PROBLEM: Setting cache_dir='~/.ccache' explicitly stores the
LITERAL tilde in ccache.conf, which might not expand properly.
SOLUTION: Don't set cache_dir at all - let ccache use its default
- Linux default: ~/.ccache
- ccache will expand the tilde correctly when using default
- Only configure max_size, hash_dir, compiler_check
- Remove CCACHE_DIR env var (not needed with default)
This should fix the issue where ccache runs but creates no cache files.
Removed split ccache configuration (~/.ccache-main + ~/.ccache-current).
The split had an edge case: building a feature branch before main branch
cache is primed results in double ccache disk usage:
- Feature branch builds first → populates ~/.ccache-current (2G max_size)
- Main branch builds later → populates ~/.ccache-main (2G max_size)
- Next feature branch build → restores both caches (4G total)
This doubles ccache disk usage unnecessarily on GitHub-hosted runners.
New single-directory approach:
- Single ~/.ccache directory for all branches
- Branch-specific keys with restore-keys fallback to main branch
- Cache actions handle cross-branch sharing via partial-match mode
- Simpler and prevents double disk usage edge case
Changes:
- xahau-configure-ccache: Single cache_dir input, removed branch logic
- xahau-ga-build: Single restore/save step, uses restore-keys for fallback
- xahau-ga-nix: Removed is_main_branch parameter
Disk usage: 2G max (vs 4G worst case with split)
