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.

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