The upstream bugs are still open:

https://github.com/cython/cython/issues?q=is%3Aissue%20is%3Aopen%20cycache



On Saturday, September 10, 2016 at 5:36:53 PM UTC+2, leif wrote:
>
> Volker Braun wrote: 
> > There is cycache, but its currently disabled in Sage as we ran into some 
> > bugs. 
>
> Well, since quite a while though, isn't it? 
>
> Did anyone recently check whether the issue still exists, or could you 
> give a pointer? 
>
>
> -leif 
>
>
> > On Saturday, September 10, 2016 at 12:20:54 AM UTC+2, William wrote: 
> > 
> >     On Fri, Sep 9, 2016 at 3:08 PM, Volker Braun <vbrau...@gmail.com 
> >     <javascript:>> wrote: 
> >     > Whenever you switch to a branch with a different working set you 
> >     change 
> >     > timestamps of modified files. Git does not track timestamps. 
> Updated 
> >     > timestamps cause recompilation. 
> > 
> >     So... instead of using timestamps, maybe Cython should use file 
> hashes 
> >     to determine whether or not to recompile code?    My distant memory 
> of 
> >     when we first wrote the cython dep code for Sage long long ago was 
> >     that I used timestamps, then Craig Citro or Robert Bradshaw wrote 
> >     something better using hashes, but I'm not sure.  I'm cc'ing them in 
> >     case they have any thoughts. 
> > 
> > 
> >     -- 
> >     William (http://wstein.org) 
>
>
>

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