[yocto] When to create a new build directory for yocto?

[ChenQi]

Hi Qiang,

It's possible that you are using (or might use) different layer 
configurations for different builds.
One build might have a bbappend file that another build doesn't need.
Also, different builds may have different DISTRO_FEATURES.
Thus, having different deploy directories is better. Otherwise, your 
package feeds might be broken. And you would suffer trying to maintain it.

If space is a concern for you, inherit 'rm_work' in local.conf.

INHERIT += "rm_work"

Best Regards,
Chen Qi

On 12/01/2014 11:01 AM, Qiang Yu wrote:
> Hi Chen Qi,
>
> Thanks for your suggestion.
>
> I mean the tmp/deploy/ipk dir will have one copy each build dir. And 
> two boards of the same SOC will
> share most of them, so the disk space of the tmp/deploy/ipk part is 
> wasted.
>
> Regards,
> Qiang
>
>
> On Mon, Dec 1, 2014 at 10:01 AM, ChenQi <Qi.Chen at windriver.com 
> <mailto:Qi.Chen at windriver.com>> wrote:
>
>     Sharing sstate is safe and efficient.
>     sstate does not contain any package.
>
>     Regards,
>     Chen Qi
>
>
>     On 11/30/2014 10:28 PM, Qiang Yu wrote:
>>     Why share the sstate? Does it contain previously build ipk
>>     packages in other build directories for reuse?
>>
>>     Regards,
>>     Qiang
>>
>>     On Sun, Nov 30, 2014 at 4:03 PM, ChenQi <Qi.Chen at windriver.com
>>     <mailto:Qi.Chen at windriver.com>> wrote:
>>
>>         I would suggest to use separate build directories but let
>>         these builds to share downloads and sstate.
>>
>>         Regards,
>>         Chen Qi
>>
>>
>>         On 11/30/2014 12:49 PM, Qiang Yu wrote:
>>>         Hi all,
>>>
>>>         I'm maintaining a Yocto build system to produce these outputs:
>>>
>>>         1. ARM SOC 1
>>>           1). board 1 image
>>>           2). board 2 image
>>>           3). SDK for i686
>>>           4). SDK for x86_64
>>>         2. ARM SOC 2
>>>           1). board 3 image
>>>           2). board 4 image
>>>           3). SDK for i686
>>>           4). SDK for x86_64
>>>
>>>         Now I don't know the right way to create build directories
>>>         for these builds. The simplest way
>>>         I think is creating one build directory for each of these
>>>         builds. But it wast resource for boards
>>>         with the same SOC which can share cross toolchain. And ARM
>>>         SOC 1 and ARM SOC 2 use
>>>         different conf/bblayers.conf to add different BSP layer, I
>>>         need to modify it when switch SOC.
>>>         So the right way is creating one build directory for
>>>         each SOC, then bitbake each output's recipe,
>>>         right?
>>>
>>>         I am also not sure if I can put the SDK and board image in
>>>         the same build directory. Because
>>>         once I build a board's image after creating its SDK, I add
>>>         gdbserver to it, but the build fail without
>>>         really building the gdbserver package. So I guess the board
>>>         image build is confused by the SDK
>>>         build state.
>>>
>>>         So the conclusion is I need a recommended way to separate
>>>         output into different build directories:
>>>         1. minimize rebuild shared packages
>>>         2. no build state corruption
>>>         3. if multi output in the same build dir, no change to conf/
>>>         files or an easy way to switch between
>>>
>>>         Regards,
>>>         Qiang
>>>
>>>
>>>
>>
>>
>>         --
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>
>

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