linux-kernel - Re: [PATCH v3 0/9] perf build: Support building with Clang

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Message-ID: <aOQdcvW6jURCV8pF@x1>
Date: Mon, 6 Oct 2025 16:50:10 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Leo Yan <leo.yan@....com>
Cc: 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>, linux-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org, llvm@...ts.linux.dev,
	linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v3 0/9] perf build: Support building with Clang

On Mon, Oct 06, 2025 at 05:21:22PM +0100, Leo Yan 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 3~7: Correct CROSS_ARCH, Disable thread safety analysis for
>                  perl header, and dismiss Clang build warnings.
>   - Patches 8~9: Enable Clang in the Makefile and update the
>                  documentation.
> 
> Testing:
> 
> Tested with linux-tools-container-builds [2], which based on Arnaldo's
> build test container but with several fixes for cross building with
> Clang:
> 
>   - All clang native builds on x86_64 have passed.
>   - The cross builds for arm64/mips/mips64/mipsel/riscv64 have passed.
> 
> Only a pity thing is I cannot build successfully with clang for
> ubuntu:20.04-x-powerpc64el (in below log, it only builds with GCC).
> The cross config does not work well on Ubuntu 20.04 due to failure
> "No gnu/libc-version.h found, please install glibc-dev[el]". I confirmed
> that powerpc64el cross build can make success on Ubuntu 24.04, the
> failure on Ubuntu 20.04 should not be caused by perf build.

Thaanks, applied, testing it.

- Arnaldo