Users/toku/nuttxspace/nuttx/build-debug/bin_host
-- nuttx_add_subdirectory: Skipping cxx-oot-build
-- Configuring done (2.9s)
-- Generating done (1.0s)
-- Build files have been written to: /Users/toku/nuttxspace/nuttx/build-debug
❯ 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
[0/2] Re-checking globbed directories...
[1/2] cd /Users/toku/nuttxspace/nuttx && /opt/homebrew...ke -E touch
/Users/toku/nuttxspace/nuttx/CMakeLists.tx
/Users/toku/nuttxspace/nuttx/build-debug/.config:1819: warning:
SYSTEM_TIME64 (defined at sched/Kconfig:170) set more than once. Old value "y",
new value "y".
/Users/toku/nuttxspace/nuttx/build-debug/.config:1820: warning: FS_LARGEFILE
(defined at fs/Kconfig:20) set more than once. Old value "y", new value "y".
/Users/toku/nuttxspace/nuttx/build-debug/.config:1821: warning: TLS_NELEM
(defined at libs/libc/tls/Kconfig:45) set more than once. Old value "16", new
value "16".
/Users/toku/nuttxspace/nuttx/build-debug/.config:1822: warning: DEV_URANDOM
(defined at drivers/crypto/Kconfig:16) set more than once. Old value "y", new
value "y".
/Users/toku/nuttxspace/nuttx/build-debug/.config:1823: warning:
EXAMPLES_HELLO_RUST_CARGO (defined at
/Users/toku/nuttxspace/apps/examples/rust/hello/Kconfig:6) set more than once.
Old value "y", new value "y".
/Users/toku/nuttxspace/nuttx/build-debug/.config:1824: warning:
EXAMPLES_HELLO_RUST_CARGO_STACKSIZE (defined at
/Users/toku/nuttxspace/apps/examples/rust/hello/Kconfig:25) set more than once.
Old value "8192", new value "8192".
Loaded configuration '/Users/toku/nuttxspace/nuttx/build-debug/.config'
Configuration saved to '/Users/toku/nuttxspace/nuttx/build-debug/.config'
```
Testing logs before change:
```
❯ cmake --build build-debug
[0/1] Re-running CMake...
-- NuttX Host Tools
-- CMake C compiler: AppleClang
-- CMake system name: Darwin
-- CMake host system processor: arm64
TOOLS_DIR path is "/Users/toku/nuttxspace/nuttx"
HOST = Darwin
-- Configuring done (0.1s)
-- Generating done (0.1s)
-- Build files have been written to:
/Users/toku/nuttxspace/nuttx/build-debug/bin_host
-- nuttx_add_subdirectory: Skipping cxx-oot-build
-- Configuring done (3.0s)
-- Generating done (0.8s)
-- Build files have been written to: /Users/toku/nuttxspace/nuttx/build-debug
[1202/1211] Building Rust crate hello
FAILED: [code=101] apps/examples/rust/hello/hello/target/debug/libhello.a
/Users/toku/nuttxspace/nuttx/build-debug/apps/examples/rust/hello/hello/target/debug/libhello.a
cd /Users/toku/nuttxspace/nuttx/build-debug/apps/examples/rust/hello &&
/opt/homebrew/bin/cmake -E env
NUTTX_INCLUDE_DIR=/Users/toku/nuttxspace/nuttx/include:/Users/toku/nuttxspace/nuttx/build-debug/include:/Users/toku/nuttxspace/nuttx/build-debug/include/arch
RUSTFLAGS= cargo build -Zbuild-std=std,panic_abort -Zjson-target-spec
--manifest-path /Users/toku/nuttxspace/apps/examples/rust/hello/Cargo.toml
--target --target-dir
/Users/toku/nuttxspace/nuttx/build-debug/apps/examples/rust/hello/hello/target
error: "--target" takes a target architecture as an argument.
Run `rustup target list` to see possible targets.
[1205/1211] Linking C static library libs/libc/libc.a
ninja: build stopped: subcommand failed.
```
Testing logs after change:
```
❯ cmake --build build-debug
[0/2] Re-checking globbed directories...
[1/2] Re-running CMake...
-- NuttX Host Tools
-- CMake C compiler: AppleClang
-- CMake system name: Darwin
-- CMake host system processor: arm64
TOOLS_DIR path is "/Users/toku/nuttxspace/nuttx"
HOST = Darwin
-- Configuring done (0.1s)
-- Generating done (0.2s)
-- Build files have been written to:
/Users/toku/nuttxspace/nuttx/build-debug/bin_host
-- nuttx_add_subdirectory: Skipping cxx-oot-build
-- Configuring done (2.0s)
-- Generating done (1.2s)
-- Build files have been written to: /Users/toku/nuttxspace/nuttx/build-debug
[0/4] Re-checking globbed directories...
[1202/1211] Building Rust crate hello
Compiling hello v0.1.0 (/Users/toku/nuttxspace/apps/examples/rust/hello)
Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.26s
[1207/1211] Linking C executable nuttx
ld: warning: -ld_classic is deprecated and will be removed in a future
release
[1208/1211] Generating System.map
took 30s
❯ ./build-debug/nuttx
NuttShell (NSH) NuttX-12.13.0
nsh> help
help usage: help [-v] [<cmd>]
. cmp fdinfo mkrd rm true
[ dirname free mount rmdir truncate
? df help mv set uname
alias dmesg hexdump pidof kill umount
unalias echo losetup poweroff pkill unset
basename env ln quit sleep uptime
break exec ls printf usleep watch
cat exit mkdir ps source xd
cd expr mkfatfs pwd test wait
cp false mkfifo readlink time
Builtin Apps:
dd nsh gpio
dumpstack sh hello
gcov ostest hello_rust_cargo
nsh> uname -a
NuttX 12.13.0 1076cb933d-dirty May 15 2026 14:48:07 sim sim
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!
# An infinite loop here.
```
## 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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