# Makefile for building GW-BASIC 2026 with OpenWatcom for 16-bit DOS
#
# Usage:
#   wmake -f Makefile.dos16           (from OpenWatcom environment)
#   wmake -f Makefile.dos16 clean
#
# Requires: OpenWatcom 2.0+ targeting 16-bit real-mode DOS
# Produces: GWBASIC.EXE (interpreter, standalone MZ executable — no DOS extender)
#
# The 16-bit build uses the MEDIUM memory model (-mm):
#   - Code: multiple segments (far calls), supports > 64KB total code
#   - Data: single segment (near pointers), must fit in 64KB
#
# The compiler (GWBASCOM.EXE) is not built in 16-bit mode because it uses
# open_memstream() which is not available in 16-bit DOS.  Use Makefile.dos
# (32-bit) for the compiler.

CC = wcc
CFLAGS = -bt=dos -mm -ox -w4 -zq -za99 -Iinclude -D__MSDOS__
LINKER = wlink
LIBRARIAN = wlib

# Interpreter sources (same as 32-bit minus compiler files)
INTERP_OBJS = &
    src/main.obj src/tokens.obj src/tokenizer.obj src/error.obj &
    src/eval.obj src/interp.obj src/vars.obj src/arrays.obj &
    src/input.obj src/math_int.obj src/math_float.obj &
    src/math_transcend.obj src/strings.obj src/print.obj &
    src/fileio.obj src/program_io.obj src/print_using.obj &
    src/graphics.obj src/virmem.obj src/portio.obj src/strpool.obj &
    src/sound.obj src/tui.obj platform/hal_dos.obj

.c.obj:
    $(CC) $(CFLAGS) -fo=$@ $<

all: gwbasic.exe

gwbasic.exe: $(INTERP_OBJS)
    $(LINKER) system dos option stack=8192 name $@ file { $< }

clean: .SYMBOLIC
    del src\*.obj
    del platform\*.obj
    del gwbasic.exe