linux-kernel - Re: [PATCH v1] perf symbol-elf: Avoid a weak cxx_demangle

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Message-ID: <Z4A7uhizNDptyxNE@x1>
Date: Thu, 9 Jan 2025 18:12:26 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Kan Liang <kan.liang@...ux.intel.com>,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] perf symbol-elf: Avoid a weak cxx_demangle_sym
 function

On Thu, Jan 09, 2025 at 09:58:34AM -0800, Ian Rogers wrote:
> On Mon, Nov 18, 2024 at 7:17 PM Ian Rogers <irogers@...gle.com> wrote:
> >
> > cxx_demangle_sym is weak in case demangle-cxx.c replaces the
> > definition in symbol-elf.c. When demangle-cxx.c is built
> > HAVE_CXA_DEMANGLE_SUPPORT is defined, as such the define can be used
> > to avoid a weak symbol. As weak symbols are outside of the C standard
> > their use can lead to strange behaviors, in particular with LTO, as
> > well as causing issues to be hidden at link time.
> >
> > Signed-off-by: Ian Rogers <irogers@...gle.com>
> 
> Ping.

Thanks, applied to perf-tools-next,

- Arnaldo