Re: [Buildroot] [PATCH v2 1/2] package/linux-tools: perf: add explicit option for libbfd support

[Sergey Matyukevich <geomatsi@gmail.com>]

Hi all,

> Before Linux v6.4, libbfd support in perf was opted in by default and
> could be disabled using NO_LIBBFD=1. Starting from Linux v6.4, libbfd
> support in perf is opted out by default and can be enabled with new
> variable BUILD_NONDISTRO=1. For details see the kernel commit [1].
> 
> Linking perf against libbfd library may significantly speed up perf
> report and script commands for data recorded with call-graph information
> based on DWARF format. Without libbfd perf executes a new addr2line
> process for every address it needs to look up. However perf linked
> against libbfd may become undistributable since perf is licenced
> under GPLv2 and binutils libraries are licenced under GPLv3+.
> For more detais see Debian bug report [2].
> 
> This commit adds a new BR2_PACKAGE_LINUX_TOOLS_PERF_LIBBFD option to
> perf to explicitly enable libbfd support when appropriate. Note that
> enabling binutils in the configuration does not implicitly enable libbfd
> support for perf anymore. Also note that if the new option is not
> enabled in the configuration, then the legacy NO_DEMANGLE and NO_LIBBFD
> options will be set for perf in order to explicitly disable libbfd
> support in pre-v6.4 Linux kernels.
> 
> [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=dd317df072071903031ab5f91b4823858445c4a0
> [2] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=911815
> 
> Signed-off-by: Sergey Matyukevich <geomatsi@gmail.com>
> ---
>  package/linux-tools/Config.in             | 10 ++++++++++
>  package/linux-tools/linux-tool-perf.mk.in | 15 +++++++++------
>  2 files changed, 19 insertions(+), 6 deletions(-)

Friendly ping. Any thoughs or comments regarding this one ?

Regards,
Sergey
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