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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 (including LUnix/LNG), .a2 for Apple, .xex for Atari computers, .bin for Atari VCS, .nes for NES, no extension for BBC micro program file, .inf for BBC Micro metadata, .d88 for PC-88 disk images, .tap for ZX-Spectrum tape images.

  • -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 name 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.

  • -D <feature>=<value> – Defines a feature value for the preprocessor.

  • -finput_intel_syntax, -finput_zilog_syntax – Choose syntax for assembly sources on 8080-like targets. Can be overridden by the source file itself using #pragma. .ini equivalent: input_intel_syntax. Default: Intel (true) on Intel 8080, Zilog (false) otherwise.

  • -foutput_intel_syntax, -foutput_zilog_syntax – Choose syntax for assembly output on 8080-like targets. .ini equivalent: output_intel_syntax. Default: Intel (true) on Intel 8080, Zilog (false) otherwise.

  • --syntax=intel, --syntax=zilog – sets both previous options at once

  • -fline-numbers, -fno-line-numbers – Whether should show source line numbers in assembly output. Slightly slows down the compilation. Default: false.

  • -fsource-in-asm, -fno-source-in-asm – Whether should show the original source in assembly output. Implies -fline-numbers. Default: false.

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 or a non-6502 architecture, yes otherwise.

  • -fzp-register=[0-15], -fno-zp-register – Sets the size of the zeropage pseudoregister. Increases language features on 6502-based targets. Recommended values: 2 or 4. Values higher than 4 are pointless.
    .ini equivalent: zeropage_register. Default: 4 if targeting a 6502-based architecture, 0 otherwise.

  • -fdecimal-mode, -fno-decimal-mode – Whether hardware decimal mode should be used (6502 only). If disabled, a sofware decimal mode will be used.
    .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, -fno-bounds-checking – Whether should insert bounds checking on array access.
    Default: no.

  • -fcompact-dispatch-params, -fno-compact-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.

  • -flenient-encoding, -fno-lenient-encoding – Whether the compiler should allow for invalid characters in string/character literals that use the default encodings and replace them with alternatives. .ini equivalent: lenient_encoding. Default: yes on Apple II, no otherwise.

  • -fshadow-irq, -fno-shadow-irq – Whether the interrupt routines should make use of Z80 shadow registers. .ini equivalent: use_shadow_registers_for_irq. Default: yes on Z80, no otherwise.

  • -fuse-ix-for-stack, -fuse-iy-for-stack, -fno-use-index-for-stack – Which of Z80 index registers should be used for accessing stack variables, if any. .ini equivalent: ix_stack and iy_stack. Default: IX on Z80, no otherwise.

  • -fuse-ix-for-scratch, -fno-use-ix-for-scratch – Allow using the IX register for other purposes. .ini equivalent: ix_scratch. Default: no.

  • -fuse-iy-for-scratch, -fno-use-iy-for-scratch – Allow using the IY register for other purposes. .ini equivalent: iy_scratch. Default: no.

  • -fsoftware-stack, -fno-software-stack – Use a software stack for stack variables. .ini equivalent: software_stack. Default: no.

Optimization options

  • -O0 – Disable all optimizations.

  • -O, -O2 ... -O8 – Optimize code, various levels. For most code, anything above -O4 doesn't improve it anymore.

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

  • -finline, -fno-inline – Whether should inline functions automatically. See the documentation about inlining. Computationally easy, can give decent gains. .ini equivalent: inline.

  • -fipo, -fno-ipo – Whether should perform interprocedural optimization. It enables certain optimization similar to what inlining would enable, but without actual inlining. .ini equivalent: ipo.

  • -foptimize-stdlib, -fno-optimize-stdlib – Whether should replace some standard library calls with constant parameters with more efficient variants. Currently affects putstrz and strzlen, but may affect more functions in the future. .ini equivalent: optimize_stdlib.

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

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

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

  • -fdangerous-optimizations – Use dangerous optimizations (experimental). Dangerous optimizations are more likely to result in broken code. Enables -fipo automatically. .ini equivalent: dangerous_optimizations.

Note: for compatibility with versions 0.3.0 and earlier, command line options --inline, --dangerous-optimizations --fipo and --fno-ipo are still recognized, but discouraged.

Warning options

  • -Wall – Enable extra warnings.

  • -Wfatal – Treat warnings as errors.