wllenyj opened a new issue, #3422:
URL: https://github.com/apache/nuttx-apps/issues/3422
### Description / Steps to reproduce the issue
When I configure sim:nsh in x84_64 Ubuntu, I got the target triples are
`x86_64-unknown-nuttx`. And the error is happend as
```
echo "Building Rust code with cargo..."
Building Rust code with cargo...
NUTTX_INCLUDE_DIR=/xxx/nuttx/nuttx/include:/home/lixiang/open/c/nuttx/nuttx/include/arch
cargo build -Zbuild-std=std,panic_abort --manifest-path
/xxx//nuttx/nuttx-apps/examples/rust/
hello/Cargo.toml --target x86_64-unknown-nuttx
error: failed to run `rustc` to learn about target-specific information
Caused by:
process didn't exit successfully:
`/home/XXX/.rustup/toolchains/nightly-2025-08-20-x86_64-unknown-linux-gnu/bin/rustc
- --crate-name ___ --print=file-names --target x86_64-unknown-nuttx
--crate-type bin --cr
ate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib
--crate-type proc-macro --print=sysroot --print=split-debuginfo
--print=crate-name --print=cfg -Wwarnings` (exit status: 1)
--- stderr
error: error loading target specification: could not find specification
for target "x86_64-unknown-nuttx"
|
= help: run `rustc --print target-list` for a list of built-in targets
```
We can get the target-list in 1.91.0-nightly and 1.95.0-nightly,
```
╰─[10:57] [0] $ rustc --print target-list | grep nuttx
aarch64-unknown-nuttx
armv7a-nuttx-eabi
armv7a-nuttx-eabihf
riscv32imac-unknown-nuttx-elf
riscv32imafc-unknown-nuttx-elf
riscv32imc-unknown-nuttx-elf
riscv64gc-unknown-nuttx-elf
riscv64imac-unknown-nuttx-elf
thumbv6m-nuttx-eabi
thumbv7a-nuttx-eabi
thumbv7a-nuttx-eabihf
thumbv7em-nuttx-eabi
thumbv7em-nuttx-eabihf
thumbv7m-nuttx-eabi
thumbv8m.base-nuttx-eabi
thumbv8m.main-nuttx-eabi
thumbv8m.main-nuttx-eabihf
```
There is no `x86_64-unknown-nuttx` support in the Rust target-list.
### On which OS does this issue occur?
[OS: Linux]
### What is the version of your OS?
Ubuntu 22.04.5
### NuttX Version
master
### Issue Architecture
[Arch: x86_64]
### Issue Area
[Area: Build System]
### Host information
Ubuntu 22.04.5
### Verification
- [x] I have verified before submitting the report.
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