linux-kernel - Re: [PATCH v2 0/8] perf build: Support building with Clang

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Message-ID: <CAP-5=fUdk-EEDz2p__UJAcmkO=bA143dOUpGRcnW7_5FhZT71Q@mail.gmail.com>
Date: Tue, 30 Sep 2025 11:14:30 -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>, Nathan Chancellor <nathan@...nel.org>, 
	Nick Desaulniers <nick.desaulniers+lkml@...il.com>, Bill Wendling <morbo@...gle.com>, 
	Justin Stitt <justinstitt@...gle.com>, Paul Walmsley <paul.walmsley@...ive.com>, 
	Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
	Alexandre Ghiti <alex@...ti.fr>, James Clark <james.clark@...aro.org>, linux-kernel@...r.kernel.org, 
	linux-perf-users@...r.kernel.org, llvm@...ts.linux.dev, 
	linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v2 0/8] perf build: Support building with Clang

On Tue, Sep 30, 2025 at 9:55 AM Leo Yan <leo.yan@....com> wrote:
>
> This series adds support for building perf with Clang, following the
> discussion in [1]. Because the Android NDK uses Clang by default,
> enabling Clang builds naturally covers Android as well.
>
> The series is organized as follows:
>
>   - Patches 1–2: Fix two bugs found with Clang.
>   - Patches 3–6: Correct CROSS_ARCH and dismiss Clang build warnings.
>   - Patches 7–8: Enable Clang in the Makefile and update the
>     documentation.
>
> Testing:
>
>   - Clang 15.0.7 on Ubuntu 22.04.5: native and cross-compiling (aarch64)
>   - Clang 18.1.3 on Ubuntu 24.04.2: native and cross-compiling (aarch64)
>   - Android NDK r27d (latest LTS): cross-compiling (aarch64)
>
> [1] https://lore.kernel.org/linux-perf-users/20240715143342.52236-1-leo.yan@arm.com/
>
> ---
> Changes in v2:
> - Dropped the patch for dismissing warning in bpftool.
> - Refined the document. (Ian)
> - Link to v1: https://lore.kernel.org/r/20250925-perf_build_android_ndk-v1-0-8b35aadde3dc@arm.com

Reviewed-by: Ian Rogers <irogers@...gle.com>

Thanks,
Ian

> ---
> Leo Yan (8):
>       tools build: Align warning options with perf
>       perf python: split Clang options when invoking Popen
>       perf: build: Correct CROSS_ARCH for clang
>       perf test coresight: Dismiss clang warning for memcpy thread
>       perf test coresight: Dismiss clang warning for thread loop
>       perf test coresight: Dismiss clang warning for unroll loop thread
>       perf build: Support build with clang
>       perf docs: Document building with Clang
>
>  tools/build/feature/Makefile                       |  6 +-
>  tools/perf/Documentation/Build.txt                 | 15 ++++
>  tools/perf/Documentation/android.txt               | 80 ++--------------------
>  tools/perf/Makefile.config                         | 32 ++++++++-
>  tools/perf/Makefile.perf                           |  2 +-
>  .../shell/coresight/memcpy_thread/memcpy_thread.c  |  2 +
>  .../shell/coresight/thread_loop/thread_loop.c      |  4 +-
>  .../unroll_loop_thread/unroll_loop_thread.c        |  4 +-
>  tools/perf/util/setup.py                           |  5 +-
>  9 files changed, 67 insertions(+), 83 deletions(-)
> ---
> base-commit: c17dda8013495d8132c976cbf349be9949d0fbd1
> change-id: 20250915-perf_build_android_ndk-500b53bea895
>
> Best regards,
> --
> Leo Yan <leo.yan@....com>
>