# KTC Local Patch Notes

This file records local changes made to `ktc` so future updates can be re-applied and re-tested.

## 2026-01-28: Prefer prebuild toolchain binaries when USE_PREBUILD is set

### Why
- Toolchain binaries/scripts were hard-coded to `/workspace/libs_V2` or `/workspace/libs`.
- In this repo, we want to use `toolchain/prebuild` without modifying those system paths.

### Changes
1) **Add `_resolve_compiler_paths()` helper**  
   File: `ktc/toolchain.py`  
   - If `USE_PREBUILD` exists and is a directory, uses:
     - `prebuild/gen_config.py`
     - `prebuild/batch_compile`
     - `prebuild/kneron_nef_utils`
     - `prebuild/opt_compile` (via `OPT_COMPILE_DIR`)
   - Otherwise falls back to `LIBS_V1_FOLDER`/`LIBS_V2_FOLDER`.

2) **Use `_resolve_compiler_paths()` in these functions:**
   - `gen_config_for_single_model()` → uses `gen_config.py` from resolved path and sets `OPT_COMPILE_DIR`.
   - `generate_batch_conf()` → uses `gen_config.py` from resolved path.
   - `encrypt_compile()` → uses `batch_compile` (both 520 and non-520 cases) and `kneron_nef_utils` (for 730).

### Reapply checklist (if KTC updated)
- Re-add `_resolve_compiler_paths()` helper to `ktc/toolchain.py`.
- Rewire the call sites listed above to use the helper.

### Tests to run
```
pytest -s ./tests/workers/test_bie_core.py
pytest -s ./tests/workers/test_nef_core.py
```

### Notes
- `kneron_nef_utils` must exist in `toolchain/prebuild/`. If missing, copy it from `libs_V2/compiler/`.