chore(setup_helpers): remove dead cpp_flag_cache and fix parameter typo#6085
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Remove the module-level `cpp_flag_cache = None` variable and its stale comment "Every call will cache the result". The actual caching is handled by the `@lru_cache` decorator on `auto_cpp_level` directly below. Also rename the typo'd parameter `obg` to `obj` in `no_recompile`. Nothing passes this argument by keyword, so there is no API break. Part of pybind#6084 Assisted-by: ClaudeCode:claude-sonnet-4-6
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virtuald
approved these changes
Jun 17, 2026
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Part of #6084
Summary
cpp_flag_cache = Noneand its stale comment# Every call will cache the result. The actual caching is already handled by the@lru_cachedecorator onauto_cpp_leveljust below it; the variable was never read anywhere in the codebase.obgtoobjinno_recompile(obg: str, src: str). Nothing passes this argument by keyword (it is only used as aneeds_recompilecallback passed positionally), so there is no API break.Test plan
grep -rn cpp_flag_cache— only the one definition, now removedgrep -rn "no_recompile\|obg"— no callers use keyword argumentobgprek -a --quietpasses cleanlyuv run --with setuptools python -c "import pybind11.setup_helpers"succeeds