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3.2.6 Z80 Options

- [--callee-saves-bc] Force a called function to always save BC.
- [--no-std-crt0] When linking, skip the standard crt0.rel object file. You must provide your own crt0.rel for your system when linking.
- [--portmode=<Value>] Determinate PORT I/O mode (<Value> is z80 or z180).
- [--asm=<Value>] Define assembler name (<Value> is rgbds, sdasz80, isas or z80asm).
- [--codeseg <Value>] Use <Value> for the code segment name.
- [--constseg <Value>] Use <Value> for the const segment name.
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