linux-kernel - Re: [PATCH v2] perf build: filter all combinations of -flto for libperl

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Message-Id: <174283407703.1817265.14283726401128648885.b4-ty@kernel.org>
Date: Mon, 24 Mar 2025 09:34:37 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
 Arnaldo Carvalho de Melo <acme@...nel.org>, 
 Mark Rutland <mark.rutland@....com>, 
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>, 
 Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>, 
 Adrian Hunter <adrian.hunter@...el.com>, 
 "Liang, Kan" <kan.liang@...ux.intel.com>, linux-perf-users@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 Holger Hoffstätte <holger@...lied-asynchrony.com>
Subject: Re: [PATCH v2] perf build: filter all combinations of -flto for
 libperl

On Fri, 21 Mar 2025 09:20:39 +0100, Holger Hoffstätte wrote:
> When enabling the libperl feature the build uses perl's build flags
> (ccopts) but filters out various flags, e.g. for LTO.
> While this is conceptually correct, it is insufficient in practice,
> since only "-flto=auto" is filtered out. When perl itself is built with
> "-flto" this can cause parts of perf being built with LTO and others
> without, giving exciting build errors like e.g.:
> 
> [...]
Applied to perf-tools-next, thanks!

Best regards,
Namhyung