Add ccache troubleshooting docs and analysis scripts#5185
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Add docs/development/ccache_troubleshooting.md covering: - CI infrastructure (remote cache servers, namespace versioning, platform differences, Windows drive mounts) - How to download and inspect ccache logs from CI - Symptoms of poor cache hit rates and their fixes - Validation procedures for compiler reproducibility, path stability, and flag stability Add two analysis scripts to build_tools/hack/ccache/: - analyze_ccache_logs.py: Downloads ccache logs from S3 and reports hit/miss rates broken down by compiler and subproject - compare_ccache_by_project.py: Compares per-subproject hit rates across two log files (e.g. Linux vs Windows) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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Motivation
Follow-up to #5141, documenting what was learned while debugging and contributing a few (hacky) scripts that helped my coding agent in its analysis.
See also:
Technical Details
The documentation and scripts here were mostly generated by Claude Code following a multi-day debugging session. The intended audience is both humans and coding agents, so together we won't need to rediscover so much the next time we're debugging poor cache behavior.
Test Plan
Ran the new scripts myself:
Analyze "baseline"
Analyze "with fixes"
Compare "baseline" to "with fixes"
Submission Checklist