ESC meeting minutes: 2020-01-16

[Stephan Bergmann]

On 16/01/2020 17:43, Luboš Luňák wrote:
> On Thursday 16 of January 2020, Stephan Bergmann wrote:
>> On 16/01/2020 16:50, Luboš Luňák wrote:
>>>    Note that distclean cleans up the clang compiler plugin, so for the
>>> clang slaves that would practically disable ccache.
>>
>> Wasn't that ccache set up to ignore changes to the plugin?  (But I may
>> well mis-remember, and generally don't know much about ccache and
>> setting it up.)
> 
>   I don't know if something special has been done about ccache for Jenkins
> builds, but normally ccache for each compilations remembers a hash of
> everything the compilation depends on, and verifies it before reusing a
> cached result. Compiling the clang plugin again will change the file (unless
> somebody knows how to prevent that), and so the hash will change.

<https://gerrit.libreoffice.org/plugins/gitiles/lode/+/b5b9b75f631140059dc3605a7058aa93882c3ca0%5E!> 
"disable compiler check for ccache and clang plugin compile" should be 
relevant here IIUC.  (I also think there was a discussion on this ML 
about it back then, but can't find it right now.)