ACK: [Artful/Xenial] Prevent linking perf command to libbfd

[Khaled Elmously]

On 2018-02-27 16:42:40 , Stefan Bader wrote:
> BugLink: https://bugs.launchpad.net/bugs/1748922
> 
> Impact: Linking perf (part of the linux-tools package) against libbfd
> prevents users to have linux-tools of different kernel versions installed
> in parallel. Which makes debugging hard.
> 
> Fix: As stated above this had been fixed before but upstream changes of
> the kernel between 3.2 and 4.4 voided those fixes. Unfortunately without
> causing build failures but causing libbfd to be used again. This has
> already been fixed up in Bionic. The first of the two patches needs a
> backport for Xenial to make up for a file rename. The second can be
> picked into both releases.
> 
> Testcase: Extracting ./usr/lib/linux-tools-*/perf from the generated
> linux-tools package and inspecting it with ldd. Old builds will have
> a reference to libbfd, the test builds did no longer.
> 
> Risk of regression: low (change of build option which has been done before
> and also for some time in Bionic).
> 
> -Stefan
> 
> 

Acked-by: Khalid Elmously <khalid.elmously at canonical.com>