[PATCH 0/8] perf build: Support building with Clang

[Leo Yan]

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: Address Clang build warnings. Because these warnings
    do not break the build, no Fixes tag is added to avoid backporting.
  - 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@xxxxxxx/

Signed-off-by: Leo Yan <leo.yan@xxxxxxx>
---
Leo Yan (8):
      tools build: Align warning options with perf
      perf python: split Clang options when invoking Popen
      bpftool: Conditionally add -Wformat-signedness flag
      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/bpf/bpftool/Makefile                         | 12 +++-
 tools/build/feature/Makefile                       |  4 +-
 tools/perf/Documentation/Build.txt                 | 18 +++++
 tools/perf/Documentation/android.txt               | 82 +++-------------------
 tools/perf/Makefile.config                         | 32 ++++++++-
 .../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, 81 insertions(+), 82 deletions(-)
---
base-commit: c17dda8013495d8132c976cbf349be9949d0fbd1
change-id: 20250915-perf_build_android_ndk-500b53bea895

Best regards,
-- 
Leo Yan <leo.yan@xxxxxxx>