[OE-core] [PATCH 8/8] linux-yocto-dev: update to v4.15+

[Bruce Ashfield]

On 2017-12-04 12:39 PM, Richard Purdie wrote:
> On Mon, 2017-12-04 at 12:24 -0500, Bruce Ashfield wrote:
>> On 2017-12-04 11:38 AM, Khem Raj wrote:
>>>
>>> On Mon, Dec 4, 2017 at 7:39 AM, Bruce Ashfield
>>> <bruce.ashfield at windriver.com> wrote:
>>>>
>>>> Outside of the normal patch refreshes and boot issues, there are
>>>> new
>>>> build time tools within the kernel that required the following
>>>> dependencies:
>>>>
>>>> For ORC_UNWINDER support in x86-64:
>>>>
>>>>    DEPENDS += "${@bb.utils.contains('ARCH', 'x86', 'elfutils-
>>>> native elfutils', '', d)}"
>>> do we need both target and host elfutils
>> Yup. There were references to both. Some had to run for hostcc
>> and others in the target arch.
> 
> Just for reference this is pretty bad for performance as it delays the
> kernel compile until some substantial parts of userspace build.
> 

On a second look, I can likely turn off the target part, if someone
wants it, they can always install the package (or it could be a
rdepends).

I'll amend the commit and leave it on that branch with just the
DEPENDS on the -native version.

> Is ORC_UNWINDER useful and commonly used?

The upstream kernel commit turned it on by default, I turned it off in
the kernel-cache, but I wanted to make sure the dependency was
in place.

The commit series from Josh Poimboeuf all lead to it being on as
the default choice (even with a slight overhead).

Bruce

> 
> Cheers,
> 
> Richard
>