# `sprinter-cc` — compiler driver

One-line entrypoint to the entire toolchain.  Takes `.c` files plus options
and emits a SprintEXE.

## Synopsis

```
sprinter-cc -o OUT.exe SRC.c [more.c ...] [options]
```

## Options

### Memory layout

| Flag | Description |
|---|---|
| `--memory MODE` | `tiny` (default), `small`, `big`, `huge`, `manual`.  See `memory_modes.md`. |
| `--memory-manual SPEC` | For `--memory manual`: comma-separated `KEY=VAL` list, e.g. `CODE=W2,DATA=W2,BANKED=W3`. |
| `--stack-size N` | Bytes reserved for the stack.  Default ≈ 1278.  Larger value reduces the heap. |

### Code organisation

| Flag | Description |
|---|---|
| `--bank N=FILE.c` | Compile FILE.c into bank N (1..15).  Repeatable.  Functions in banked files need the `__banked` qualifier. |
| `--crt0=TYPE` | Override startup file: `default` / `minimal` / `banked` / `small`.  Normally chosen automatically by the memory mode. |

### Diagnostics

| Flag | Description |
|---|---|
| `--debug` | Prepends `DEBUG_RT = 1` to crt0 and passes `-DDEBUG_RT` to SDCC.  Exposes runtime introspection symbols like `_w2_self_allocated`. |
| `-v` | Verbose — echo every sub-command. |
| `-h` / `--help` | Built-in help. |

### Passthrough

| Flag | Description |
|---|---|
| `-I PATH` | Extra include path. |
| `-Wl FLAG` | Pass FLAG to the linker. |
| `--mkexe FLAG` | Pass FLAG to mkexe (e.g. `--mkexe -p --mkexe 0` for zero-padded banks). |
| `-L 0xADDR` | Override load address. |
| `-E 0xADDR` | Override entry address. |
| `-S 0xADDR` | Override initial stack address.  Default `0xBFFE`. |

## Examples

Smallest possible build:
```sh
sprinter-cc -o hello.exe hello.c
```

Larger program (doesn't fit in 14 KB):
```sh
sprinter-cc --memory small -o big.exe big.c
```

Multi-bank game:
```sh
sprinter-cc --memory huge -o game.exe \
    main.c --bank 1=engine.c --bank 2=ai.c --bank 3=audio.c
```

Custom stack size:
```sh
sprinter-cc --stack-size 4096 -o app.exe app.c
```

## Under the hood

1. Picks crt0 based on `--memory` (and `--bank` presence).
2. Assembles crt0 (with optional `DEBUG_RT` / `BANK_W1` prepended).
3. Assembles `heap_top.s` (custom value if `--stack-size`).
4. Compiles every source `.c` to `.rel` via SDCC.
5. Compiles bank sources with `--codeseg/--constseg/--dataseg BANK_n`.
6. Compiles `runtime/bank.s` trampoline (if banks are used).
7. Links everything to `.ihx`, runs `check_banks.py` to enforce 16 KB bank limits.
8. Calls `toolchain/mkexe/mkexe` to wrap the `.ihx` as SprintEXE.

Per-build artefacts go in `.sprinter-cc-<basename>/` next to the output.