rdmpw3265m-changelog-20260901-1820-ccache-shell-and-cache-optimization

Configured ccache compiler wrapper symlinks in zsh (Option A) and applied recommended performance settings on rdmpw3265m.

Scope

• Host: rdmpw3265m (macOS 26.7 Intel)

Exact Files Touched

• /Users/richh/.zshrc: Added architecture-portable Homebrew ccache/libexec wrapper block to prepend ccache compiler symlinks to /opt/homebrew/bin:/opt/homebrew/sbin:/usr/local/bin:/usr/local/sbin:/Users/richh/bin:/Users/richh/.local/bin:/Users/richh/.gemini/antigravity-cli/bin:/Users/richh/dev/scripts:/Users/richh/scripts:/Users/richh/.antigravity-ide/antigravity-ide/bin:/Users/richh/.local/state/fnm_multishells/69965_1788301077257/bin:/usr/local/opt/ffmpeg-full/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin:/pkg/env/global/bin:/Library/Apple/usr/bin:/Applications/VMware Fusion.app/Contents/Public:/Users/richh/.orbstack/bin.
• /Users/richh/.ccache/ccache.conf: Created optimized ccache configuration.
• Backup: /Users/richh/.zshrc.bak.20260901181927

Configuration Applied

~/.ccache/ccache.conf:

# ccache configuration
max_size = 25.0G
base_dir = /Users/richh/dev
sloppiness = time_macros,include_file_mtime,include_file_ctime,file_macro
compression = true
compression_level = 1
compiler_check = content
inode_cache = true

~/.zshrc:

# --- ccache compiler wrappers (portable across Apple Silicon & Intel) ---
if command -v brew >/dev/null 2>&1; then
  _ccache_libexec="$(brew --prefix ccache 2>/dev/null)/libexec"
  if [[ -d "$_ccache_libexec" ]]; then
    path=("$_ccache_libexec" $path)
  fi
  unset _ccache_libexec
fi

Verification Evidence

1. Checked compiler binary resolution under interactive zsh:
   • which clang -> /usr/local/opt/ccache/libexec/clang
   • which gcc -> /usr/local/opt/ccache/libexec/gcc
   • which cc -> /usr/local/opt/ccache/libexec/cc
2. Evaluated compilation caching:
   • Compiled test C snippet with clang -c: initial pass recorded miss, re-compile recorded direct cache hit (1 hit, 1 miss).
   • Verified active max cache size is 25.0 GB via ccache -s.

How to Undo

1. Restore ~/.zshrc: cp ~/.zshrc.bak.20260901181927 ~/.zshrc
2. Remove ~/.ccache/ccache.conf: rm ~/.ccache/ccache.conf