linux-kernel - Re: [PATCH v5 00/19] Support dynamic opening of capstone/llvm remove BUILD

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Message-ID: <CAP-5=fUa6xcn7j6_SGrmK7pTPTcUADodXo6o3UTLbFWBAeUUAg@mail.gmail.com>
Date: Sun, 24 Aug 2025 09:39:33 -0700
From: Ian Rogers <irogers@...gle.com>
To: Andi Kleen <ak@...ux.intel.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Adrian Hunter <adrian.hunter@...el.com>, Kan Liang <kan.liang@...ux.intel.com>, 
	Nathan Chancellor <nathan@...nel.org>, Nick Desaulniers <nick.desaulniers+lkml@...il.com>, 
	Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>, 
	Aditya Gupta <adityag@...ux.ibm.com>, "Steinar H. Gunderson" <sesse@...gle.com>, 
	Charlie Jenkins <charlie@...osinc.com>, Changbin Du <changbin.du@...wei.com>, 
	"Masami Hiramatsu (Google)" <mhiramat@...nel.org>, James Clark <james.clark@...aro.org>, 
	Kajol Jain <kjain@...ux.ibm.com>, Athira Rajeev <atrajeev@...ux.vnet.ibm.com>, 
	Li Huafei <lihuafei1@...wei.com>, Dmitry Vyukov <dvyukov@...gle.com>, 
	Chaitanya S Prakash <chaitanyas.prakash@....com>, linux-kernel@...r.kernel.org, 
	linux-perf-users@...r.kernel.org, llvm@...ts.linux.dev, 
	Song Liu <song@...nel.org>, bpf@...r.kernel.org
Subject: Re: [PATCH v5 00/19] Support dynamic opening of capstone/llvm remove BUILD_NONDISTRO

On Sat, Aug 23, 2025 at 4:34 PM Andi Kleen <ak@...ux.intel.com> wrote:
>
> > BUILD_NONDISTRO is used to build perf against the license incompatible
> > libbfd and libiberty libraries. As this has been opt-in for nearly 2
> > years, commit dd317df07207 ("perf build: Make binutil libraries opt
> > in"), remove the code to simplify the code base.
>
> The last time I tried the LLVM stuff was totally broken, couldn't
> resolve many things. The only workaround was to go back to the actually
> working libbfd. Please don't remove the only working option.

Andi, did you report a bug? Does the non-libbfd stuff work? Yes, as
every distribution has shipped it since binutils went to GPLv3 (in
2007?). While I don't want LLVM stuff not to work, bugs happen, libbfd
is license incompatible with GPLv2 and maintaining it in the source
tree is a burden. When something doesn't work, create a test to repeat
the issue and then we can make it work and ensure it doesn't break
again. In general I've not had issues with the LLVM code.

Thanks,
Ian