Re: Using hash instead of timestamps to check for changes.

[Paul Smith]

On Fri, 2015-03-27 at 11:45 -0400, Paul Smith wrote:
>       * Do we really need to hash the file?  Maybe simply expanding the
>         current checking is sufficient.  For example, if in addition to
>         mod time we also considered the size of the file (and maybe
>         other things maintained by the filesystem like inode, for tools
>         which don't just overwrite the same file) we could increase our
>         accuracy WITHOUT resorting to a separate state file.  Is that
>         good enough?

Actually I typed faster than my brain: we still need a state file of
course to compare sizes.  But at least it's still based on filesystem
metadata and doesn't require make to hash the contents of every file in
the build.