[OE-core] [PATCH] perf: fail if src path does not exist

[Mikko.Rapeli at bmw.de]

Martin Jansa wrote:
> I think this will break support for older kernels added in:
> http://git.openembedded.org/openembedded-core/commit/?id=19fb2d11a8bb3c6dfdd5edc1b9155d642dc0f5e0
> 
> kernel-source/tools/arch and kernel-source/tools/build are missing in 3.16
> kernel even when it's not completely broken.
> 
> I'm not completely against this change, maybe just add to commit message
> that for older kernels you need to add .bbappend which removes the
> directories which really doesn't exist in your kernel version from PERF_SRC.

Exactly. For older kernels like 4.1 the recipe did not work at all and the
failure was a total one at compile time. Once error was clear, solution
was to create a perf.bbappend for the kernel which overwrites
the PERF_SRC variable with needed directories from kernel source tree.

I can document this in the commit message and send a v2.

-Mikko