is ccache working effectively?

Erik Joelsson erik.joelsson at
Fri Nov 9 00:24:55 UTC 2018

You can try --disable-precompiled-headers and see if that helps. We have 
had special considerations for combining these features in the past, but 
it's certainly a source of trouble for ccache.


On 2018-11-08 16:20, Maurizio Cimadamore wrote:
> On 08/11/2018 20:31, Erik Joelsson wrote:
>> I think we need more details here to figure it out, but it doesn't 
>> surprise me that hotspot is the part that's failing. Building hotspot 
>> is way more complex than the rest. 
> Digging more into the command lines of the various HS files, they 
> include many generated sources and, also this folder:
> build/<CONF>/hotspot/variant-server/libjvm/objs/precompiled
> Now, I don't know exactly how ccache deals with PCH but I notices that 
> every time that the files in this folder are regenerated by the build 
> (I can easily do that by rerunning the same command line that is 
> stored inside the , a ccache miss follows.
> Maurizio

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