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What
Prevent Windows shader-cache housekeeping from entering
std::filesystem::directory_iterator/remove_allwith an extended (\\?\) or device (\\.\) namespace root. On supported WinLibs GCC 15.2 r7, the real housekeeping worker hangs for a prefixed 270-character root containing stale version directories. This addresses the housekeeping safety request on #7462 using its suggested skip option.Keep directory creation and the active version's
last-usedupdate before the guard. Skip both directory-enumeration loops for namespace roots; ordinary roots retain version eviction and temporary-file cleanup. Record this eviction limit and remaining long-device/prebuilt-discovery gaps in shader debt.The regression launches the real cache worker in a separate process with a five-second limit and a working directory inside its own temporary sandbox. It checks stale versions with/without stamps, recent versions, stale/fresh temporaries, cached data, an updated active stamp and an unchanged outside-root tree. Windows covers ordinary, short/long extended and short device roots; Linux covers ordinary short/long roots. Cleanup uses Python's filesystem implementation, avoiding the MinGW recursive-directory path under test.
Independent of #7462, #7731 and #7933: no borrowed commits or helper dependency. Merge-tree checks with all three heads are clean. The guard also covers #7731's additional root cleanup loop when composed.
Tested
Source head
8d45d5c446f24fca428ac47f5ea52845e5cc708a, based on main00d7e611e. Baseline is unchanged main production code with the test-only overlay91853d299b58f05a0fccfbd6c2465b3535745003.agc_shader_disk_cache,shader_cache_file_read,shader_cache_native_paths: each passes 3 processes on both OSes and both revisions (9 passes per OS/revision).agc_driver_pipeline_journal: 3 passes on each revision, on AMD Radeon RX 6900 XT / Windows driver 32.0.21030.2001 and Linux lavapipe/Mesa 25.2.8 / llvmpipe LLVM 20.1.2. These are the existing GPU record/replay checks; housekeeping permutations themselves are host filesystem tests.VK_INSTANCE_LAYERS=VK_LAYER_KHRONOS_validation,ANYPS5_NO_SHADER_CACHE=1,ANYPS5_REQUIRE_VULKAN=1and verbose CTest. Loader output confirms validation insertion; no missing-layer warning, VUIDs or validation errors/warnings on baseline or change. Portable layers are from Khronos main CI, sourceaea761f4d54b86682be4099c428dba27b6609940, manifest API 1.4.365.Limits: namespace-root eviction is intentionally skipped, including short aliases. Long
\\.\aliases still fail to refresh the stamp with the supported toolchain; the device regression uses a short root. Prebuilt directory discovery is outside this guard. No full CTest suite, title execution, SMB end-to-end test or performance claim.Checklist
main; no other open PR implements the same functionsNotImplemented_nid_no_patch); silent stubs are listed under Silent stubs in their library's technical debt file.mdfiles or images added to the repository (attach them to this PR)