lupyuen / bl_iot_sdk Goto Github PK

Using the newest of nightly version rust, the error log:

+ cargo build --target /home/milili.tech/BL602/bl_iot_sdk/customer_app/sdk_app_rust_gpio/riscv32imacf-unknown-none-elf.json -Z build-std=core
error: failed to run `rustc` to learn about target-specific information

Caused by:
  process didn't exit successfully: `rustc - --crate-name ___ --print=file-names --target /home/milili.tech/BL602/bl_iot_sdk/customer_app/sdk_app_rust_gpio/riscv32imacf-unknown-none-elf.json --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro --print=sysroot --print=cfg` (exit status: 1)
  --- stderr
  error: Error loading target specification: may not set is_builtin for targets not built-in. Run `rustc --print target-list` for a list of built-in targets

While checking the log in run.sh, the rustc version is rustc 1.53.0-nightly (7af1f55ae 2021-04-15), so tried this version, it works well. After some check, finally found that nightly-2021-07-17 working, but nightly-2021-07-18 produced this error. Didn't explore more about the differences between these two versions.

If you have time, please check about this.

I see that Rhai seems to be exhausting the stack space on the BL602, which is a bit baffling for me, since I've seen somebody compiling a bare minimum engine for the ST32 which fits under 64KB...

Two things I can suggest:

1. Add no_position to the rhai dependency, which saves you one entire word for each AST node

2. Use LTO and optimize for size - not sure if this changes anything, but should yield smaller builds