Rust Apps for Apache NuttX RTOS: Build NuttX for Ox64 SBC. See https://github.com/lupyuen/nuttx-rust-app

build-nuttx-ox64.log

$ mkdir nuttx
$ cd nuttx
$ git clone https://github.com/apache/nuttx nuttx
$ git clone https://github.com/apache/nuttx-apps apps
$ cd nuttx

$ tools/configure.sh ox64:nsh
$ make menuconfig
## TODO: Enable "Hello Rust" Example App
## https://github.com/lupyuen2/wip-nuttx/blob/rust/boards/risc-v/bl808/ox64/configs/nsh/defconfig
$ make

## Build NuttX with Tracing Enabled
$ make --trace export
$ pushd ../apps

## Build NuttX with Tracing Enabled
$ make --trace import

riscv64-unknown-elf-gcc \
  -march=rv64imafdc \
  -mabi=lp64d \
  -c \
  -fno-common \
  -Wall \
  -Wstrict-prototypes \
  -Wshadow \
  -Wundef \
  -Wno-attributes \
  -Wno-unknown-pragmas \
  -Wno-psabi \
  -fno-common \
  -pipe  \
  -Os \
  -fno-strict-aliasing \
  -fomit-frame-pointer \
  -ffunction-sections \
  -fdata-sections \
  -g \
  -mcmodel=medany \
  -isystem /Users/Luppy/ox64/apps/import/include \
  -isystem /Users/Luppy/ox64/apps/import/include \
  -D__NuttX__  \
  -I "/Users/Luppy/ox64/apps/include" \
  hello_main.c \
  -o  hello_main.c.Users.Luppy.ox64.apps.examples.hello.o

Makefile:52: target '/Users/Luppy/ox64/apps/examples/hello_rust_install' does not exist
make -C /Users/Luppy/ox64/apps/examples/hello_rust install APPDIR="/Users/Luppy/ox64/apps"
make[3]: Entering directory '/Users/Luppy/ox64/apps/examples/hello_rust'
make[3]: *** No rule to make target 'hello_rust_main.rs.Users.Luppy.ox64.apps.examples.hello_rust.o', needed by '/Users/Luppy/ox64/apps/bin/hello_rust'.  Stop.
make[3]: Leaving directory '/Users/Luppy/ox64/apps/examples/hello_rust'
make[2]: *** [Makefile:52: /Users/Luppy/ox64/apps/examples/hello_rust_install] Error 2
make[2]: Leaving directory '/Users/Luppy/ox64/apps'
make[1]: *** [Makefile:78: .import] Error 2
make[1]: Leaving directory '/Users/Luppy/ox64/apps'
make: *** [Makefile:84: import] Error 2

$ rustup target add riscv64gc-unknown-none-elf
$ pushd ../apps/examples/hello_rust 
$ rustc \
  --target riscv64gc-unknown-none-elf \
  --edition 2021 \
  --emit obj \
  -g \
  -C panic=abort \
  -O \
  hello_rust_main.rs \
  -o hello_rust_main.rs.Users.Luppy.ox64.apps.examples.hello_rust.o
$ popd
$ make import