On 06/09/2011 07:54 PM, Khem Raj wrote: > On 06/09/2011 04:51 PM, Tom Rini wrote: >> 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. > > It works on some hosts somewhat reliably and is unpredictable on some as > you say. I think keeping it optional is probably the right thing but > making it default may not be a good thing.
I'm pretty sure it's not reliable so much as lucky, but shoving the cache somewhere else and making it per-recipe makes me less worried. -- Tom Rini Mentor Graphics Corporation _______________________________________________ Openembedded-core mailing list Openembedded-core@lists.openembedded.org http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/openembedded-core
