Hi all,
After experimenting with thin-lto caching behaviour I found an issue with pruning when on Windows.
Thin-lto cache file atimes are used for expiration based pruning, and since Vista, access file times are not updated by Windows by default:
https://blogs.technet.microsoft.com/filecab/2006/11/07/disabling-last-access-time-in-windows-vista-to-improve-ntfs-performance/
This means on Windows, cache files are currently being pruned from creation time.
I’ve made a patch for this so any feedback would be appreciated:
D47266
Thanks,
Owen