71ff44828d
New Makefile.dos16 builds with OpenWatcom wcc (16-bit, MEDIUM model) producing a standard MZ executable that runs on any DOS without DOS/4GW. All 24 source files compile clean; tested on FreeDOS 1.4 via QEMU. Changes for 16-bit compatibility: - hal_dos.c: INTX macro selects int86() vs int386() based on _M_I86 - sound.c: reduce stack buffer from 8192 to 512 samples on 16-bit - tui.c: gracefully disable TUI if screen buffer allocation fails (near heap exhaustion common on 16-bit), batch mode still works - .gitignore: add .obj/.exe/.err/.lib for OpenWatcom build artifacts Size comparison: - 32-bit DOS/4GW: 175KB + 265KB extender = 440KB total - 16-bit real-mode: 127KB standalone The 32-bit build (Makefile.dos) and Linux build are unaffected. 72/72 interpreter tests pass.
45 lines
1.5 KiB
Makefile
45 lines
1.5 KiB
Makefile
# Makefile for building GW-BASIC 2026 with OpenWatcom for 16-bit DOS
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#
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# Usage:
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# wmake -f Makefile.dos16 (from OpenWatcom environment)
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# wmake -f Makefile.dos16 clean
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#
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# Requires: OpenWatcom 2.0+ targeting 16-bit real-mode DOS
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# Produces: GWBASIC.EXE (interpreter, standalone MZ executable — no DOS extender)
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#
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# The 16-bit build uses the MEDIUM memory model (-mm):
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# - Code: multiple segments (far calls), supports > 64KB total code
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# - Data: single segment (near pointers), must fit in 64KB
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#
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# The compiler (GWBASCOM.EXE) is not built in 16-bit mode because it uses
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# open_memstream() which is not available in 16-bit DOS. Use Makefile.dos
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# (32-bit) for the compiler.
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CC = wcc
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CFLAGS = -bt=dos -mm -ox -w4 -zq -za99 -Iinclude -D__MSDOS__
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LINKER = wlink
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LIBRARIAN = wlib
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# Interpreter sources (same as 32-bit minus compiler files)
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INTERP_OBJS = &
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src/main.obj src/tokens.obj src/tokenizer.obj src/error.obj &
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src/eval.obj src/interp.obj src/vars.obj src/arrays.obj &
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src/input.obj src/math_int.obj src/math_float.obj &
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src/math_transcend.obj src/strings.obj src/print.obj &
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src/fileio.obj src/program_io.obj src/print_using.obj &
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src/graphics.obj src/virmem.obj src/portio.obj src/strpool.obj &
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src/sound.obj src/tui.obj platform/hal_dos.obj
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.c.obj:
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$(CC) $(CFLAGS) -fo=$@ $<
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all: gwbasic.exe
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gwbasic.exe: $(INTERP_OBJS)
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$(LINKER) system dos option stack=8192 name $@ file { $< }
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clean: .SYMBOLIC
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del src\*.obj
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del platform\*.obj
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del gwbasic.exe
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