Eremey Valetov 99eb992ead Add DOS build script, compiler/DOS test harnesses, FreeDOS package, CI ...

- build_dos.sh: Linux-friendly cross-compile to DOS via OpenWatcom V2.
  OpenWatcom's wmake on Linux can't apply the .c.obj implicit rule for
  subdirectory paths, and Makefile.dos / Makefile.dos16 rely on DOS-
  only commands like 'del'.  Script invokes wcc / wcc386 directly,
  tracks 16-bit vs 32-bit mode via a stamp file (auto-cleans on
  switch), generates a wlink directive file (the brace-delimited file
  list wouldn't survive shell quoting), and supports clean.  The DOS
  Makefiles still work on Windows / DOS hosts.

- tests/run_compiler_tests.sh: AOT compiler harness.  For each .bas
  in tests/programs/, compiles via gwbasic-compile -c, runs the
  resulting executable, normalizes output and diffs against the
  golden file from tests/expected/.  Skip list covers chain/common
  multi-file flows, hardware/timing-dependent programs, unnumbered
  direct-mode programs (compiler requires line numbers), and
  misc_stmts/run_file (interpreter-vs-compiler ON ERROR divergence).
  Result: 56/56 pass.

- tests/run_dos_smoke.sh + dos_smoke.bas + expected: runs gwbasic16.exe
  under DOSBox-X (flatpak) with a program that exercises arithmetic,
  strings, control flow, GOSUB, FOR/NEXT, DATA/READ, DEF FN, OPEN/
  PRINT#/CLOSE, and diffs against the interpreter's golden output.
  Uses $HOME for the staging dir (DOSBox-X flatpak doesn't see /tmp).

- pkg/GWBASIC.LSM + pkg/build_pkg.sh: FreeDOS submission package.
  Produces dist/gwbasic-<VERSION>.zip with the standard FreeDOS
  layout (APPINFO/GWBASIC.LSM, BIN/GWBASIC.EXE, DOC/GWBASIC/{README,
  CHANGES,LICENSE} with CRLF, SOURCE/GWBASIC/<full source>).  Source
  tree is filtered through git ls-files to exclude build artifacts.

- docs/Makefile: standard Sphinx Makefile so 'cd docs && make html'
  works as documented in README.md.

- .github/workflows/ci.yml: split into two jobs.  build-and-test now
  also runs the compiler harness.  New dos-cross-compile job caches
  ~/openwatcom-v2, downloads the OpenWatcom V2 snapshot if not
  cached, builds both 16-bit and 32-bit DOS binaries, asserts size
  bounds, and uploads them as artifacts.

- .gitignore: ignore .dos_build_mode (script's stamp), .link_dir/
  (transient wlink directive dir), dist/ (package output).

2026-05-03 12:26:09 -04:00

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