[yocto] Building BlueZ from git in Yocto

[Burton, Ross]

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
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