[Buildroot] [PATCH 4/7] package/perf: build outside kernel tree

[Arnout Vandecappelle <arnout@mind.be>]

On 18/03/15 22:43, Steven Noonan wrote:
> This is necessary for introducing patches.

 Although I think it's really messy to build perf within the the linux source
like we do now, your proposed approach has some showstopper drawbacks.

- It doesn't work for LINUX_OVERRIDE_SRCDIR or BR2_LINUX_KERNEL_CUSTOM_LOCAL.

- Any custom patches to the kernel are not taken into account, and I believe
perf uses the private headers so there's a risk there.

- It requires an expensive second extract of the entire kernel.


 As an alternative, you could copy in just the perf stuff from the linux source
as a POST_EXTRACT_HOOK.

 Or you could apply the patches on the kernel sources instead of on the perf
directory. But that would be a bit more complicated.

 Or you could add a LINUX_POST_PATCH_HOOK to apply the perf patches. I'm not
entirely sure if that would work though.


 Regards,
 Arnout

-- 
Arnout Vandecappelle                          arnout at mind be
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