toku-mac opened a new pull request, #18957:
URL: https://github.com/apache/nuttx/pull/18957
## Summary
Set host-specific Kconfig values before the initial `olddefconfig` step in
the CMake build, and clarify the helper arguments used for that setup.
On macOS, `sim:nsh` needs `HOST_MACOS=y` to be present before the sim
toolchain choice is resolved. Without that, the first `olddefconfig` may select
the default GCC toolchain instead of the macOS-specific Clang default.
As a result, you encounter the error `ld: library not found for -lgcov`.
This PR updates the CMake initialization flow so `nuttx_sethost()` can apply
host settings to the temporary `.config.compressed` before the first
`olddefconfig`.
The helper functions were also refactored to use named arguments:
```cmake
nuttx_sethost(CONFIG_FILE ...)
nuttx_setconfig(CONFIG_FILE ... SETTINGS ...)
```
## Impact
`CONFIG_SIM_TOOLCHAIN_CLANG=y` is enabled, which resolves linker errors.
## 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:
```
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
```
Testing logs before change:
```
...
Compiling proc_macro v0.0.0
(/Users/toku/.rustup/toolchains/nightly-2026-04-29-aarch64-apple-darwin/lib/rustlib/src/rust/library/proc_macro)
Compiling itoa v1.0.18
Compiling pin-project-lite v0.2.17
Compiling memchr v2.8.0
Compiling tokio v1.52.3
Compiling hello v0.1.0 (/Users/toku/nuttxspace/apps/examples/rust/hello)
Finished `dev` profile [unoptimized + debuginfo] target(s) in 21.46s
[1224/1229] Linking C executable nuttx
FAILED: [code=1] nuttx
: && /usr/bin/cc -arch arm64 -Wl,-search_paths_first
-Wl,-headerpad_max_install_names -Wl,-dead_strip
-Wl,-ld_classic,-no_fixup_chains @CMakeFiles/nuttx.rsp -o nuttx && :
ld: warning: -ld_classic is deprecated and will be removed in a future
release
ld: library not found for -lgcov
clang: error: linker command failed with exit code 1 (use -v to see
invocation)
ninja: build stopped: subcommand failed.
```
Testing logs after change:
```
...
Compiling proc_macro v0.0.0
(/Users/toku/.rustup/toolchains/nightly-2026-04-29-aarch64-apple-darwin/lib/rustlib/src/rust/library/proc_macro)
Compiling itoa v1.0.18
Compiling pin-project-lite v0.2.17
Compiling memchr v2.8.0
Compiling tokio v1.52.3
Compiling hello v0.1.0 (/Users/toku/nuttxspace/apps/examples/rust/hello)
Finished `dev` profile [unoptimized + debuginfo] target(s) in 21.63s
[1222/1227] Linking C executable nuttx
ld: warning: -ld_classic is deprecated and will be removed in a future
release
[1224/1227] Generating System.map
```
## 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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