From: sashiko-bot@kernel.org
To: "Ian Rogers" <irogers@google.com>
Cc: linux-perf-users@vger.kernel.org
Subject: Re: [PATCH 7/9] perf build: Check the version of the compiler that is used
Date: Wed, 16 Sep 2026 06:16:52 +0000 [thread overview]
Message-ID: <20260916061652.B1D121F0089A@smtp.kernel.org> (raw)
In-Reply-To: <20260916061218.3061216-8-irogers@google.com>
> The flex and bison flags are adjusted for clang older than 13.0.0, which
> doesn't grok -Wno-unused-but-set-variable. The test is reached because
> CC_NO_CLANG says CC is clang, but the version comes from $(CLANG), which
> defaults to plain "clang" and needn't be the compiler in use:
>
> $ make CC=clang-19 CLANG=clang-12
> version from $(CLANG) -> 12.0.0, flag stripped
> version from $(CC) -> 19.1.7, flag kept
>
> Dropping the flag lets the warnings it suppresses in the generated flex
> and bison code through, and those are errors under -Werror.
>
> Ask $(CC) instead, as that is what compiles the code.
>
> Fixes: 878460e8d0ff ("perf build: Remove -Wno-unused-but-set-variable from the flex flags when building with clang < 13.0.0")
> Signed-off-by: Ian Rogers <irogers@google.com>
Sashiko has reviewed this patch and found no issues. It looks great!
--
Sashiko AI review · https://sashiko.dev/#/patchset/20260916061218.3061216-1-irogers@google.com?part=7
next prev parent reply other threads:[~2026-09-16 6:16 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-16 6:12 [PATCH 0/9] perf build: Fix builds with clang and BUILD_NONDISTRO Ian Rogers
2026-09-16 6:12 ` [PATCH 1/9] perf libbfd: Fix the clang -Wthread-safety build failure Ian Rogers
2026-09-16 6:18 ` sashiko-bot
2026-09-16 6:12 ` [PATCH 2/9] perf symbol: Fix the build when demangling with libbfd Ian Rogers
2026-09-16 6:21 ` sashiko-bot
2026-09-16 6:12 ` [PATCH 3/9] perf libbfd: Include the headers that are used Ian Rogers
2026-09-16 6:22 ` sashiko-bot
2026-09-16 15:54 ` Ian Rogers
2026-09-16 17:37 ` Namhyung Kim
2026-09-16 6:12 ` [PATCH 4/9] perf pmu: " Ian Rogers
2026-09-16 6:14 ` sashiko-bot
2026-09-16 6:12 ` [PATCH 5/9] perf build: Only pass clang flags to CXX when CXX is clang Ian Rogers
2026-09-16 6:17 ` sashiko-bot
2026-09-16 6:12 ` [PATCH 6/9] perf build: Use the given CC rather than clang in clang builds Ian Rogers
2026-09-16 6:19 ` sashiko-bot
2026-09-16 6:12 ` [PATCH 7/9] perf build: Check the version of the compiler that is used Ian Rogers
2026-09-16 6:16 ` sashiko-bot [this message]
2026-09-16 6:12 ` [PATCH 8/9] perf build: Remove leftovers of removed build options Ian Rogers
2026-09-16 6:17 ` sashiko-bot
2026-09-16 6:12 ` [PATCH 9/9] perf test: Add build tests for clang and libbfd demangling Ian Rogers
2026-09-16 6:22 ` sashiko-bot
2026-09-16 17:35 ` [PATCH 0/9] perf build: Fix builds with clang and BUILD_NONDISTRO Namhyung Kim
2026-09-22 12:47 ` Arnaldo Carvalho de Melo
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