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xcode-compilation-analyzer

Analyze Swift and mixed-language compile hotspots using build timing summaries and Swift frontend diagnostics, then produce a recommend-first source-level optimization plan. Use when a developer reports slow compilation, type-checking warnings, expensive clean-build compile phases, long CompileSwiftSources tasks, warn-long-function-bodies output, or wants to speed up Swift type checking.

skills/xcode-compilation-analyzer/SKILL.md

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# Xcode Compilation Analyzer

Use this skill when compile time, not just general project configuration, looks like the bottleneck.

## Core Rules

- Start from evidence, ideally a recent `.build-benchmark/` artifact or raw timing-summary output.
- Prefer analysis-only compiler flags over persistent project edits during investigation.
- Rank findings by expected **wall-clock** impact, not cumulative compile-time impact. When compile tasks are heavily parallelized (sum of compile categories >> wall-clock median), note that fixing individual hotspots may improve parallel efficiency without reducing build wait time.
- When the evidence points to parallelized work rather than serial bottlenecks, label recommendations as "Reduces compiler workload (parallel)" rather than "Reduces build time."
- Do not edit source or build settings without explicit developer approval.

## What To Inspect