Ray Donnelly

For me, the used vars are coming up empty without this change.

OK, I've figured out what was wrong, hopefully this doesn't break anything. Please check the latest commit message for details.

Thanks @isuruf. Also, can you review the new patching stuff? The output is silly egomania, but the idea is solid! I'll come up with a key which doesn't encode to...

OK, the other thing I've slipped in here is: `Add --build-id-pat option (WIP)`, I'm not really happy with the quality of that code so I may remove it from this...

Oh yeah, for now, PR is mainly to catch issues, I expect them.

Oops, thanks, pinging @katietz

For discussion. This will greedily find and use any ccache at present. I guess we want something more controlled. Some results on macOS: ``` First build: Resource usage statistics from...

Hey Mike. Ccache stores its, err, cache in ~/.ccache at present. I don't know if it includes, for example, a hash of the ccache executable itself when making cache names....

Yes it is.

Ping @jjhelmus. If this is merged, then we can tag 3.20.2 (though merging might do that? I dunno, tags I never fully grok!)