[yocto] Building BlueZ from git in Yocto

[Burton, Ross]

If you look at the patch headers, you'll see that none of them are
tagged as backports.

Ross

On 21 March 2018 at 15:35, Alan Martinovic <alan.martinovic at senic.com> wrote:
> Hey Ross, thanks for the clarification.
>
> The issues reoccurred because I modified the recipe not to include any patches,
> falsely assuming that all of them were BlueZ backports and none is actually
> a Yocto specific change.
>
> On Wed, Mar 21, 2018 at 4:23 PM, Burton, Ross <ross.burton at intel.com> wrote:
>> On 21 March 2018 at 15:15, Alan Martinovic <alan.martinovic at senic.com>
>> wrote:
>>>
>>>
>>> Building it with Yocto results in the mentioned error:
>>>
>>> | ../git/src/genbuiltin hostname wiimote autopair policy   a2dp avrcp
>>> network input hog  gap scanparam deviceinfo  battery > src/builtin.h
>>> | ../git/obexd/src/genbuiltin filesystem bluetooth  opp ftp irmc pbap mas
>>> mns > obexd/src/builtin.h
>>> | /bin/bash: obexd/src/builtin.h: No such file or directory
>>> | Makefile:9431: recipe for target 'obexd/src/builtin.h' failed
>>> | make: *** [obexd/src/builtin.h] Error 1
>>> | make: *** Waiting for unfinished jobs....
>>> | ERROR: oe_runmake failed
>>> | WARNING: exit code 1 from a shell command.
>>>
>>>
>>> It seems that for some reason in Yocto, make can't redirect into
>>> `obexd/src/builtin.h` while
>>> it does so successfully for native build.
>>
>>
>> Yocto will be doing an out-of-tree build with high parallelism, neither of
>> which you are likely doing yourself.
>>
>> The hint is "no such file or directory" for a file it is writing *to*.  This
>> means the parent doesn't exist, in this case obexd/src/.
>>
>> This is a typical race in out-of-tree and parallel builds, where genbuiltin
>> is racing against other commands to create the directory.  The fix is to
>> ensure that whatever rule calls genbuiltin actually does a mkdir first.
>>
>> We have a fix for this already in oe-core:
>>
>> http://git.openembedded.org/openembedded-core/tree/meta/recipes-connectivity/bluez5/bluez5/out-of-tree.patch
>>
>> So I imagine you're using an old release of Yocto.  I sent this patch to the
>> linux-bluetooth list in April 2016 but it was either moderated away or
>> missed.
>>
>> Ross