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millfork/docs/api/command-line.md
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Command-line options

General options

  • --version Display the version number and quit.

  • --help Displays help the command line option.

  • -- End of the options, all the following parameters will be treated as input files, even if they look like options.

I/O options

  • -o <file> Output filename, without extension. Extension will be added automatically, .prg for Commodore, .a2 for Apple and .xex for Atari.

  • -s Generate also the assembly output. It is not compatible with any assembler, but it serves purely informational purpose. The file has the same nam as the output file and the extension is .asm.

  • -g Generate also the label file. The label file contains labels with their addresses, with duplicates removed. It can be loaded into the monitor of the Vice emulator for debugging purposes. The file has the same nam as the output file and the extension is .lbl.

  • -I <dir>;<dir> The include directories. The current working directory is also an include directory. Those directories are searched for modules and platform definitions.

  • -t <platform> Target platform. It is loaded from an .ini file found in any of the include directories. See also this document.

  • -r <program> Run given program after successful compilation. Useful for automatically launching emulators without any external scripting.

Verbosity options

  • -q Suppress all messages except for errors.

  • -v, -vv, -vvv Increase verbosity, various levels.

Code generation options

  • -fcmos-ops, -fno-cmos-ops Whether should emit CMOS opcodes.
    .ini equivalent: emit_cmos. Default: yes if targeting a 65C02-compatible architecture, no otherwise.

  • -fillegals, -fno-illegals Whether should emit illegal (undocumented) NMOS opcodes.
    .ini equivalent: emit_illegals. Default: no.

  • -f65ce02-ops, -fno-65ce02-ops Whether should emit 65CE02 opcodes.
    .ini equivalent: emit_65ce026. Default: yes if targeting 65CE02, no otherwise.

  • -fhuc6280-ops, -fno-huc6280-ops Whether should emit HuC6280 opcodes.
    .ini equivalent: emit_huc6280. Default: yes if targeting HuC6280, no otherwise.

  • -fno-65816-ops, -femulation-65816-ops, -fnative-65816-ops Which subset of 65816 instructions to support. -fnative-65816-ops is required to use any 16-bit operations. Currently, there is not much support in the compiler for the native mode. .ini equivalent: emit_65816. Default: native if targeting 65816, no otherwise.

  • -fjmp-fix, -fno-jmp-fix Whether should prevent indirect JMP bug on page boundary.
    .ini equivalent: prevent_jmp_indirect_bug. Default: no if targeting a 65C02-compatible architecture, yes otherwise.

  • -fzp-register, -fno-zp-register Whether should reserve 2 bytes of zero page as a pseudoregister. Increases language features. .ini equivalent: zeropage_register. Default: yes.

  • -fdecimal-mode, -fno-decimal-mode Whether decimal mode should be available.
    .ini equivalent: decimal_mode. Default: no if targeting Ricoh, yes otherwise.

  • -fvariable-overlap, -fno-variable-overlap Whether variables should overlap if their scopes do not intersect.
    Default: yes.

  • -fbounds-checking, -fnobounds-checking Whether should insert bounds checking on array access.
    Default: no.

  • -fcompact-dispatch-params, -fnocompact-dispatch-params Whether parameter values in return dispatch statements may overlap other objects. This may cause problems if the parameter table is stored next to a hardware register that has side effects when reading.
    .ini equivalent: compact_dispatch_params. Default: yes.

Optimization options

  • -O0 Disable all optimizations.

  • -O, -O2, -O3 Optimize code, various levels.

  • -O9 Optimize code using superoptimizer (experimental). Computationally expensive, decent results.

  • --inline Inline functions automatically (experimental). See the documentation about inlining. Computationally easy, can give decent gains.

  • --size Optimize for size, sacrificing some speed (experimental).

  • --fast Optimize for speed, even if it increases the size a bit (experimental).

  • --blast-processing Optimize for speed, even if it increases the size a lot (experimental).

  • --dangerous-optimizations Use dangerous optimizations (experimental). Dangerous optimizations are more likely to result in broken code.

Warning options

  • -Wall Enable extra warnings.

  • -Wfatal Treat warnings as errors.