On Saturday, 17 September 2016 at 18:46:26 UTC, Johan Engelen
wrote:
I just finished another post about LDC:
https://johanengelen.github.io/ldc/2016/09/17/LDC-object-file-caching.html
Great innovative work!
One thing: I'm missing an option for only doing time-stamp
checking of the dependencies similar to how SCons checks if
cached files are obselete.
See the Decider function documented here:
http://www.scons.org/doc/HTML/scons-user/ch06.html#idp1416061700
It can be either
- Decider('MD5')
- Decider('timestamp-newer')
- Decider('timestamp-match')
- Decider('MD5-timestamp')
As I see it the LDC-enhancement always does content hashing, that
is, it is similar to SCons' `Decider('MD5')`. If so, it would be
very worthwhile checking how much faster an approach similar to
`Decider('MD5-timestamp')` would be. This approach only hashes
content of dependencies if they have been modified since last
hashing during last build of that object with the same compiler
flags was done.
