[OE-core] [Yocto] The design document for ccache-native

[Tom Rini]

On 06/09/2011 03:40 PM, Saul Wold wrote:
> On 06/02/2011 08:11 PM, wenzong fan wrote:
>> Hi Folks,
>>
>> Please help me to review the design document for ccache-native, and
>> I also have two questions about it, any answers or suggestions are
>> appreciated.
>>
>> * Feature name: ccache-native
>>     Priority: P3; M2
>>     Owner: Wenzong Fan
>>     Summary: Integrate ccache-native to yocto
>>
>> * Description:
>> Bitbake supports the 'CCACHE Mechanism', but 'ccache' hasn't been
>> included by poky/yocto, just add it as a native tool.
>>
>> * Usage:
>> Build ccache as a native tool by default and enable it for speeding
>> target packages build.
>>
>> * Implementation:
>> 1) Copy bb file from OE upstream to:
>>       meta/recipes-devtools/ccache/
>>
>> 2) Update bb file to get the latest ccache_3.1.5 and split the single
>> bb file to:
>>       'ccache_3.1.5.bb', 'ccache.inc'
>>
>> 3) Enable ccache in the native tools building.
>>
> You will need to have it be a dependency pretty early on in the build.
> Additionally, this is a bit a new part to this task, we want to have the
> default CCACHE_DIR for the build default to a directory in TMPDIR
> instead of the user's home directory.  This will mean setting an
> environment variable somewhere early also.

Can we instead veto ccache and remove it from the bitbake docs?  I can't
count the number of times I've run into what I can only imagine are
ccache conflicts to explain why a random build failure with ccache in use.

-- 
Tom Rini
Mentor Graphics Corporation