[PATCH] D54826: [Support/FileSystem] Add sub-second precision for atime/mtime of sys::fs::file_status on unix platforms

[Argyrios Kyrtzidis via Phabricator via llvm-commits]

akyrtzi added a comment.

In D54826#1307402 <https://reviews.llvm.org/D54826#1307402>, @aaron.ballman wrote:

> Is it going to be an issue that the Windows side of things has a more wild idea of file timestamp resolution? NTFS has a theoretical max precision of 100ns intervals, though according to MSDN, the access time on NTFS has a resolution of 1 hour, which is better than FAT file systems, where the resolution is 1 day. It seems odd to rely on ns resolution for access time, as that seems like it's going to be highly platform and filesystem dependent.


I can't speak for the Windows side of things but what you are pointing out is a general question about applications taking into account that file properties may differ across platforms. This is orthogonal to `file_status` itself reporting file properties accurately.
If current `file_status` has 1 hour resolution on NTFS for access time, this patch is not going to make it any better or worse, nor affect behavior of applications that are querying files from NTFS.


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