linux-kernel - Re: [PATCH v2] perf docs: Mark the Android document as obsolete

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Message-ID: <CAP-5=fVvg=5SE29_SUW0MWmLADL477vpP2DBid2kKZ8kNqxXiA@mail.gmail.com>
Date: Tue, 16 Jul 2024 08:05:15 -0700
From: Ian Rogers <irogers@...gle.com>
To: Leo Yan <leo.yan@....com>, llvm@...ts.linux.dev
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, Jiri Olsa <jolsa@...nel.org>, 
	Adrian Hunter <adrian.hunter@...el.com>, "Liang, Kan" <kan.liang@...ux.intel.com>, 
	Nathan Chancellor <nathan@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>, 
	Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>, 
	James Clark <james.clark@...aro.org>, linux-perf-users@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] perf docs: Mark the Android document as obsolete

On Tue, Jul 16, 2024 at 6:49 AM Leo Yan <leo.yan@....com> wrote:
>
>
> On 7/16/24 14:30, Ian Rogers wrote:
> > On Tue, Jul 16, 2024 at 3:06 AM Leo Yan <leo.yan@....com> wrote:
>
> [...]
>
> >> Thanks for correcting. Now I even can build successfully with the Clang
> >> from Android NDK with an additional flag 'NO_DEMANGLE=1'. Though we still
> >> need to disable several modules for passing the building, but we are on the
> >> right way.
> >>
> >> Would you like to continue a formal fixing or you want me to follow up?
> >
> > +clang-built-linux
> >
> > If you could follow up it would be great!
>
> Okay, I will look into it.
>
> > I'm not sure how we detect
> > in the build that we're using clang, I suspect there is an approach in
> > a different kernel Makefile/Build that already tackles this but my
> > quick searching didn't yield anything - perhaps the change would be
> > better suited to the location the CROSS_COMPILE prefix is added to
> > gcc.
>
> Should we follow up the steps in the Documentation/kbuild/llvm.rst?
> The document uses the flag 'LLVM=1' for selecting LLVM/Clang.

Fix clang-built-linux email to llvm@...ts.linux.dev

I'm not sure as the kernel build and the tools build differ in certain
ways. Perhaps look at the selftests build to see what they do, as they
are under tools and share the build files.

Thanks,
Ian


> Thanks,
> Leo
>
> > The only thing the change to Makefile.config is doing is
> > injecting the --target option. I'm not sure anything more is not
> > working for me on my laptop with this approach compared to cross
> > compiling with gcc, but as you say going in the right direction is
> > worth it anyway.
> >
> > Thanks,
> > Ian