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

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Message-Id: <20250930-perf_build_android_ndk-v2-0-2ea440b7ef01@arm.com>
Date: Tue, 30 Sep 2025 17:54:48 +0100
From: Leo Yan <leo.yan@....com>
To: Arnaldo Carvalho de Melo <acme@...nel.org>, 
 Namhyung Kim <namhyung@...nel.org>, Jiri Olsa <jolsa@...nel.org>, 
 Ian Rogers <irogers@...gle.com>, 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>
Cc: linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org, 
 llvm@...ts.linux.dev, linux-riscv@...ts.infradead.org, 
 Leo Yan <leo.yan@....com>
Subject: [PATCH v2 0/8] perf build: Support building with Clang

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

---
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>