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

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Message-ID: <CAP-5=fUGJmOr9XcsVWWCREjr1A7rUFaMk0VPkQAKDAEjTLKJVQ@mail.gmail.com>
Date: Mon, 15 Jul 2024 12:44:46 -0700
From: Ian Rogers <irogers@...gle.com>
To: Leo Yan <leo.yan@....com>
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 Mon, Jul 15, 2024 at 12:31 PM Leo Yan <leo.yan@....com> wrote:
>
>
> Hi Ian,
>
> On 7/15/24 18:17, Ian Rogers wrote:
> > On Mon, Jul 15, 2024 at 7:34 AM Leo Yan <leo.yan@....com> wrote:
> > [snip]
> >> +Android NDK compilation is deprecated and no longer supported.
> >
> > I think this is objectively worse than just removing the file. It is
> > likely the perf tool can build with clang/LLVM, I do it every day
>
> Just curious, are you using LLVM/clang for cross building (e.g. build
> aarch64 target on x86_64 host) or just native building?
>
> Clang/LLVM is a natively cross-compiler [1], I installed Clang-15 in the
> offical package on Ubuntu, but I failed to do cross compilation with it:
>
>    make ARCH=arm64 LLVM=-15 VF=1 DEBUG=1 -C tools/perf

So we're cross-compiling in bazel, so it is a different set up than
the makefiles - I'm happy to work to share the bazel set up if other
people care. I'm having a play to see if I can get the Makefile
working, my first attempts are clearly mixing x86 code into the
supposedly arm64 build, which would appear to be more of a build
system rather than code problem.

Thanks,
Ian