Find the zccache binary for compiler caching. zccache is a blazing-fast local compiler cache daemon (43x faster than other caches on warm hits). It works as a drop-in compiler launcher prefix. Search order: 1. Sibling zccache repo (../zccache/target/{release,debug}) — dev buil
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| 194 | |
| 195 | |
| 196 | def _find_zccache_binary() -> Optional[str]: |
| 197 | """ |
| 198 | Find the zccache binary for compiler caching. |
| 199 | |
| 200 | zccache is a blazing-fast local compiler cache daemon (43x faster than |
| 201 | other caches on warm hits). It works as a drop-in compiler launcher prefix. |
| 202 | |
| 203 | Search order: |
| 204 | 1. Sibling zccache repo (../zccache/target/{release,debug}) — dev builds |
| 205 | 2. PATH (via shutil.which) |
| 206 | 3. Common cargo install locations |
| 207 | |
| 208 | Returns: |
| 209 | Path to zccache binary, or None if not found. |
| 210 | """ |
| 211 | suffix = ( |
| 212 | ".exe" |
| 213 | if os.name == "nt" or sys.platform.startswith(("win", "msys", "cygwin")) |
| 214 | else "" |
| 215 | ) |
| 216 | |
| 217 | # Check project .venv first (installed release version) |
| 218 | repo_root = Path(__file__).resolve().parent.parent.parent # ci/meson/ -> repo root |
| 219 | venv_candidate = ( |
| 220 | repo_root |
| 221 | / ".venv" |
| 222 | / ("Scripts" if os.name == "nt" else "bin") |
| 223 | / f"zccache{suffix}" |
| 224 | ) |
| 225 | if venv_candidate.is_file(): |
| 226 | return str(venv_candidate) |
| 227 | |
| 228 | # Check sibling zccache repo (pick most recently built binary) |
| 229 | sibling_zccache = repo_root.parent / "zccache" |
| 230 | best: Optional[Path] = None |
| 231 | best_mtime: float = 0 |
| 232 | for profile in ("release", "debug"): |
| 233 | candidate = sibling_zccache / "target" / profile / f"zccache{suffix}" |
| 234 | if candidate.is_file(): |
| 235 | mtime = candidate.stat().st_mtime |
| 236 | if mtime > best_mtime: |
| 237 | best = candidate |
| 238 | best_mtime = mtime |
| 239 | if best is not None: |
| 240 | return str(best) |
| 241 | |
| 242 | # Check PATH |
| 243 | path_result = shutil.which("zccache") |
| 244 | if path_result: |
| 245 | return path_result |
| 246 | |
| 247 | # Check common cargo bin locations |
| 248 | for candidate_home in [ |
| 249 | os.environ.get("CARGO_HOME", ""), |
| 250 | os.path.join(os.path.expanduser("~"), ".cargo"), |
| 251 | ]: |
| 252 | if candidate_home: |
| 253 | candidate_path = os.path.join(candidate_home, "bin", f"zccache{suffix}") |
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