[shkyyy18]

Summary

Fixes #105. Command-line -D and -U options were collected separately and applied as all definitions followed by all undefinitions, losing their order. For example, -DFOO=1 -UFOO -DFOO=2 leaves FOO undefined instead of expanding it to 2.

Record the operations as argparse processes them and replay them in order. Preserve the existing args.defines and args.undefines lists and definition parsing, including bare definitions and values containing =. -N behavior is unchanged.

Verification

Tests use unittest and synthetic stdin/stdout, as required by AGENTS.md. On Windows and Python 3.12.10:

• Before the source fix, the 10 new regression/control tests had 5 failures and 5 passes.
• After the fix, python -m unittest tests.issue0105 -v: 10 passed.
• Full pytest suite before: 77 passed, 2 failed; after: 87 passed, the same 2 failed. Both failures are the pre-existing alternate_input_encodings.py UTF-16 input cases in this environment. They were not changed or hidden.
• python setup.py build: passed (existing setuptools deprecation warnings).
• git diff --check: passed.
• The documented python setup.py test cannot run with installed setuptools 84 because its test command has been removed. Full CI/Python/platform matrix was not run locally.

No changes were made inside the PLY submodule. AI assistance (OpenAI Codex) was used for investigation, implementation and testing; the minimal diff and before/after results were reviewed against current upstream master.