preprocessor-guard-hygiene

Development

Enforce preprocessor guard rules and macro-dependent inclusion hygiene in C++. Use this skill when modifying conditional imports or preprocessor directives.

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Source SKILL.md: https://github.com/google/filament/blob/HEAD/skills/preprocessor_guard_hygiene/SKILL.md

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Copying this prompt does not install or run the skill. Review third-party files before use. Codex skill guide

Preprocessor Guard Hygiene

Simple Guarded Includes: Headers wrapped inside single-line preprocessor guards (like #if __EXCEPTIONS or #if defined(__ARM_NEON)) must remain wrapped and are sorted alphabetically within their correct layer.
Macro-Dependent Templating: Never modify or split includes that are tightly coupled with macro configurations (such as #define UTILS_PRIVATE_IMPLEMENTATION_NON_COPYABLE in ostream.cpp). The reorganize_headers.py safety check will automatically detect and skip these; respect these skips.